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Femoston 1

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Femoston 1

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Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

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Overview of Femoston 1

Property Description
Active ingredient Estradiol and Dydrogesterone
Form Film-coated tablet
Pharmacological class Estrogen-Progestogen Combination
Common use Hormone Replacement Therapy (HRT) for postmenopausal symptoms
Origin Synthetic derivative (Dydrogesterone) and chemically bio-identical (Estradiol)

Femoston 1 is a prescription-only medication defined as a fixed combination product for oral administration, classified as a Hormone Replacement Therapy (HRT) product. The drug falls under the pharmacological class of Estrogen-Progestogen Combinations within the Genito urinary system and sex hormones. This combination regimen is essential for postmenopausal women who retain an intact uterus (womb), as it fulfills the requirement to counter the proliferative effects associated with estrogen therapy.

The core of this formulation involves two active ingredients: Estradiol and Dydrogesterone. Estradiol is the estrogen component, supplied as estradiol hemihydrate, which is a molecule chemically and biologically identical to endogenous human oestradiol. This bio-identical approach is used to substitute declining hormone levels.

Dydrogesterone is the accompanying progestogen component, a synthetic hormone derivative that acts selectively on the progesterone receptor. This specific retroprogesterone structure distinguishes it from other progestogens; it acts to provide uterine protection. The overall general therapeutic purpose is therefore two-fold: to alleviate the characteristic discomforts arising from postmenopausal estrogen deficiency symptoms and to provide the necessary endometrial safety for non-hysterectomised women.

Regulatory References

  1. NIH
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What side effects are possible with Femoston 1?

Possible Side Effects and Safety Information

The safety profile for Estradiol/Dydrogesterone is officially documented by regulatory authorities, with adverse reactions categorized by frequency and the affected System-Organ Class (SOC). The most Very Common (ge 1/10) officially listed effects include headache, abdominal pain, back pain, and breast pain or tenderness. Common effects (ge 1/100 to < 1/10) often involve the reproductive system (menstrual disorders), nervous system (migraine, dizziness), and psychiatric disorders (depression, nervousness).

Key safety information addresses the documented risks associated with the entire Hormone Replacement Therapy (HRT) class. Serious adverse reactions highlighted in regulatory labeling include an increased risk of Venous Thromboembolism (VTE), such as Deep Vein Thrombosis and Pulmonary Embolism, and Arterial Thromboembolic Events, including Stroke and Myocardial Infarction. An increased risk of Breast Cancer is also documented, particularly with long-term use of combined therapy.

Time-related safety patterns are noted in official documents: the increased VTE risk is officially documented as being greater during the first year of HRT use, and irregular bleeding or spotting is often transient during the first months of treatment. High-level safety constraints formally prohibit the use of this medication in individuals with a current or history of thromboembolic disease, specific types of neoplasms, or severe hepatic impairment. For women 65 years of age and older, the HRT class has been associated with an increased risk of probable dementia, as documented in safety surveillance.

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Overdose and Emergency Response

The official regulatory documentation on acute overdose with Femoston 1, an estrogen-progestogen combination, outlines specific clinical manifestations and mandated emergency responses.

Documented Clinical Manifestations

Symptoms associated with acute overdose include gastrointestinal effects such as nausea, vomiting, and abdominal pain. Additional officially documented clinical signs are breast tenderness, drowsiness, and fatigue. Vaginal bleeding, often described as a form of withdrawal bleeding, may also occur several days following the excessive exposure.

Official Severity and Management

Acute overdose with this type of hormone replacement therapy product is generally not expected to lead to serious or life-threatening symptoms. However, regulatory guidance strictly mandates immediate action. Management is limited to symptomatic and supportive treatment, as no specific antidote is known. Hospital monitoring may be required to observe vital signs and administer procedures like activated charcoal or intravenous fluids in more severe cases.

When to Seek Urgent Help

Individuals must seek immediate medical attention or contact a poison control helpline for any suspected overdose event. Emergency services must be contacted immediately if the person has collapsed, experienced a seizure, has trouble breathing, or cannot be awakened. These actions are required to ensure rapid medical intervention following an acute event.

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Therapeutic Uses of Femoston 1

Quick Facts

  • May be used to assist with the relief of symptoms associated with estrogen deficiency after menopause.
  • Intended for use in women who have not had a hysterectomy.
  • May be considered for the prevention of bone mineral density loss in specific high-risk postmenopausal women.

Femoston 1 is a treatment option utilized in Hormone Replacement Therapy (HRT) for women with an intact uterus. This medication is primarily indicated for assisting with the management of symptoms that may develop following menopause, which are linked to a reduction in estrogen levels. These symptoms can include hot flashes, night sweats, and localized discomfort.

The therapeutic purpose of this product is to address discomfort and aid in the overall management of the menopausal transition.

Additionally, this formulation may be prescribed for the prevention of postmenopausal bone mineral density loss. Use for this indication is typically considered for women who are at an increased risk of future bone fractures and for whom other established therapeutic options are not suitable or contraindicated.

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Eligibility and Restrictions for Use

Who Can and Cannot Use Femoston 1?

Femoston 1 is a Hormone Replacement Therapy (HRT) product with specific population eligibility rules defined by regulatory authorities.


Populations Permitted for Use

Femoston 1 is intended for postmenopausal women seeking relief from estrogen deficiency symptoms. Its use is specifically restricted to women who have an intact uterus (who have not had a hysterectomy).


Absolute Contraindications (Must Not Use)

Femoston 1 is strictly contraindicated in patients with the following conditions, as per official labeling:

  • History of Venous Thromboembolism (VTE) (e.g., DVT, pulmonary embolism) or Arterial Thromboembolic Disease (e.g., stroke, myocardial infarction).
  • Known or suspected estrogen-dependent malignant tumours (e.g., breast cancer) or progestogen-dependent tumours.
  • Undiagnosed genital bleeding or untreated endometrial hyperplasia.
  • Acute liver disease where liver function tests have not returned to normal.
  • Porphyria or known hypersensitivity to the active substances.

Age and Physiological Restrictions

  • Pediatric Use: The medicine is not recommended for use in children and adolescents.
  • Pregnancy/Lactation: It is contraindicated in pregnancy and not indicated during breastfeeding. The product is not intended for women of reproductive potential.
  • Renal Impairment: Use is not established as no official safety data are available for patients with renal impairment.
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What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Femoston 1, which contains estradiol and dydrogesterone, is primarily defined by the way other medicines affect the body's drug-processing enzymes, specifically those in the Cytochrome P450 (CYP) system.

Enzyme Inducers and Decreased Effectiveness

Co-administration with potent enzyme inducers can increase the metabolism of both active substances, leading to a decreased therapeutic effect. Medicines known to cause this enzyme induction include anticonvulsants like phenytoin and phenobarbital, anti-infectives such as rifampicin, and the herbal product St John's Wort (Hypericum perforatum). This effect necessitates clinical consideration to maintain the intended efficacy.

Impact on Co-administered Drugs

Femoston 1 may also affect the action of other medicines. The estrogen component can inhibit the metabolism of certain drugs that have a narrow therapeutic index (meaning small changes in concentration can have significant effects). Co-administration with such drugs, including tacrolimus and cyclosporine A, requires careful monitoring and potential dosage adjustment of the co-administered medicine.

Specific Drug Combinations

The product may reduce the plasma concentrations of lamotrigine, potentially leading to a loss of seizure control. Caution is also noted with certain Hepatitis C Virus (HCV) combination regimens (e.g., those containing ombitasvir/paritaprevir/ritonavir), which have been associated with increased liver enzyme levels when used with estrogen-containing products.

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Mechanism of Action

Femoston 1 comprises two compounds: estradiol and dydrogesterone. Estradiol is a synthetic 17beta-estradiol molecule that functions as an agonist at nuclear estrogen receptors (ERalpha and ERbeta). Upon binding, the activated receptor complex translocates to the nucleus and modulates gene transcription by binding to estrogen response elements (EREs) on DNA. This results in the proliferation of certain target tissues, including the endometrium and tissues in the skeletal and cardiovascular systems.

Dydrogesterone is an orally-active progestogen that acts as an agonist at the nuclear progesterone receptor (PR). Its activation of the PR also leads to altered gene transcription. In the estradiol-primed endometrium, dydrogesterone specifically induces secretory changes in the endometrial stroma and glandular epithelium, counteracting the estradiol-mediated proliferative phase. This systemic modulation of estrogen and progesterone signaling contributes to the cyclic physiological changes in the reproductive and non-reproductive organ systems.

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Dosage and Administration Information

Femoston 1 is administered through a continuous sequential regimen for oral use, with one tablet taken daily for 28 consecutive days. The treatment is typically started with the lowest effective dose for the shortest duration necessary.

Administration Scope

Element Detail
Route of administration: Oral (by mouth).
Dosing schedule: One tablet daily in a continuous sequential combined regimen for 28 days.
Timing in relation to meals (if applicable): May be taken with or without food.
Age-group administration rules: Use in the paediatric population is not indicated. Experience in treating women over 65 years is limited.
Missed-dose rules: If more than 12 hours have elapsed since the scheduled time, the missed dose should be skipped, and the next dose taken at the regular time.

Resulting Procedural Structure

Established step sequence:

  • Phase 1 (Days 1–14): Take the white tablet (estradiol 1 mg) once daily.
  • Phase 2 (Days 15–28): Take the grey tablet (estradiol 1 mg / dydrogesterone 10 mg combination) once daily.
  • Continuous Continuation: Immediately after the 28th tablet is taken, a new 28-day cycle must begin from a new pack without a tablet-free interval.

The protocol involves taking the tablets at approximately the same time each day to ensure consistent daily dosing. The two-phase structure and sequential intake are essential components of the administration procedure for this combination product.

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Recent Clinical Evidence

Research evidence / Overview of Studies for Femoston 1


Evidence for Symptom Management Following Menopause

Research on Femoston 1 has explored how the combination was studied in relation to physical discomfort and outcomes related to systemic or functional imbalance associated with postmenopausal symptoms. The evidence is largely derived from Randomized Controlled Trials (RCTs), which were used in trials assessing short-term or episodic symptom patterns.

Researchers examined outcomes related to physical discomfort, such as the frequency and severity of hot flashes and night sweats. The findings describe patterns observed in the studies over short-term intervals, such as a few weeks to several months. What remains uncertain is the availability of specific data on sustained outcome patterns extending beyond the typical intermediate follow-up durations. Comparative evidence is lacking against all other available Hormone Replacement Therapy (HRT) options.


Evidence for Preventing Postmenopausal Bone Mineral Density Loss

The combination was evaluated in women after menopause in research exploring outcomes related to bone mineral density (BMD) changes. Research on this use is primarily conducted in women who were identified as being at a higher risk for bone fractures and for whom other established therapies were not suitable. This line of research often uses Randomized Controlled Trials and studies monitored changes in BMD.

Trials lasting approximately two years reported how symptoms evolved in the observed populations, describing patterns in the measured BMD when compared to initial readings. The follow-up durations were limited in many of the dedicated BMD studies, which typically measure outcomes over two years. Long-term effects are not fully established regarding fracture rates specific to this exact combination.


Studies Confirming Endometrial Safety

Research has specifically examined the necessity of including the progestogen component, dydrogesterone, for women who still have their uterus. This is a critical research area because estrogen-only therapy was associated with changes in the lining of the uterus. Studies monitored the incidence of conditions like endometrial hyperplasia (thickening of the uterine lining) through mandatory surveillance, such as biopsies. Findings from these studies informed the dose and regimen studied for the intended endometrial effect.

Key Studies & References

  1. PACKAGE LEAFLET: INFORMATION FOR THE USER Femoston® 1/10mg and Femoston® 2/10 mg
  2. Impact of low and ultra-low dose estradiol and dydrogesterone on health-related quality of life of postmenopausal women: outcomes from two Phase 3 studies
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Frequently Asked Questions (FAQ)

Common questions about Femoston 1 (FAQ)


Q: How long does it typically take to feel any changes after starting Femoston 1?

According to general guidance on hormone replacement therapy (HRT), it may take time for postmenopausal symptoms to fully improve. General patient guidance suggests that it may take up to three months of treatment before the full benefits of the medication are observed.


Q: Can Femoston 1 help with mood swings during menopause?

Femoston is prescribed to relieve postmenopausal symptoms, and hormone replacement therapy (HRT) is often associated with the alleviation of neurological symptoms related to menopausal changes. However, the official product information notes that common side effects can include psychiatric disorders such as nervousness and depression.


Q: Is Femoston 1 considered a continuous combined HRT?

Official documents classify Femoston 1 as a sequential combined hormone replacement therapy (HRT). This is a specific regimen where the estrogen component is taken every day, but the progestogen component is taken sequentially for part of each 28-day cycle.


Q: Are there common side effects that usually improve after the first few weeks?

Official safety data indicates that some common side effects are transient. Effects such as headaches, breast tenderness, and irregular vaginal bleeding often diminish or stop entirely within the first few months of beginning treatment.


Q: Does Femoston 1 interact with common supplements like St. John's Wort or melatonin?

The official product information specifically warns that the herbal supplement St. John's Wort (Hypericum perforatum) can interact with the hormones and decrease the effectiveness of the medication. Other common supplements like melatonin are not specifically addressed in regulatory documents.


Q: Is it possible to develop a rash or skin reaction from Femoston 1?

Skin reactions may occur as an undesirable effect of the medication. Hypersensitivity to the active substances or excipients is listed in official labeling as a contraindication (a reason not to use the medication).


Q: Are there any specific foods or drinks that should be avoided with this medicine?

There are no specific foods or drinks that regulatory documents state must be avoided when taking this medicine. Some general guidance related to menopausal symptom management mentions that adjusting the intake of substances like caffeine and alcohol may be observed to reduce hot flushes.


Q: Does Femoston 1 reduce the risk of osteoporosis?

Femoston 1 is officially indicated for the prevention of osteoporosis in postmenopausal women who are at high risk of future fractures and who are intolerant of, or contraindicated for, other established therapies.


Q: How long can a person continue to use Femoston 1?

Regulatory guidance advises that treatment should be started with the lowest effective dose for the shortest duration necessary. It is noted that sequential combined HRT is often used for several years, though the need for continued treatment is reviewed periodically by a healthcare provider.


Q: Can I use Femoston 1 if I am over 65 years old?

The medication can be used by women over 65, but official information notes that experience in this age group is limited. Furthermore, the HRT class, especially for women aged 65 and older, has been associated with an increased risk of probable dementia.


Q: Is Femoston 1 safe to use if I have a history of migraines?

The regulatory documents state that patients with a history of migraines or severe headaches require close supervision during treatment, as these conditions may recur or worsen. The official documentation also states that the new onset of a migraine-type headache is a reason to stop treatment immediately.


Q: Does Femoston 1 cause weight gain for most people?

Weight gain is listed in the official product information as a common side effect of Femoston 1. This means it is an effect observed in between 1 in 10 and 1 in 100 people using the medication.


Q: What is the specific meaning of the '1' in Femoston 1?

The '1' in the name Femoston 1 typically refers to the dose of the estrogen component, which is estradiol 1 mg. The full strength is often referenced in official documents as Femoston 1/10, which includes 1 mg of estradiol and 10 mg of dydrogesterone.


Q: Can I use alcohol while taking Femoston 1?

Official safety advice states that alcohol should be used with caution while taking this medicine. Separately, general guidance related to menopausal symptom management mentions that adjusting alcohol intake may be observed to reduce hot flashes.


Q: What are the official recommendations for regular check-ups while using Femoston 1?

Official warnings advise that patients should visit their doctor at least once a year to review the need for continued HRT. Regular screening for breast cancer (such as mammography) and other necessary checks are also officially recommended while using this product.


Q: What are the ingredients in the tablet that are not the active hormones?

The tablets contain several inactive ingredients, also known as excipients, in addition to the active hormones. These are listed in regulatory documents and include common pharmaceutical substances such as lactose monohydrate, maize starch, and various coating agents.


Q: Does Femoston 1 affect cholesterol levels?

Clinical study data referenced in regulatory documents describe changes in cholesterol profiles associated with the use of Femoston. Studies report a reduction in total cholesterol and LDL-cholesterol levels, while observing an increase in HDL-cholesterol and triglyceride levels.


Q: Can taking Femoston 1 increase the risk of developing gallstones?

Cholelithiasis, the formation of gallstones, is listed as a condition that requires close supervision during treatment. This is because official documents note that the condition may recur or be aggravated by this type of hormone therapy.


Q: Is it common to feel tired or fatigued when beginning treatment with Femoston 1?

Yes, tiredness and fatigue are listed in the official product information as common side effects of the medication. This means it is an effect observed in between 1 in 10 and 1 in 100 people using the medication.


Q: Does Femoston 1 cause changes to vision?

Changes in vision are noted as a serious side effect in regulatory documents. Regulatory warnings state that changes in vision require immediate medical attention.


Q: Can someone with diabetes use Femoston 1?

The product information states that patients with Diabetes mellitus (diabetes) require close supervision during treatment. This is because official warnings note that the condition may recur or be aggravated by the medication.


Q: Can Femoston 1 be used by people with controlled high blood pressure?

The product information states that individuals with Hypertension (high blood pressure) require close supervision during treatment with Femoston 1. Official documents note that this pre-existing condition may recur or be aggravated by the medication.


Q: Does Femoston 1 affect the results of blood tests?

Hormone Replacement Therapy can affect the results of certain laboratory tests. These include tests for thyroid function, coagulation, and lipid parameters, so it is important to inform laboratory staff and your doctor that you are taking this medicine.


Q: Does Femoston 1 affect sleep quality?

Clinical studies referenced in the regulatory context have measured the impact of Femoston on sleep quality. These studies describe patterns of improved sleep quality, which is consistent with the role of HRT in addressing menopausal symptoms.

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How should Femoston 1 be stored and disposed of?

How to Store and Dispose of Femoston 1/10

The storage and disposal instructions for Femoston 1/10 are based strictly on official regulatory labeling, ensuring the medicine remains stable and is discarded safely.

Storage Requirements

  • Temperature: Store the tablets at a temperature below 30°C or not exceeding 25°C, keeping them in a cool, dry place.
  • Protection: The tablets must be protected from light and moisture. Do not store them in environments prone to heat and dampness, such as a bathroom or near a window.
  • Container: Keep the medicine in its original blister pack and outer carton until the time of use; removing tablets prematurely may affect their stability.
  • Safety: The product must be stored out of the sight and reach of children.

Disposal Requirements

Expired or unused Femoston 1/10 must not be disposed of via household wastewater or general household trash. To comply with pharmaceutical waste protocols, patients should consult their pharmacist for instructions on how to return the product for proper disposal.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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