Medically reviewed by Oliinyk Elizabeth Ivanovna, PharmD. Last updated on 2020-03-19
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Apo-Raloxifene is indicated for the treatment and prevention of osteoporosis in postmenopausal women. A significant reduction in the incidence of vertebral, but not hip fractures has been demonstrated.
When determining the choice of Apo-Raloxifene or other therapies, including oestrogens, for an individual postmenopausal woman, consideration should be given to menopausal symptoms, effects on uterine and breast tissues, and cardiovascular risks and benefits.
The recommended dose is one tablet daily by oral administration, which may be taken at any time of the day without regard to meals. Due to the nature of this disease process, Apo-Raloxifene is intended for long term use.
Generally calcium and vitamin D supplements are advised in women with a low dietary intake.
No dose adjustment is necessary for the elderly.
Apo-Raloxifene should not be used in patients with severe renal impairment. In patients with moderate and mild renal impairment, Apo-Raloxifene should be used with caution.
Apo-Raloxifene should not be used in patients with hepatic impairment.
Apo-Raloxifene should not be used in children of any age. There is no relevant use of Apo-Raloxifene in the paediatric population.
Must not be used in women with child bearing potential.
Active or past history of venous thromboembolic events (VTE), including deep vein thrombosis, pulmonary embolism and retinal vein thrombosis.
Hepatic impairment including cholestasis.
Severe renal impairment.
Unexplained uterine bleeding.
Apo-Raloxifene should not be used in patients with signs or symptoms of endometrial cancer as safety in this patient group has not been adequately studied.
Raloxifene is associated with an increased risk for venous thromboembolic events that is similar to the reported risk associated with current use of hormone replacement therapy. The risk-benefit balance should be considered in patients at risk of venous thromboembolic events of any aetiology. Apo-Raloxifene should be discontinued in the event of an illness or a condition leading to a prolonged period of immobilisation. Discontinuation should happen as soon as possible in case of the illness, or from 3 days before the immobilisation occurs. Therapy should not be restarted until the initiating condition has resolved and the patient is fully mobile.
In a study of postmenopausal women with documented coronary heart disease or at increased risk for coronary events, raloxifene did not affect the incidence of myocardial infarction, hospitalized acute coronary syndrome, overall mortality, including overall cardiovascular mortality, or stroke, compared to placebo. However, there was an increase in death due to stroke in women assigned to raloxifene. The incidence of stroke mortality was 2.2 per 1000 women per year for raloxifene versus 1.5 per 1000 women per year for placebo. This finding should be considered when prescribing raloxifene for postmenopausal women with a history of stroke or other significant stroke risk factors, such as transient ischemic attack or atrial fibrillation.
There is no evidence of endometrial proliferation. Any uterine bleeding during Apo-Raloxifene therapy is unexpected and should be fully investigated by a specialist. The two most frequent diagnoses associated with uterine bleeding during raloxifene treatment were endometrial atrophy and benign endometrial polyps. In postmenopausal women who received raloxifene treatment for 4 years, benign endometrial polyps were reported in 0.9 % compared to 0.3 % in women who received placebo treatment.
Raloxifene is metabolised primarily in the liver. Single doses of raloxifene given to patients with cirrhosis and mild hepatic impairment (Child-Pugh class A) produced plasma concentrations of raloxifene which were approximately 2.5 times the controls. The increase correlated with total bilirubin concentrations. Therefore Apo-Raloxifene is not recommended to be used in patients with hepatic insufficiency. Serum total bilirubin, gamma-glutamyl transferase, alkaline phosphatase, ALT and AST should be closely monitored during treatment if elevated values are observed.
Limited clinical data suggest that in patients with a history of oral oestrogen-induced hypertriglyceridemia (>5.6 mmol/l), raloxifene may be associated with a marked increase in serum triglycerides. Patients with this medical history should have serum triglycerides monitored when taking raloxifene.
The safety of Apo-Raloxifene in patients with breast cancer has not been adequately studied. No data are available on the concomitant use of Apo-Raloxifene and agents used in the treatment of early or advanced breast cancer. Therefore, Apo-Raloxifene should be used for osteoporosis treatment and prevention only after the treatment of breast cancer, including adjuvant therapy, has been completed.
As safety information regarding co-administration of raloxifene with systemic oestrogens is limited, such use is not recommended.
Apo-Raloxifene is not effective in reducing vasodilatation (hot flushes), or other symptoms of the menopause associated with oestrogen deficiency.
Apo-Raloxifene contains lactose. Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicine.
Raloxifene has no or negligible influence on the ability to drive and use machines.
a. Summary of the safety profile
The clinically most important adverse reactions reported in postmenopausal women treated with Apo-Raloxifene were venous thromboembolic events , which occurred in less than 1% of treated patients.
b. Tabulated summary of adverse reactions
The table below gives the adverse reactions and frequencies observed in treatment and prevention studies involving over 13,000 postmenopausal women along with adverse reactions arising from postmarketing reports. The duration of treatment in these studies ranged from 6 to 60 months. The majority of adverse reactions have not usually required cessation of therapy.
The frequencies for postmarketing reports were calculated from placebo-controlled clinical trials (comprising a total of 15,234 patients, 7,601 on raloxifene 60 mg and 7,633 on placebo) in postmenopausal women with osteoporosis, or established coronary heart disease (CHD) or increased risk for CHD, without comparison to the frequencies of adverse events in the placebo assignment groups.
In the prevention population discontinuations of therapy due to any adverse reaction occurred in 10.7 % of 581 Apo-Raloxifene treated patients and 11.1 % of 584 placebo-treated patients. In the treatment population discontinuations of therapy due to any clinical adverse event occurred in 12.8 % of 2,557 Apo-Raloxifene treated patients and 11.1 % of 2,576 placebo treated patients.
The following convention has been used for the classification of the adverse reactions: very common (>1/10), common (>1/100 to <1/10), uncommon (>1/1,000 to <1/100), rare (>1/10,000 to <1/1,000), very rare (<1/10,000).
Blood and lymphatic system disorders
Uncommon: Thrombocytopenia a
Nervous system disorders
Common: Headache, including migraine a
Uncommon: Fatal strokes
Very common: Vasodilation (hot flushes)
Uncommon: Venous thromboembolic events, including deep vein thrombosis, pulmonary embolism, retinal vein thrombosis, superficial vein thrombophlebitis, Arterial thromboembolic reactions a
Very common: Gastrointestinal symptoms a such as nausea, vomiting, abdominal pain, dyspepsia
Skin and subcutaneous tissue disorders
Common: Rash a
Musculoskeletal and connective tissue disorders
Common: Leg cramps
Reproductive system and breast disorders
Common: Mild breast symptoms a such as pain, enlargement and tenderness
General disorders and administration site conditions
Very common: Flu syndrome
Common: Peripheral oedema
Very common: Increased blood pressure a
a Term(s) included based on postmarketing experience.
c. Description of selected adverse reactions
Compared with placebo-treated patients the occurrence of vasodilatation (hot flushes) was modestly increased in Apo-Raloxifene patients (clinical trials for the prevention of osteoporosis, 2 to 8 years postmenopausal, 24.3 % Apo-Raloxifene and 18.2 % placebo; clinical trials for the treatment of osteoporosis, mean age 66, 10.6 % for Apo-Raloxifene and 7.1 % placebo). This adverse reaction was most common in the first 6 months of treatment, and seldom occurred de novo after that time.
In a study of 10,101 postmenopausal women with documented coronary heart disease or at increased risk for coronary events (RUTH), the occurrence of vasodilatation (hot flushes) was 7.8 % in the raloxifene-treated patients and 4.7 % in the placebo-treated patients.
Across all placebo-controlled clinical trials of raloxifene in osteoporosis, venous thromboembolic events, including deep vein thrombosis, pulmonary embolism, and retinal vein thrombosis occurred at a frequency of approximately 0.8 % or 3.22 cases per 1,000 patient years. A relative risk of 1.60 (CI 0.95, 2.71) was observed in Apo-Raloxifene treated patients compared to placebo. The risk of a thromboembolic event was greatest in the first four months of therapy. Superficial vein thrombophlebitis occurred in a frequency of less than 1 %.
In the RUTH study, venous thromboembolic events occurred at a frequency of approximately 2.0 % or 3.88 cases per 1,000 patient-years in the raloxifene group and 1.4 % or 2.70 cases per 1,000 patient-years in the placebo group. The hazard ratio for all VTE events in the RUTH study was HR = 1.44 (1.06 - 1.95). Superficial vein thrombophlebitis occurred in a frequency of 1 % in the raloxifene group and 0.6 % in the placebo group.
In the RUTH study, raloxifene did not affect the incidence of stroke, compared to placebo. However, there was an increase in death due to stroke in women assigned to raloxifene. The incidence of stroke mortality was 2.2 per 1,000 women per year for raloxifene versus 1.5 per 1,000 women per year for placebo. During an average follow-up of 5.6 years, 59 (1.2%) raloxifene-treated women died due to a stroke compared to 39 (0.8%) placebo-treated women.
Another adverse reaction observed was leg cramps (5.5 % for Apo-Raloxifene, 1.9 % for placebo in the prevention population and 9.2 % for Apo-Raloxifene, 6.0 % for placebo in the treatment population).
In the RUTH study, leg cramps were observed in 12.1 % of raloxifene-treated patients and 8.3 % of placebo-treated patients.
Flu syndrome was reported by 16.2 % of Apo-Raloxifene treated patients and 14.0 % of placebo treated patients.
One further change was seen which was not statistically significant (p > 0.05), but which did show a significant dose trend. This was peripheral oedema, which occurred in the prevention population at an incidence of 3.1 % for Apo-Raloxifene and 1.9 % for placebo; and in the treatment population occurred at an incidence of 7.1 % for Apo-Raloxifene and 6.1 % for placebo.
In the RUTH study, peripheral oedema occurred in 14.1 % of the raloxifene-treated patients and 11.7 % of the placebo-treated patients, which was statistically significant.
Slightly decreased (6-10 %) platelet counts have been reported during raloxifene treatment in placebo-controlled clinical trials of raloxifene in osteoporosis.
Rare cases of moderate increases in AST and/or ALT have been reported where a causal relationship to raloxifene can not be excluded. A similar frequency of increases was noted among placebo patients.
In a study (RUTH) of postmenopausal women with documented coronary heart disease or at increased risk for coronary events, an additional adverse reaction of cholelithiasis occurred in 3.3 % of patients treated with raloxifene and 2.6 % of patients treated with placebo. Cholecystectomy rates for raloxifene (2.3 %) were not statistically significantly different from placebo (2.0 %).
Apo-Raloxifene (n = 317) was compared with continuous combined (n = 110) hormone replacement therapy (HRT) or cyclic (n = 205) HRT patients in some clinical trials. The incidence of breast symptoms and uterine bleeding in raloxifene treated women was significantly lower than in women treated with either form of HRT.
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:
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In some clinical trials, daily doses were given up to 600 mg for 8 weeks and 120 mg, for 3 years. No cases of raloxifene overdose were reported during clinical trials.
In adults, symptoms of leg cramps and dizziness have been reported in patients who took more than 120 mg as a single ingestion.
In accidental overdose in children younger than 2 years of age, the maximum reported dose has been 180 mg. In children, symptoms of accidental overdose included ataxia, dizziness, vomiting, rash, diarrhea, tremor, and flushing, and elevation in alkaline phosphatase.
The highest overdose has been approximately 1.5 grams. No fatalities associated with overdose have been reported.
There is no specific antidote for raloxifene hydrochloride.
Pharmacotherapeutic group: Selective Oestrogen Receptor Modulator, ATC code: G03XC01.
Mechanism of action and Pharmacodynamic effect
As a selective oestrogen receptor modulator (SERM), raloxifene has selective agonist or antagonist activities on tissues responsive to oestrogen. It acts as an agonist on bone and partially on cholesterol metabolism (decrease in total and LDL-cholesterol), but not in the hypothalamus or in the uterine or breast tissues.
Raloxifene's biological actions, like those of oestrogen, are mediated through high affinity binding to oestrogen receptors and regulation of gene expression. This binding results in differential expression of multiple oestrogen-regulated genes in different tissues. Data suggests that the oestrogen receptor can regulate gene expression by at least two distinct pathways which are ligand-, tissue-, and/or gene-specific.
a) Skeletal Effects
The decrease in oestrogen availability which occurs at menopause, leads to marked increases in bone resorption, bone loss and risk of fracture. Bone loss is particularly rapid for the first 10 years after menopause when the compensatory increase in bone formation is inadequate to keep up with resorptive losses. Other risk factors which may lead to the development of osteoporosis include early menopause; osteopenia (at least 1 SD below peak bone mass); thin body build; Caucasian or Asian ethnic origin; and a family history of osteoporosis. Replacement therapies generally reverse the excessive resorption of bone. In postmenopausal women with osteoporosis, Apo-Raloxifene reduces the incidence of vertebral fractures, preserves bone mass and increases bone mineral density (BMD).
Based on these risk factors, prevention of osteoporosis with Apo-Raloxifene is indicated for women within ten years of menopause, with BMD of the spine between 1.0 and 2.5 SD below the mean value of a normal young population, taking into account their high lifetime risk for osteoporotic fractures. Likewise, Apo-Raloxifene is indicated for the treatment of osteoporosis or established osteoporosis in women with BMD of the spine 2.5 SD below the mean value of a normal young population and/or with vertebral fractures, irrespective of BMD.
i) Incidence of fractures. In a study of 7,705 postmenopausal women with a mean age of 66 years and with osteoporosis or osteoporosis with an existing fracture, Apo-Raloxifene treatment for 3 years reduced the incidence of vertebral fractures by 47 % (RR 0.53, CI 0.35, 0.79; p < 0.001) and 31 % (RR 0.69, CI 0.56, 0.86; p < 0.001) respectively. Forty five women with osteoporosis or 15 women with osteoporosis with an existing fracture would need to be treated with Apo-Raloxifene for 3 years to prevent one or more vertebral fractures. Apo-Raloxifene treatment for 4 years reduced the incidence of vertebral fractures by 46 % (RR 0.54, CI 0.38, 0.75) and 32 % (RR 0.68, CI 0.56, 0.83) in patients with osteoporosis or osteoporosis with an existing fracture respectively. In the 4th year alone, Apo-Raloxifene reduced the new vertebral fracture risk by 39 % (RR 0.61, CI 0.43, 0.88). An effect on non-vertebral fractures has not been demonstrated. From the 4th to the 8th year, patients were permitted the concomitant use of bisphosphonates, calcitonin and fluorides and all patients in this study received calcium and vitamin D supplementation.
In the RUTH study overall clinical fractures were collected as a secondary endpoint. Apo-Raloxifene reduced the incidence of clinical vertebral fractures by 35% compared with placebo (HR 0.65, CI 0.47 0.89). These results may have been confounded by baseline differences in BMD and vertebral fractures. There was no difference between treatment groups in the incidence of new nonvertebral fractures. During the whole length of the study concomitant use of other bone-active medications was permitted.
ii) Bone Mineral Density (BMD): The efficacy of Apo-Raloxifene once daily in postmenopausal women aged up to 60 years and with or without a uterus was established over a two-year treatment period. The women were 2 to 8 years postmenopausal. Three trials included 1,764 postmenopausal women who were treated with Apo-Raloxifene and calcium or calcium supplemented placebo. In one of these trials the women had previously undergone hysterectomy. Apo-Raloxifene produced significant increases in bone density of hip and spine as well as total body mineral mass compared to placebo. This increase was generally a 2 % increase in BMD compared to placebo. A similar increase in BMD was seen in the treatment population who received Apo-Raloxifene for up to 7 years. In the prevention trials, the percentage of subjects experiencing an increase or decrease in BMD during raloxifene therapy was: for the spine 37 % decreased and 63 % increased; and for the total hip 29 % decreased and 71 % increased.
iii) Calcium kinetics. Apo-Raloxifene and oestrogen affect bone remodelling and calcium metabolism similarly. Apo-Raloxifene was associated with reduced bone resorption and a mean positive shift in calcium balance of 60 mg per day, due primarily to decreased urinary calcium losses.
iv) Histomorphometry (bone quality). In a study comparing Apo-Raloxifene with oestrogen, bone from patients treated with either medicinal product was histologically normal, with no evidence of mineralisation defects, woven bone or marrow fibrosis.
Raloxifene decreases resorption of bone; this effect on bone is manifested as reductions in the serum and urine levels of bone turnover markers, decreases in bone resorption based on radiocalcium kinetics studies, increases in BMD and decreases in the incidence of fractures.
b) Effects on lipid metabolism and cardiovascular risk
Clinical trials showed that a 60 mg daily dose of Apo-Raloxifene significantly decreased total cholesterol (3 to 6 %), and LDL cholesterol (4 to 10 %). Women with the highest baseline cholesterol levels had the greatest decreases. HDL cholesterol and triglyceride concentrations did not change significantly. After 3 years therapy Apo-Raloxifene decreased fibrinogen (6.71 %). In the osteoporosis treatment study, significantly fewer Apo-Raloxifene-treated patients required initiation of hypolipidaemic therapy compared to placebo.
Apo-Raloxifene therapy for 8 years did not significantly affect the risk of cardiovascular events in patients enrolled in the osteoporosis treatment study. Similarly, in the RUTH study, raloxifene did not affect the incidence of myocardial infarction, hospitalized acute coronary syndrome, stroke or overall mortality, including overall cardiovascular mortality, compared to placebo.
The relative risk of venous thromboembolic events observed during raloxifene treatment was 1.60 (CI 0.95, 2.71) when compared to placebo, and was 1.0 (CI 0.3, 6.2) when compared to oestrogen or hormonal replacement therapy. The risk of a thromboembolic event was greatest in the first four months of therapy.
c) Effects on the endometrium and on the pelvic floor
In clinical trials, Apo-Raloxifene did not stimulate the postmenopausal uterine endometrium. Compared to placebo, raloxifene was not associated with spotting or bleeding or endometrial hyperplasia. Nearly 3,000 transvaginal ultrasound (TVUs) examinations were evaluated from 831 women in all dose groups. Raloxifene treated women consistently had an endometrial thickness which was indistinguishable from placebo. After 3 years of treatment, at least a 5 mm increase in endometrial thickness, assessed with transvaginal ultrasound, was observed in 1.9 % of the 211 women treated with raloxifene 60 mg/day compared to 1.8 % of the 219 women who received placebo. There were no differences between the raloxifene and placebo groups with respect to the incidence of reported uterine bleeding.
Endometrial biopsies taken after six months therapy with Apo-Raloxifene 60 mg daily demonstrated non-proliferative endometrium in all patients. In addition, in a study with 2.5 x the recommended daily dose of Apo-Raloxifene there was no evidence of endometrial proliferation and no increase in uterine volume.
In the osteoporosis treatment trial, endometrial thickness was evaluated annually in a subset of the study population (1,644 patients) for 4 years. Endometrial thickness measurements in Apo-Raloxifene treated women were not different from baseline after 4 years of therapy. There was no difference between Apo-Raloxifene and placebo treated women in the incidences of vaginal bleeding (spotting) or vaginal discharge. Fewer Apo-Raloxifene treated women than placebo treated women required surgical intervention for uterine prolapse. Safety information following 3 years of raloxifene treatment suggests that raloxifene treatment does not increase pelvic floor relaxation and pelvic floor surgery.
After 4 years, raloxifene did not increase the risk of endometrial or ovarian cancer. In postmenopausal women who received raloxifene treatment for 4 years, benign endometrial polyps were reported in 0.9 % compared to 0.3 % in women who received placebo treatment.
d) Effects on breast tissue
Apo-Raloxifene does not stimulate breast tissue. Across all placebo-controlled trials, Apo-Raloxifene was indistinguishable from placebo with regard to frequency and severity of breast symptoms (no swelling, tenderness and breast pain).
Over the 4 years of the osteoporosis treatment trial (involving 7,705 patients), Apo-Raloxifene treatment compared to placebo reduced the risk of total breast cancer by 62 % (RR 0.38; CI 0.21, 0.69), the risk of invasive breast cancer by 71 % (RR 0.29, CI 0.13, 0.58) and the risk of invasive oestrogen receptor (ER) positive breast cancer by 79 % (RR 0.21, CI 0.07, 0.50). Apo-Raloxifene has no effect on the risk of ER negative breast cancers. These observations support the conclusion that raloxifene has no intrinsic oestrogen agonist activity in breast tissue.
e) Effects on cognitive function
No adverse effects on cognitive function have been seen.
Raloxifene is absorbed rapidly after oral administration. Approximately 60 % of an oral dose is absorbed. Presystemic glucuronidation is extensive. Absolute bioavailability of raloxifene is 2 %. The time to reach average maximum plasma concentration and bioavailability are functions of systemic interconversion and enterohepatic cycling of raloxifene and its glucuronide metabolites.
Raloxifene is distributed extensively in the body. The volume of distribution is not dose dependent. Raloxifene is strongly bound to plasma proteins (98-99 %).
Raloxifene undergoes extensive first pass metabolism to the glucuronide conjugates: raloxifene-4'-glucuronide, raloxifene-6-glucuronide, and raloxifene-6, 4â€²-diglucuronide. No other metabolites have been detected. Raloxifene comprises less than 1 % of the combined concentrations of raloxifene and the glucuronide metabolites. Raloxifene levels are maintained by enterohepatic recycling, giving a plasma half-life of 27.7 hours.
Results from single oral doses of raloxifene predict multiple dose pharmacokinetics. Increasing doses of raloxifene result in slightly less than proportional increase in the area under the plasma time concentration curve (AUC).
The majority of a dose of raloxifene and glucuronide metabolites are excreted within 5 days and are found primarily in the faeces, with less than 6 % excreted in urine.
Renal insufficiency - Less than 6 % of the total dose is eliminated in urine. In a population pharmacokinetic study, a 47 % decrease in lean body mass adjusted creatinine clearance resulted in a 17 % decrease in raloxifene clearance and a 15 % decrease in the clearance of raloxifene conjugates.
Hepatic insufficiency - The pharmacokinetics of a single dose of raloxifene in patients with cirrhosis and mild hepatic impairment (Child-Pugh class A) have been compared to that in healthy individuals. Plasma raloxifene concentrations were approximately 2.5-fold higher than in controls and correlated with bilirubin concentrations.
In a 2-year carcinogenicity study in rats, an increase in ovarian tumors of granulosa/theca cell origin was observed in high-dose females (279 mg/kg/day). Systemic exposure (AUC) of raloxifene in this group was approximately 400 times that in postmenopausal women administered a 60 mg dose. In a 21-month carcinogenicity study in mice, there was an increased incidence of testicular interstitial cell tumours and prostatic adenomas and adenocarcinomas in males given 41 or 210 mg/kg, and prostatic leiomyoblastoma in males given 210 mg/kg. In female mice, an increased incidence of ovarian tumours in animals given 9 to 242 mg/kg (0.3 to 32 times the AUC in humans) included benign and malignant tumours of granulosa/theca cell origin and benign tumours of epithelial cell origin. The female rodents in these studies were treated during their reproductive lives, when their ovaries were functional and highly responsive to hormonal stimulation. In contrast to the highly responsive ovaries in this rodent model, the human ovary after menopause is relatively unresponsive to reproductive hormonal stimulation.
Raloxifene was not genotoxic in any of the extensive battery of test systems applied.
The reproductive and developmental effects observed in animals are consistent with the known pharmacological profile of raloxifene. At doses of 0.1 to 10 mg/kg/day in female rats, raloxifene disrupted estrous cycles of female rats during treatment, but did not delay fertile matings after treatment termination and only marginally reduced litter size, increased gestation length, and altered the timing of events in neonatal development. When given during the preimplantation period, raloxifene delayed and disrupted embryo implantation resulting in prolonged gestation and reduced litter size but development of offspring to weaning was not affected. Teratology studies were conducted in rabbits and rats. In rabbits, abortion and a low rate of ventricular septal defects (> 0.1 mg/kg) and hydrocephaly (> 10 mg/kg) were seen. In rats retardation of foetal development, wavy ribs and kidney cavitation occurred (> 1 mg/kg).
Raloxifene is a potent antioestrogen in the rat uterus and prevented growth of oestrogen-dependent mammary tumours in rats and mice.
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