Components:
Treatment option:
Medically reviewed by Militian Inessa Mesropovna, PharmD. Last updated on 05.04.2022
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Hormone replacement therapy (HRT) for oestrogen deficiency symptoms in postmenopausal women at least 6 months since last menses.
Prevention of osteoporosis in postmenopausal women at high risk of future fractures who are intolerant of, or contraindicated for, other medicinal products approved for the prevention of osteoporosis. ()
The experience in treating women older than 65 years is limited.
Femoston 1/5 and Femoston 2/10, are continuous sequential hormone replacement therapies.
) should be used.
In general, treatment should start with Femoston 1/5. Depending on the clinical response, the dosage can afterwards be adjusted to individual need. If the complaints linked to oestrogen deficiency are not ameliorated the dosage can be increased by using Femoston 2/10
Starting Femoston
In women who are not taking hormone replacement therapy and who are amenorrhoeic, or women who switch from a continuous combined hormone replacement therapy, treatment may be started on any convenient day. In women transferring from a cyclic or continuous sequential HRT regimen, treatment should begin the day following completion of the prior regimen.
Administration
For the first 14 days during a 28-cycle, one tablet containing oestradiol is taken daily; during the following 14 days one tablet containing oestradiol and dydrogesterone is taken.
After a cycle of 28 days, on the 29th day, a new 28-day cycle begins. This means that the treatment should be taken continuously without a break between packs. Femoston can be taken with or without food.
The days of the week are printed on the back of the blister strips. Firstly, the tablets from the part marked with arrow 1 should be taken, then all the tablets from the part marked with arrow 2 should be taken.
If a dose has been forgotten, it should be taken as soon as possible. When more than 12 hours have elapsed, it is recommended to continue with the next dose without taking the forgotten tablet. The likelihood of breakthrough bleeding or spotting may be increased.
Paediatric population:
There is no relevant indication for the use of Femoston in the paediatric population.
Femoston 1/10 and Femoston 1/5, are continuous sequential hormone replacement therapies.
) should be used.
In general, treatment should start with Femoston 1/10. Depending on the clinical response, the dosage can afterwards be adjusted to individual need. If the complaints linked to oestrogen deficiency are not ameliorated the dosage can be increased by using Femoston 1/5
Starting Femoston
In women who are not taking hormone replacement therapy and who are amenorrhoeic, or women who switch from a continuous combined hormone replacement therapy, treatment may be started on any convenient day. In women transferring from a cyclic or continuous sequential HRT regimen, treatment should begin the day following completion of the prior regimen.
Administration
For the first 14 days during a 28-cycle, one tablet containing oestradiol is taken daily; during the following 14 days one tablet containing oestradiol and dydrogesterone is taken.
After a cycle of 28 days, on the 29th day, a new 28-day cycle begins. This means that the treatment should be taken continuously without a break between packs. Femoston can be taken with or without food.
The days of the week are printed on the back of the blister strips. Firstly, the tablets from the part marked with arrow 1 should be taken, then all the tablets from the part marked with arrow 2 should be taken.
If a dose has been forgotten, it should be taken as soon as possible. When more than 12 hours have elapsed, it is recommended to continue with the next dose without taking the forgotten tablet. The likelihood of breakthrough bleeding or spotting may be increased.
Paediatric population:
There is no relevant indication for the use of Femoston in the paediatric population.
- Known, past or suspected breast cancer;
- Known or suspected oestrogen-dependent malignant tumours (e.g. endometrial cancer);
- Known or suspected progestogen-dependent neoplasms (e.g. meningioma)
- Undiagnosed genital bleeding;
- Untreated endometrial hyperplasia;
- Previous idiopathic or current venous thromboembolism (deep vein thrombosis, pulmonary embolism);
- Known thrombophilic disorders ;
- Active or recent arterial thromboembolic disease (e.g. angina, myocardial infarction);
- Acute liver disease or a history of liver disease as long as liver function tests have failed to return to normal;
- Porphyria;
- Known hypersensitivity to the active substances or to any of the excipients.
For the treatment of postmenopausal symptoms, HRT should only be initiated for symptoms that adversely affect quality of life. In all cases, a careful appraisal of the risks and benefits should be undertaken at least annually and HRT should only be continued as long as the benefit outweighs the risk.
Evidence regarding the risks associated with HRT in the treatment of premature menopause is limited. Due to the low level of absolute risk in younger women, however, the balance of benefits and risks for these women may be more favourable than in older women.
Medical examination/follow up
Before initiating or reinstituting HRT, a complete personal and family medical history should be taken. Physical (including pelvic and breast) examination should be guided by this and by the contraindications and warnings for use. During treatment, periodic check-ups are recommended of a frequency and nature adapted to the individual woman. Women should be advised what changes in their breasts should be reported to their doctor or nurse (see 'Breast cancer' below). Investigations, including appropriate imaging tools, e.g. mammography, should be carried out in accordance with currently accepted screening practices, modified to the clinical needs of the individual.
Conditions which need supervision
If any of the following conditions are present, have occurred previously, and/or have been aggravated during pregnancy or previous hormone treatment, the patient should be closely supervised. It should be taken into account that these conditions may recur or be aggravated during treatment with Femoston, in particular:
- Leiomyoma (uterine fibroids) or endometriosis
- Risk factors for thromboembolic disorders (see below)
- Risk factors for oestrogen dependent tumours, e.g. 1st degree heredity for breast cancer
- Hypertension
- Liver disorders (e.g. liver adenoma)
- Diabetes mellitus with or without vascular involvement
- Cholelithiasis
- Migraine or (severe) headache
- Systemic lupus erythematosus
- A history of endometrial hyperplasia (see below)
- Epilepsy
- Asthma
- Otosclerosis
Reasons for immediate withdrawal of therapy:
Therapy should be discontinued in cases where a contra-indication is discovered and in the following situations:
- Jaundice or deterioration in liver function
- Significant increase in blood pressure
- New onset of migraine-type headache
- Pregnancy
Endometrial hyperplasia and carcinoma
In women with an intact uterus the risk of endometrial hyperplasia and carcinoma is increased when oestrogens are administered alone for prolonged periods. The reported increase in endometrial cancer risk among oestrogen-only users varies from 2- to 12-fold greater compared with non-users, depending on the duration of treatment and oestrogen dose. After stopping treatment risk may remain elevated for at least 10 years.
The addition of a progestagen cyclically for at least 12 days per month/28 day cycle or continuous combined oestrogen-progestagen therapy in non-hysterectomised women prevents the excess risk associated with oestrogen-only HRT.
Break-through bleeding and spotting may occur during the first months of treatment. If break-through bleeding or spotting appears after some time on therapy, or continues after treatment has been discontinued, the reason should be investigated, which may include endometrial biopsy to exclude endometrial malignancy.
Breast cancer
The overall evidence suggests an increased risk of breast cancer in women taking combined oestrogen-progestagen and possibly also oestrogen-only HRT, that is dependent on the duration of taking HRT.
Combined oestrogen-progestogen therapy
The randomised placebo-controlled trial, the Womens Health Initiative study (WHI) and epidemiological studies are consistent in finding an increased risk of breast cancer in women taking combined oestrogen-progestagen for HRT that becomes apparent after about 3 years.The excess risk becomes apparent within a few years of use but returns to baseline within a few (at most five) years after stopping treatment.
HRT, especially oestrogen-progestagen combined treatment, increases the density of mammographic images which may adversely affect the radiological detection of breast cancer.
Oestrogen-only therapy
The WHI trial found no increase in the risk of breast cancer in hysterectomised women using oestrogen-only HRT. Observational studies have mostly reported a small increase in risk of having breast cancer diagnosed that is substantially lower than that found in users of oestrogen-progestogen combinations.
The excess risk becomes apparent within a few years of use but returns to baseline within a few (at most five) years after stopping treatment.
HRT, especially oestrogen-progestogen combined treatment, increases the density of mammographic images which may adversely affect the radiological detection of breast cancer.
Ovarian cancer
Ovarian cancer is much rarer than breast cancer. Epidemiological evidence from a large meta-analysis suggests a slightly increased risk in women taking oestrogen-only or combined oestrogen-progestagen HRT, which becomes apparent within 5 years of use and diminishes over time after stopping. Some other studies including the WHI trial suggest that use of combined HRTs may be associated with a similar or slightly smaller risk.
Venous thromboembolism
- HRT is associated with a 1.3-3 fold risk of developing venous thromboembolism (VTE), i.e. deep vein thrombosis or pulmonary embolism. The occurrence of such an event is more likely in the first year of HRT than later.
- Patients with known thrombophilic states have an increased risk of VTE and HRT may add to this risk. HRT is therefore contraindicated in these patients
- Generally recognised risk factors for VTE include, use of oestrogens, older ages, major surgery, prolonged immobilisation, severe obesity (BMI>30 kg/m2), pregnancy/postpartum period, systemic lupus erythematosus (SLE), and cancer. There is no consensus about the possible role of varicose veins in VTE.
As in all postoperative patients, prophylactic measures need to be considered to prevent VTE following surgery. If prolonged immobilisation is to follow elective surgery temporarily stopping HRT 4 to 6 weeks earlier is recommended. Treatment should not be restarted until the woman is completely mobilised.
- In women with no personal history of VTE but with a first degree relative with a history of thrombosis at young age, screening may be offered after careful counselling regarding its limitations (only a proportion of thrombophilic defects are identified by screening).If a thrombophilic defect is identified which segregates with thrombosis in family members or if the defect is 'severe' (e.g. antithrombin, protein S, or protein C deficiencies or a combination of defects) HRT is contraindicated.
- Women already on chronic anticoagulant treatment require careful consideration of the benefit-risk use of HRT.
- If VTE develops after initiating therapy, the drug should be discontinued. Patients should be told to contact their doctors immediately when they are aware of a potential thromboembolic symptom (e.g. painful swelling of a leg, sudden pain in the chest, dyspnoea).
Coronary artery disease (CAD)
There is no evidence from randomised controlled trials of protection against myocardial infarction in women with or without existing CAD who received combined oestrogen-progestagen or oestrogen-only HRT.
Combined oestrogen-progestagen therapy
The relative risk of CAD during use of combined oestrogen+progestagen HRT is slightly increased. As the baseline absolute risk of CAD is strongly dependent on age, the number of extra cases of CAD due to oestrogen+progestagen use is very low in healthy women close to menopause, but will rise with more advanced age.
Oestrogen-only
Randomised controlled data found no increased risk of CAD in hysterectomised women using oestrogen-only therapy.
Ischaemic stroke
Combined oestrogen-progestagen and oestrogen-only therapy are associated with an up to 1.5-fold increase in risk of ischaemic stroke. The relative risk does not change with age or time since menopause. However, as the baseline risk of stroke is strongly age-dependent, the overall risk of stroke in women who use HRT will increase with age.
Other conditions
- Oestrogens may cause fluid retention, and therefore patients with cardiac or renal dysfunction should be carefully observed. Women with pre-existing hypertriglyceridemia should be followed closely during oestrogen replacement or hormone replacement therapy, since rare cases of large increases of plasma triglycerides leading to pancreatitis have been reported with oestrogen therapy in this condition.
- Oestrogens increase thyroid binding globulin (TBG), leading to increased circulating total thyroid hormone, as measured by protein-bound iodine (PBI), T4 levels (by column or by radio-immunoassay) or T3 levels (by radio-immunoassay). T3 resin uptake is decreased, reflecting the elevated TBG. Free T4 and free T3 concentrations are unaltered. Other binding proteins may be elevated in serum, i.e. corticoid binding globulin (CBG), sex- hormone-binding globulin (SHBG) leading to increased circulating corticosteroids and sex steroids, respectively. Free or biological active hormone concentrations are unchanged. Other plasma proteins may be increased (angiotensinogen/renin substrate, alpha-1-antitrypsin, ceruloplasmin).
- HRT use does not improve cognitive function. There is some evidence of increased risk of possible dementia in women who start using continuous combined or oestrogen-only HRT after the age of 65.
- Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicine.
- Women who may be at risk of pregnancy should be advised to adhere to non-hormonal contraceptive methods.
For the treatment of postmenopausal symptoms, HRT should only be initiated for symptoms that adversely affect quality of life. In all cases, a careful appraisal of the risks and benefits should be undertaken at least annually and HRT should only be continued as long as the benefit outweighs the risk.
Evidence regarding the risks associated with HRT in the treatment of premature menopause is limited. Due to the low level of absolute risk in younger women, however, the balance of benefits and risks for these women may be more favourable than in older women.
Medical examination/follow up
Before initiating or reinstituting HRT, a complete personal and family medical history should be taken. Physical (including pelvic and breast) examination should be guided by this and by the contraindications and warnings for use. During treatment, periodic check-ups are recommended of a frequency and nature adapted to the individual woman. Women should be advised what changes in their breasts should be reported to their doctor or nurse (see 'Breast cancer' below). Investigations, including appropriate imaging tools, e.g. mammography, should be carried out in accordance with currently accepted screening practices, modified to the clinical needs of the individual.
Conditions which need supervision
If any of the following conditions are present, have occurred previously, and/or have been aggravated during pregnancy or previous hormone treatment, the patient should be closely supervised. It should be taken into account that these conditions may recur or be aggravated during treatment with Femoston, in particular:
- Leiomyoma (uterine fibroids) or endometriosis
- Risk factors for thromboembolic disorders (see below)
- Risk factors for oestrogen dependent tumours, e.g. 1st degree heredity for breast cancer
- Hypertension
- Liver disorders (e.g. liver adenoma)
- Diabetes mellitus with or without vascular involvement
- Cholelithiasis
- Migraine or (severe) headache
- Systemic lupus erythematosus
- A history of endometrial hyperplasia (see below)
- Epilepsy
- Asthma
- Otosclerosis
Reasons for immediate withdrawal of therapy:
Therapy should be discontinued in cases where a contra-indication is discovered and in the following situations:
- Jaundice or deterioration in liver function
- Significant increase in blood pressure
- New onset of migraine-type headache
- Pregnancy
Endometrial hyperplasia and carcinoma
In women with an intact uterus the risk of endometrial hyperplasia and carcinoma is increased when oestrogens are administered alone for prolonged periods. The reported increase in endometrial cancer risk among oestrogen-only users varies from 2- to 12-fold greater compared with non-users, depending on the duration of treatment and oestrogen dose. After stopping treatment risk may remain elevated for at least 10 years.
The addition of a progestogen cyclically for at least 12 days per month/28 day cycle or continuous combined oestrogen-progestogen therapy in non-hysterectomised women prevents the excess risk associated with oestrogen-only HRT.
Break-through bleeding and spotting may occur during the first months of treatment. If break-through bleeding or spotting appears after some time on therapy, or continues after treatment has been discontinued, the reason should be investigated, which may include endometrial biopsy to exclude endometrial malignancy.
Breast cancer
The overall evidence suggests an increased risk of breast cancer in women taking combined oestrogen-progestogen and possibly also oestrogen-only HRT, that is dependent on the duration of taking HRT.
Combined oestrogen-progestogen therapy
The randomised placebo-controlled trial, the Womens Health Initiative study (WHI) and epidemiological studies are consistent in finding an increased risk of breast cancer in women taking combined oestrogen-progestogen for HRT that becomes apparent after about 3 years.The excess risk becomes apparent within a few years of use but returns to baseline within a few (at most five) years after stopping treatment.
HRT, especially oestrogen-progestogen combined treatment, increases the density of mammographic images which may adversely affect the radiological detection of breast cancer.
Oestrogen-only therapy
The WHI trial found no increase in the risk of breast cancer in hysterectomised women using oestrogen-only HRT. Observational studies have mostly reported a small increase in risk of having breast cancer diagnosed that is substantially lower than that found in users of oestrogen-progestogen combinations.
The excess risk becomes apparent within a few years of use but returns to baseline within a few (at most five) years after stopping treatment.
HRT, especially oestrogen-progestogen combined treatment, increases the density of mammographic images which may adversely affect the radiological detection of breast cancer.
Ovarian cancer
Ovarian cancer is much rarer than breast cancer. Epidemiological evidence from a large meta-analysis suggests a slightly increased risk in women taking oestrogen-only or combined oestrogen-progestagen HRT, which becomes apparent within 5 years of use and diminishes over time after stopping. Some other studies including the WHI trial suggest that use of combined HRTs may be associated with a similar, or slightly smaller, risk.
Venous thromboembolism
- HRT is associated with a 1.3-3 fold risk of developing venous thromboembolism (VTE), i.e. deep vein thrombosis or pulmonary embolism. The occurrence of such an event is more likely in the first year of HRT than later.
- Patients with known thrombophilic states have an increased risk of VTE and HRT may add to this risk. HRT is therefore contraindicated in these patients
- Generally recognised risk factors for VTE include, use of oestrogens, older ages, major surgery, prolonged immobilisation, severe obesity (BMI>30 kg/m2), pregnancy/postpartum period, systemic lupus erythematosus (SLE), and cancer. There is no consensus about the possible role of varicose veins in VTE.
As in all postoperative patients, prophylactic measures need to be considered to prevent VTE following surgery. If prolonged immobilisation is to follow elective surgery temporarily stopping HRT 4 to 6 weeks earlier is recommended. Treatment should not be restarted until the woman is completely mobilised.
- In women with no personal history of VTE but with a first degree relative with a history of thrombosis at young age, screening may be offered after careful counselling regarding its limitations (only a proportion of thrombophilic defects are identified by screening).If a thrombophilic defect is identified which segregates with thrombosis in family members or if the defect is 'severe' (e.g. antithrombin, protein S, or protein C deficiencies or a combination of defects) HRT is contraindicated.
- Women already on chronic anticoagulant treatment require careful consideration of the benefit-risk use of HRT.
- If VTE develops after initiating therapy, the drug should be discontinued. Patients should be told to contact their doctors immediately when they are aware of a potential thromboembolic symptom (e.g. painful swelling of a leg, sudden pain in the chest, dyspnoea).
Coronary artery disease (CAD)
There is no evidence from randomised controlled trials of protection against myocardial infarction in women with or without existing CAD who received combined oestrogen-progestagen or oestrogen-only HRT.
Combined oestrogen-progestagen therapy
The relative risk of CAD during use of combined oestrogen+progestagen HRT is slightly increased. As the baseline absolute risk of CAD is strongly dependent on age, the number of extra cases of CAD due to oestrogen+progestagen use is very low in healthy women close to menopause, but will rise with more advanced age.
Oestrogen-only
Randomised controlled data found no increased risk of CAD in hysterectomised women using oestrogen-only therapy.
Ischaemic stroke
Combined oestrogen-progestagen and oestrogen-only therapy are associated with an up to 1.5-fold increase in risk of ischaemic stroke. The relative risk does not change with age or time since menopause. However, as the baseline risk of stroke is strongly age-dependent, the overall risk of stroke in women who use HRT will increase with age.
Other conditions
- Oestrogens may cause fluid retention, and therefore patients with cardiac or renal dysfunction should be carefully observed. Women with pre-existing hypertriglyceridemia should be followed closely during oestrogen replacement or hormone replacement therapy, since rare cases of large increases of plasma triglycerides leading to pancreatitis have been reported with oestrogen therapy in this condition.
- Oestrogens increase thyroid binding globulin (TBG), leading to increased circulating total thyroid hormone, as measured by protein-bound iodine (PBI), T4 levels (by column or by radio-immunoassay) or T3 levels (by radio-immunoassay). T3 resin uptake is decreased, reflecting the elevated TBG. Free T4 and free T3 concentrations are unaltered. Other binding proteins may be elevated in serum, i.e. corticoid binding globulin (CBG), sex- hormone-binding globulin (SHBG) leading to increased circulating corticosteroids and sex steroids, respectively. Free or biological active hormone concentrations are unchanged. Other plasma proteins may be increased (angiotensinogen/renin substrate, alpha-1-antitrypsin, ceruloplasmin).
- HRT use does not improve cognitive function. There is some evidence of increased risk of possible dementia in women who start using continuous combined or oestrogen-only HRT after the age of 65.
- Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicine.
- Women who may be at risk of pregnancy should be advised to adhere to non-hormonal contraceptive methods.
Femoston does not affect the ability to drive and use machines.
The most commonly reported adverse drug reactions of patients treated with oestradiol/dydrogesterone in clinical trials are headache, abdominal pain, breast pain/tenderness and back pain.
The following undesirable effects have been observed with the frequencies indicated below during clinical trials (n=4929):
| MedDRA system organ class | Very common >1/10 | Common >1/100, <1/10 | Uncommon >1/1,000, <1/100 | Rare >1/10,000, <1/1,000 |
| Infections and infestations | Vaginal candidiasis | Cystitis-like syndrome | ||
| Neoplasms benign, malignant and unspecified | Increase in size of leiomyoma | |||
| Immune system disorders | Hypersensitivity | |||
| Psychiatric disorders | Depression, Nervousness | Influence on libido | ||
| Nervous system disorders | Headache | Migraine, Dizziness | ||
| Cardiac disorders | Myocardial infarction | |||
| Vascular disorders | Hypertension, Peripheral vascular disease, Varicose vein, Venous thromboembolism | |||
| Gastrointestinal disorders | Abdominal pain | Nausea, Vomiting, Flatulence | Dyspepsia | |
| Hepatobiliary disorders | Abnormal hepatic function, occasionally with jaundice asthenia or malaise, and abdominal pain, Gall bladder disorder | |||
| Skin and subcutaneous tissue disorders | Allergic skin reactions (e.g. rash, urticaria, pruritus) | Angioedema, Vascular purpura | ||
| Musculoskeletal and connective tissue disorders | Back pain | |||
| Reproductive system and breast disorders | Breast pain/ tenderness | Menstrual disorders (including postmenopausal spotting, metrorrhagia, menorrhagia, oligo-/amenorrhoea, irregular menstruation, dysmenorrhoea), Pelvic pain, Cervical discharge | Breast enlargement, Premenstrual syndrome | |
| General disorders and administration site reactions | Asthenic conditions (asthenia, fatigue, malaise), Peripheral oedema | |||
| Investigations | Increased weight | Decreased weight |
Breast Cancer risk
- An up to 2-fold increased risk of having breast cancer diagnosed is reported in women taking combined oestrogen-progestagen therapy for more than 5 years.
- Any increased risk in users of oestrogen-only therapy is substantially lower than that seen in users of oestrogen-progestagen combinations.
- The level of risk is dependent on the duration of use.
- Results of the largest randomised placebo-controlled trial (WHI-study) and largest epidemiological study (MWS) are presented.
Million Women study- Estimated additional risk of breast cancer after 5 years' use
| Age range (years) | Additional cases per 1000 never-users of HRT over a 5 year period*1 | Risk ratio & 95%CI# | Additional cases per 1000 HRT users over 5 years (95%CI) |
| Oestrogen only HRT | |||
| 50-65 | 9-12 | 1.2 | 1-2 (0-3) |
| Combined oestrogen-progestagen | |||
| 50-65 | 9-12 | 1.7 | 6 (5-7) |
| #Overall risk ratio. The risk ratio is not constant but will increase with increasing duration on use Note: Since the background incidence of breast cancer differs by EU country, the number of additional cases of breast cancer will also change proportionately. | |||
1Taken from baseline incidence rates in developed countries
US WHI studies - additional risk of breast cancer after 5 years' use
| Age range (years) | Incidence per 1000 women in placebo arm over 5 years | Risk ratio & 95%CI | Additional cases per 1000 HRT users over 5 years (95%CI) |
| CEE oestrogen-only | |||
| 50-79 | 21 | 0.8 (0.7 - 1.0) | -4 (-6 - 0)*2 |
| CEE+MPA oestrogen & progestagen‡ | |||
| 50-79 | 17 | 1.2 (1.0 - 1.5) | +4 (0 - 9) |
2WHI study in women with no uterus, which did not show an increase in risk of breast cancer
‡When the analysis was restricted to women who had not used HRT prior to the study there was no increased risk apparent during the first 5 years of treatment: after 5 years the risk was higher than in non-users.
Endometrial cancer
Postmenopausal women with a uterus
The endometrial cancer risk is about 5 in every 1000 women with a uterus not using HRT.
In women with a uterus, use of oestrogen-only HRT is not recommended because it increases the risk of endometrial cancer. Depending on the duration of oestrogen-only use and oestrogen dose, the increase in risk of endometrial cancer in epidemiology studies varied from between 5 and 55 extra cases diagnosed in every 1000 between the ages of 50 and 65.
Adding a progestagen to oestrogen-only therapy for at least 12 days per cycle can prevent this increased risk. In the Million Women Study the use of five years of combined (sequential or continuous) HRT did not increase risk of endometrial cancer (R.R of 1.0 (0.8-1.2)).
Ovarian cancer
Use of oestrogen-only or combined oestrogen-progestagen HRT has been associated with a slightly increased risk of having ovarian cancer diagnosed.
A meta-analysis from 52 epidemiological studies reported an increased risk of ovarian cancer in women currently using HRT compared to women who have never used HRT (RR 1.43, 95% CI 1.31-1.56). For women aged 50 to 54 years taking 5 years of HRT, this results in about 1 extra case per 2000 users. In women aged 50 to 54 who are not taking HRT, about 2 women in 2000 will be diagnosed with ovarian cancer over a 5-year period.
Risk of venous thromboembolism
HRT is associated with a 1.3-3-fold increased relative risk of developing venous thromboembolism (VTE), i.e. deep vein thrombosis or pulmonary embolism. The occurrence of such an event is more likely in the first year of using HT. Results of the WHI studies are presented:
WHI Studies - Additional risk of VTE over 5 years' use
| Age range (years) | Incidence per 1000 women in placebo arm over 5 years | Risk ratio and 95%CI | Additional cases per 1000 HRT users |
| Oral oestrogen-only*3 | |||
| 50-59 | 7 | 1.2 (0.6-2.4) | 1 (-3 - 10) |
| Oral combined oestrogen-progestagen | |||
| 50-59 | 4 | 2.3 (1.2 - 4.3) | 5 (1 - 13) |
3Study in women with no uterus
Risk of coronary artery disease
- The risk of coronary artery disease is slightly increased in users of combined oestrogen-progestagen HRT over the age of 60.
Risk of ischaemic stroke
- The use of oestrogen-only and oestrogen + progestagen therapy is associated with an up to 1.5 fold increased relative risk of ischaemic stroke.
WHI studies combined - Additional risk of ischaemic stroke*4 over 5 years' use
| Age range (years) | Incidence per 1000 women in placebo arm over 5 years | Risk ratio and 95%CI | Additional cases per 1000 HRT users |
| 50-59 | 8 | 1.3 (1.1-1.6) | 3 (1-5) |
4No differentiation was made between ischaemic and haemorrhagic stroke
Other adverse reactions have been reported in association with oestrogen/progestogen treatment (including oestradiol/dydrogesterone):
Neoplasms benign, malignant and unspecified:
Oestrogen dependent neoplasms both benign and malignant, e.g. endometrial cancer, ovarian cancer. Increase in size of progestogen dependent neoplasms, e.g. meningioma.
Blood and lymphatic system disorders:
Haemolytic anaemia
Immune system disorders:
Systemic lupus erythematosus
Metabolism and nutrition disorders:
Hypertriglyceridemia
Nervous system disorders:
Probable dementia over the age of 65 , chorea, exacerbation of epilepsy
Eye disorders:
Steepening of corneal curvature, contact lenses intolerance
Vascular disorders:
Arterial thromboembolism
Gastrointestinal disorders:
Pancreatitis (in women with pre-existing hypertriglyceridemia)
Skin and subcutaneous tissue disorders:
Erythema multiforme, erythema nodosum, chloasma or melasma, which may persist when drug is discontinued.
Musculoskeletal and connective tissue disorders:
Leg cramps
Renal and urinary disorders:
Urinary incontinence
Reproductive system and breast disorders:
Fibrocystic breast disease, uterine cervical erosion
Congenital, familial and genetic disorders:
Aggravated porphyria
Investigations:
Total thyroid hormones increased
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard.
The most commonly reported adverse drug reactions of patients treated with oestradiol/dydrogesterone in clinical trials are headache, abdominal pain, breast pain/tenderness and back pain.
The following undesirable effects have been observed with the frequencies indicated below during clinical trials (n=4929):
| MedDRA system organ class | Very common >1/10 | Common >1/100, <1/10 | Uncommon >1/1,000, <1/100 | Rare >1/10,000, <1/1,000 |
| Infections and infestations | Vaginal candidiasis | Cystitis-like syndrome | ||
| Neoplasms benign, malignant and unspecified | Increase in size of leiomyoma | |||
| Immune system disorders | Hypersensitivity | |||
| Psychiatric disorders | Depression, Nervousness | Influence on libido | ||
| Nervous system disorders | Headache | Migraine, Dizziness | ||
| Cardiac disorders | Myocardial infarction | |||
| Vascular disorders | Hypertension, Peripheral vascular disease, Varicose vein, Venous thromboembolism | |||
| Gastrointestinal disorders | Abdominal pain | Nausea, Vomiting, Flatulence | Dyspepsia | |
| Hepatobiliary disorders | Abnormal hepatic function, occasionally with jaundice asthenia or malaise, and abdominal pain, Gall bladder disorder | |||
| Skin and subcutaneous tissue disorders | Allergic skin reactions (e.g. rash, urticaria, pruritus) | Angioedema, Vascular purpura | ||
| Musculoskeletal and connective tissue disorders | Back pain | |||
| Reproductive system and breast disorders | Breast pain/ tenderness | Menstrual disorders (including postmenopausal spotting, metrorrhagia, menorrhagia, oligo-/amenorrhoea, irregular menstruation, dysmenorrhoea), Pelvic pain, Cervical discharge | Breast enlargement, Premenstrual syndrome | |
| General disorders and administration site reactions | Asthenic conditions (asthenia, fatigue, malaise), Peripheral oedema | |||
| Investigations | Increased weight | Decreased weight |
Breast Cancer risk
- An up to 2-fold increased risk of having breast cancer diagnosed is reported in women taking combined oestrogen-progestagen therapy for more than 5 years.
- Any increased risk in users of oestrogen-only therapy is substantially lower than that seen in users of oestrogen-progestagen combinations.
- The level of risk is dependent on the duration of use.
- Results of the largest randomised placebo-controlled trial (WHI-study) and largest epidemiological study (MWS) are presented.
Million Women study- Estimated additional risk of breast cancer after 5 years' use
| Age range (years) | Additional cases per 1000 never-users of HRT over a 5 year period*1 | Risk ratio & 95%CI# | Additional cases per 1000 HRT users over 5 years (95%CI) |
| Oestrogen only HRT | |||
| 50-65 | 9-12 | 1.2 | 1-2 (0-3) |
| Combined oestrogen-progestagen | |||
| 50-65 | 9-12 | 1.7 | 6 (5-7) |
| #Overall risk ratio. The risk ratio is not constant but will increase with increasing duration on use Note: Since the background incidence of breast cancer differs by EU country, the number of additional cases of breast cancer will also change proportionately. | |||
1Taken from baseline incidence rates in developed countries
US WHI studies - additional risk of breast cancer after 5 years' use
| Age range (years) | Incidence per 1000 women in placebo arm over 5 years | Risk ratio & 95%CI | Additional cases per 1000 HRT users over 5 years (95%CI) |
| CEE oestrogen-only | |||
| 50-79 | 21 | 0.8 (0.7 - 1.0) | -4 (-6 - 0)*2 |
| CEE+MPA oestrogen & progestagen‡ | |||
| 50-79 | 17 | 1.2 (1.0 - 1.5) | +4 (0 - 9) |
2WHI study in women with no uterus, which did not show an increase in risk of breast cancer
‡When the analysis was restricted to women who had not used HRT prior to the study there was no increased risk apparent during the first 5 years of treatment: after 5 years the risk was higher than in non-users.
Endometrial cancer
Postmenopausal women with a uterus
The endometrial cancer risk is about 5 in every 1000 women with a uterus not using HRT.
In women with a uterus, use of oestrogen-only HRT is not recommended because it increases the risk of endometrial cancer. Depending on the duration of oestrogen-only use and oestrogen dose, the increase in risk of endometrial cancer in epidemiology studies varied from between 5 and 55 extra cases diagnosed in every 1000 between the ages of 50 and 65.
Adding a progestagen to oestrogen-only therapy for at least 12 days per cycle can prevent this increased risk. In the Million Women Study the use of five years of combined (sequential or continuous) HRT did not increase risk of endometrial cancer (R.R of 1.0 (0.8-1.2)).
Ovarian cancer
Use of oestrogen-only or combined oestrogen-progestogen HRT has been associated with a slightly increased risk of having ovarian cancer diagnosed.
A meta-analysis from 52 epidemiological studies reported an increased risk of ovarian cancer in women currently using HRT compared to women who have never used HRT (RR 1.43, 95% CI 1.31-1.56). For women aged 50 to 54 years after taking 5 years of HRT, this results in about 1 extra case per 2000 users. In women aged 50 to 54 who are not taking HRT, about 2 women in 2000 will be diagnosed with ovarian cancer over a 5-year period.
Risk of venous thromboembolism
HRT is associated with a 1.3-3-fold increased relative risk of developing venous thromboembolism (VTE), i.e. deep vein thrombosis or pulmonary embolism. The occurrence of such an event is more likely in the first year of using HT. Results of the WHI studies are presented:
WHI Studies - Additional risk of VTE over 5 years' use
| Age range (years) | Incidence per 1000 women in placebo arm over 5 years | Risk ratio and 95%CI | Additional cases per 1000 HRT users |
| Oral oestrogen-only*3 | |||
| 50-59 | 7 | 1.2 (0.6-2.4) | 1 (-3 - 10) |
| Oral combined oestrogen-progestagen | |||
| 50-59 | 4 | 2.3 (1.2 - 4.3) | 5 (1 - 13) |
3Study in women with no uterus
Risk of coronary artery disease
- The risk of coronary artery disease is slightly increased in users of combined oestrogen-progestagen HRT over the age of 60.
Risk of ischaemic stroke
- The use of oestrogen-only and oestrogen + progestagen therapy is associated with an up to 1.5 fold increased relative risk of ischaemic stroke.
WHI studies combined - Additional risk of ischaemic stroke*4 over 5 years' use
| Age range (years) | Incidence per 1000 women in placebo arm over 5 years | Risk ratio and 95%CI | Additional cases per 1000 HRT users |
| 50-59 | 8 | 1.3 (1.1-1.6) | 3 (1-5) |
4No differentiation was made between ischaemic and haemorrhagic stroke
Other adverse reactions have been reported in association with oestrogen/progestogen treatment (including oestradiol/dydrogesterone):
Neoplasms benign, malignant and unspecified:
Oestrogen dependent neoplasms both benign and malignant, e.g. endometrial cancer, ovarian cancer. Increase in size of progestogen dependent neoplasms, e.g. meningioma.
Blood and lymphatic system disorders:
Haemolytic anaemia
Immune system disorders:
Systemic lupus erythematosus
Metabolism and nutrition disorders:
Hypertriglyceridemia
Nervous system disorders:
Probable dementia over the age of 65 , chorea, exacerbation of epilepsy
Eye disorders:
Steepening of corneal curvature, contact lenses intolerance
Vascular disorders:
Arterial thromboembolism
Gastrointestinal disorders:
Pancreatitis (in women with pre-existing hypertriglyceridemia)
Skin and subcutaneous tissue disorders:
Erythema multiforme, erythema nodosum, chloasma or melasma, which may persist when drug is discontinued.
Musculoskeletal and connective tissue disorders:
Leg cramps
Renal and urinary disorders:
Urinary incontinence
Reproductive system and breast disorders:
Fibrocystic breast disease, uterine cervical erosion
Congenital, familial and genetic disorders:
Aggravated porphyria
Investigations:
Total thyroid hormones increased
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard.
Both oestradiol and dydrogesterone are substances with low toxicity. Symptoms such as nausea, vomiting, breast tenderness, dizziness, abdominal pain, drowsiness/fatigue, and withdrawal bleeding could occur in cases of overdosing. It is unlikely that any specific or symptomatic treatment will be necessary.
Aforementioned information is applicable for overdosing by children also.
The ATC code is G03FB08. (Oestrogens: urogenital system and sex hormones)
Sequential hormone replacement therapy (combined oestradiol and dydrogesterone).
Oestradiol
The active ingredient, synthetic 17β-oestradiol, is chemically and biologically identical to endogenous human oestradiol. It substitutes for the loss of oestrogen production in menopausal women, and alleviates menopausal symptoms. Oestrogens prevent bone loss following menopause or ovariectomy.
Dydrogesterone
Dydrogesterone is an orally-active progestagen having an activity comparable to parenterally administered progesterone. As oestrogens promote the growth of the endometrium, unopposed oestrogens increase the risk of endometrial hyperplasia and cancer. The addition of a progestagen greatly reduces the oestrogen-induced risk of endometrial hyperplasia in non-hysterectomised women.
Clinical trial information
Relief of oestrogen-deficiency symptoms and bleeding patterns.
- Relief of menopausal symptoms was achieved during the first few weeks of treatment.
- Regular withdrawal bleeding with Femoston 1/5 occurred in approximately 75-80% of women with a mean duration of 5 days.
Withdrawal bleeding usually started on the day of the last pill of the progestagen phase. Break-through bleeding and/or spotting occurred in approximately 10% of the women; amenorrhoea (no bleeding or spotting) occurred in 21-25% of the women for months 10 to 12 of treatment.
- With Femoston 2/10, approximately 90% of women had regular withdrawal bleeding. The start day and duration of bleeding, and the number of women with intermittent bleeding was the same as with Femoston 1/5, amenorrhoea occurred in 7-11% of the women for months 10 to 12 of treatment.
Prevention of osteoporosis
- Oestrogen deficiency at menopause is associated with an increasing bone turnover and decline in bone mass.
- The effect of oestrogens on the bone mineral density is dose-dependent. Protection appears to be effective for as long as treatment is continued. After discontinuation of HRT, bone mass is lost at a rate similar to that in untreated women.
- Evidence from the WHI trial and meta-analysed trials shows that current use of HRT, alone or in combination with a progestagen - given to predominantly healthy women - reduces the risk of hip, vertebral, and other osteoporotic fractures. HRT may also prevent fractures in women with low bone density and/or established osteoporosis, but the evidence for that is limited.
- After two years of treatment with Femoston 2/10, the increase in lumbar spine bone mineral density (BMD) was 6.7% ± 3.9% (mean ± SD). The percentage of women who maintained or gained BMD in lumbar zone during treatment was 94.5%. For Femoston 1/5 the increase in lumbar spine BMD was 5.2% ± 3.8% (mean ± SD), and the percentage of women with no change or an increase in lumbar spine BMD was 93%.
- Femoston also had an effect on hip BMD. The increase after two years of treatment with 1mg oestradiol was 2.7% ± 4.2% (mean ± SD) at femoral neck, 3.5% ± 5.0% (mean ± SD) at trochanter and 2.7%± 6.7% (mean ± SD) at Wards triangle. After two years of treatment with 2mg oestradiol these figures were respectively, 2.6% ± 5.0%; 4.6% ± 5.0% and 4.1% ± 7.4%. The percentage of women who maintained or gained BMD in the 3 hip areas after treatment with 1mg oestradiol was 67-78% and 71-88% after treatment with 2mg oestradiol.
The ATC code is G03FB08. (Oestrogens: urogenital system and sex hormones)
Sequential hormone replacement therapy (combined oestradiol and dydrogesterone).
Oestradiol
The active ingredient, synthetic 17β-oestradiol, is chemically and biologically identical to endogenous human oestradiol. It substitutes for the loss of oestrogen production in menopausal women, and alleviates menopausal symptoms. Oestrogens prevent bone loss following menopause or ovariectomy.
Dydrogesterone
Dydrogesterone is an orally-active progestagen having an activity comparable to parenterally administered progesterone. As oestrogens promote the growth of the endometrium, unopposed oestrogens increase the risk of endometrial hyperplasia and cancer. The addition of a progestagen greatly reduces the oestrogen-induced risk of endometrial hyperplasia in non-hysterectomised women.
Clinical trial information
Relief of oestrogen-deficiency symptoms and bleeding patterns.
- Relief of menopausal symptoms was achieved during the first few weeks of treatment.
- Regular withdrawal bleeding with Femoston 1/10 occurred in approximately 75-80% of women with a mean duration of 5 days.
Withdrawal bleeding usually started on the day of the last pill of the progestagen phase. Break-through bleeding and/or spotting occurred in approximately 10% of the women; amenorrhoea (no bleeding or spotting) occurred in 21-25% of the women for months 10 to 12 of treatment.
- With Femoston 1/5, approximately 90% of women had regular withdrawal bleeding. The start day and duration of bleeding, and the number of women with intermittent bleeding was the same as with Femoston 1/10, amenorrhoea occurred in 7-11% of the women for months 10 to 12 of treatment.
Prevention of osteoporosis
- Oestrogen deficiency at menopause is associated with an increasing bone turnover and decline in bone mass.
- The effect of oestrogens on the bone mineral density is dose-dependent. Protection appears to be effective for as long as treatment is continued. After discontinuation of HRT, bone mass is lost at a rate similar to that in untreated women.
- Evidence from the WHI trial and meta-analysed trials shows that current use of HRT, alone or in combination with a progestagen - given to predominantly healthy women - reduces the risk of hip, vertebral, and other osteoporotic fractures. HRT may also prevent fractures in women with low bone density and/or established osteoporosis, but the evidence for that is limited.
- After two years of treatment with Femoston 1/5, the increase in lumbar spine bone mineral density (BMD) was 6.7% ± 3.9% (mean ± SD). The percentage of women who maintained or gained BMD in lumbar zone during treatment was 94.5%. For Femoston 1/10 the increase in lumbar spine BMD was 5.2% ± 3.8% (mean ± SD), and the percentage of women with no change or an increase in lumbar spine BMD was 93%.
- Femoston also had an effect on hip BMD. The increase after two years of treatment with 1mg oestradiol was 2.7% ± 4.2% (mean ± SD) at femoral neck, 3.5% ± 5.0% (mean ± SD) at trochanter and 2.7%± 6.7% (mean ± SD) at Wards triangle. After two years of treatment with 2mg oestradiol these figures were respectively, 2.6% ± 5.0%; 4.6% ± 5.0% and 4.1% ± 7.4%. The percentage of women who maintained or gained BMD in the 3 hip areas after treatment with 1mg oestradiol was 67-78% and 71-88% after treatment with 2mg oestradiol.
Oestradiol
- Absorption
Absorption of oestradiol is dependent on the particle size: micronized oestradiol is readily absorbed from the gastrointestinal tract.
The following table provides the mean steady state pharmacokinetic parameters of oestradiol (E2), estrone (E1) and estrone sulphate (E1S) for each dose of micronized oestradiol. Data is presented as mean (SD).
| Oestradiol 1mg | ||||
| Parameters | E2 | E1 | Parameters | E1S |
| Cmax (pg/mL) | 71 (36) | 310 (99) | Cmax (ng/mL) | 9.3 (3.9) |
| Cmin (pg/mL) | 18.6 (9.4) | 114 (50) | Cmin (ng/mL) | 2.099 (1.340) |
| Cav (pg/mL) | 30.1 (11.0) | 194 (72) | Cav (ng/mL) | 4.695 (2.350) |
| AUC0-24 (pg.h/mL) | 725 (270) | 4767 (1857) | AUC0-24 (ng.h/mL) | 112.7 (55.1) |
- Distribution
Oestrogens can be found either unbound or bound. About 98-99% of the oestradiol dose binds to plasma proteins, from which about 30-52% to albumin and about 46-69% to the sex hormone-binding globulin (SHBG).
- Metabolism
Following oral administration, oestradiol is extensively metabolised. The major unconjugated and conjugated metabolites are estrone and estrone sulphate. These metabolites can contribute to the oestrogen activity, either directly or after conversion to oestradiol. Estrone sulphate may undergo enterohepatic circulation.
- Elimination
In urine, the major compounds are the glucuronides of estrone and oestradiol. The elimination half-life is between 10-16 h.
Oestrogens are secreted in the milk of nursing mothers.
- Dose and time dependencies
Following daily oral administration of Femoston, oestradiol concentrations reached a steady-state after about five days.
Generally, steady state concentrations appeared to be reached for within 8 to 11 days of dosing.
Dydrogesterone
- Absorption
Following oral administration, dydrogesterone is rapidly absorbed with a Tmax between 0.5 and 2.5 hours. The absolute bioavailability of dydrogesterone (oral 20mg dose versus 7.8mg intravenous infusion) is 28%.
The following table provide the mean steady state pharmacokinetic parameters of dydrogesterone (D) and dihydrodydrogesterone (DHD). Data is presented as mean (SD).
| Dydrogesterone 10mg | ||
| Parameters | D | DHD |
| Cmax (ng/mL) | 2.54 (1.80) | 62.50 (33.10) |
| Cmin (ng/mL) | 0.13 (0.07) | 3.70 (1.67) |
| Cav (ng/mL) | 0.42 (0.25) | 13.04 (4.77) |
| AUC0-t (ng.h/mL) | 9.14 (6.43) | 311.17 (114.35) |
- Distribution
After intravenous administration of dydrogesterone the steady-state volume of distribution is approximately 1400 L. Dydrogesterone and DHD are more than 90% bound to plasma proteins.
- Metabolism
Following oral administration, dydrogesterone is rapidly metabolised to DHD. The levels of the main active metabolite 20 α-dihydrodydrogesterone (DHD) peak about 1.5 hours post dose. The plasma levels of DHD are substantially higher as compared to the parent drug. The AUC and Cmax ratios of DHD to dydrogesterone are in the order of 40 and 25, respectively. Mean terminal half-lives of dydrogesterone and DHD vary between 5 to 7 and 14 to 17 hours, respectively. A common feature of all metabolites characterised is the retention of the 4,6 diene-3-one configuration of the parent compound and the absence of 17α- hydroxylation. This explains the lack of oestrogenic and androgenic effects of dydrogesterone.
- Elimination
After oral administration of labelled dydrogesterone, on average 63% of the dose is excreted into the urine. Total plasma clearance is 6.4 L/min. Within 72 hours excretion is complete. DHD is present in the urine predominantly as the glucuronic acid conjugate.
- Dose and time dependencies
The single and multiple dose pharmacokinetics are linear in the oral dose range 2.5 to 10mg. Comparison of the single and multiple dose kinetics shows that the pharmacokinetics of dydrogesterone and DHD are not changed as a result of repeated dosing. Steady state was reached after 3 days of treatment.
Oestradiol
- Absorption
Absorption of oestradiol is dependent on the particle size: micronized oestradiol is readily absorbed from the gastrointestinal tract.
The following table provides the mean steady state pharmacokinetic parameters of oestradiol (E2), estrone (E1) and estrone sulphate (E1S) for each dose of micronized oestradiol. Data is presented as mean (SD).
| Oestradiol 2mg | ||||
| Parameters | E2 | E1 | Parameters | E1S |
| Cmax (pg/mL) | 103.7 (48.2) | 622.2 (263.6) | Cmax (ng/mL) | 25.9 (16.4) |
| Cmin (pg/mL) | 48 (30) | 270 (138) | Cmin (ng/mL) | 5.7 (5.9) |
| Cav (pg/mL) | 68 (31) | 429 (191) | Cav (ng/mL) | 13.1 (9.4) |
| AUC0-24 (pg.h/mL) | 1619 (733) | 10209 (4561) | AUC0-24 (ng.h/mL) | 307.3 (224.1) |
- Distribution
Oestrogens can be found either unbound or bound. About 98-99% of the oestradiol dose binds to plasma proteins, from which about 30-52% to albumin and about 46-69% to the sex hormone-binding globulin (SHBG).
- Metabolism
Following oral administration, oestradiol is extensively metabolised. The major unconjugated and conjugated metabolites are estrone and estrone sulphate. These metabolites can contribute to the oestrogen activity, either directly or after conversion to oestradiol. Estrone sulphate may undergo enterohepatic circulation.
- Elimination
In urine, the major compounds are the glucuronides of estrone and oestradiol. The elimination half-life is between 10-16 h.
Oestrogens are secreted in the milk of nursing mothers.
- Dose and time dependencies
Following daily oral administration of Femoston, oestradiol concentrations reached a steady-state after about five days.
Generally, steady state concentrations appeared to be reached for within 8 to 11 days of dosing.
Dydrogesterone
- Absorption
Following oral administration, dydrogesterone is rapidly absorbed with a Tmax between 0.5 and 2.5 hours. The absolute bioavailability of dydrogesterone (oral 20mg dose versus 7.8mg intravenous infusion) is 28%.
The following table provide the mean steady state pharmacokinetic parameters of dydrogesterone (D) and dihydrodydrogesterone (DHD). Data is presented as mean (SD).
| Dydrogesterone 10mg | ||
| Parameters | D | DHD |
| Cmax (ng/mL) | 2.54 (1.80) | 62.50 (33.10) |
| Cmin (ng/mL) | 0.13 (0.07) | 3.70 (1.67) |
| Cav (ng/mL) | 0.42 (0.25) | 13.04 (4.77) |
| AUC0-t (ng.h/mL) | 9.14 (6.43) | 311.17 (114.35) |
- Distribution
After intravenous administration of dydrogesterone the steady-state volume of distribution is approximately 1400 L. Dydrogesterone and DHD are more than 90% bound to plasma proteins.
- Metabolism
Following oral administration, dydrogesterone is rapidly metabolised to DHD. The levels of the main active metabolite 20 α-dihydrodydrogesterone (DHD) peak about 1.5 hours post dose. The plasma levels of DHD are substantially higher as compared to the parent drug. The AUC and Cmax ratios of DHD to dydrogesterone are in the order of 40 and 25, respectively. Mean terminal half-lives of dydrogesterone and DHD vary between 5 to 7 and 14 to 17 hours, respectively. A common feature of all metabolites characterised is the retention of the 4,6 diene-3-one configuration of the parent compound and the absence of 17α- hydroxylation. This explains the lack of oestrogenic and androgenic effects of dydrogesterone.
- Elimination
After oral administration of labelled dydrogesterone, on average 63% of the dose is excreted into the urine. Total plasma clearance is 6.4 L/min. Within 72 hours excretion is complete. DHD is present in the urine predominantly as the glucuronic acid conjugate.
- Dose and time dependencies
The single and multiple dose pharmacokinetics are linear in the oral dose range 2.5 to 10mg. Comparison of the single and multiple dose kinetics shows that the pharmacokinetics of dydrogesterone and DHD are not changed as a result of repeated dosing. Steady state was reached after 3 days of treatment.
There are no preclinical safety data of relevance to the prescriber in the target population that are additional to those already included in other sections of the Summary of Product Characteristics (SmPC).
Not applicable.
Any unused product or waste material should be disposed of in accordance with local requirements.
