Tibolon

Quick links to important sections

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.

Overview of Tibolon

Property Description
Active ingredient Tibolone
Form Tablet
Pharmacological class Hormone Replacement Therapy (HRT) agent
General purpose Addresses symptoms related to postmenopausal hormone deficiency
Origin Synthetic steroid

What Type of Medicine is Tibolon?

Tibolon (INN: Tibolone) is a specialized synthetic steroid hormone drug classified within the field of Hormone Replacement Therapy (HRT). It is a chemically manufactured, synthetic organic compound that acts as an agonist at multiple steroid hormone receptors. Its classification is unique: pharmacological studies have established its specific role as a compound for managing symptoms in postmenopausal women. This compound’s distinct profile has led to its characterization as a Selective Tissue Estrogenic Activity Regulator (STEAR), which functionally differentiates it from conventional HRT regimens. Tibolone is administered as a single-component product intended for oral use.

Composition and General Mechanism

The core of the medicine is its single active ingredient, Tibolone, delivered in the form of a solid tablet. Tibolone itself functions as a prodrug; it is rapidly converted into three primary active substances within the body—3alpha-hydroxytibolone, 3beta-hydroxytibolone, and the Delta4-isomer of tibolone. These active substances collectively provide triphasic activity, encompassing estrogen-like, progestogenic, and androgen-like effects. This particular balance is clinically recognized for its unique tissue-selective effects compared to traditional combined therapies. This characteristic mechanism enables the medicine to primarily address the symptomatic consequences of the postmenopausal state by restoring a more regulated hormonal environment.

Regulatory References

  1. Tibolone - LiverTox - NIH

What side effects are possible with Tibolon?

Tibolon: Possible side effects and safety information

Serious and Clinically Significant Risks

Regulatory documentation highlights several serious risks associated with Tibolon use, which must be considered during the benefit-risk assessment. These risks generally increase with age and duration of use.

  • Stroke: There is an increased relative risk of stroke (mainly ischaemic), particularly in women over 60 years of age, with the elevated risk becoming apparent from the first year of use.
  • Venous Thromboembolism (VTE): The risk of developing VTE (deep vein thrombosis and pulmonary embolism) is generally increased.
  • Cancer Risks: Tibolon is associated with an increased risk of endometrial cancer (in women with an intact uterus) and an increased risk of breast cancer (which increases with longer-term use and is often contraindicated in women with a history of the disease).
  • Contraindications: Use is strictly prohibited in cases of known or suspected breast cancer, estrogen-dependent malignancies, undiagnosed genital bleeding, untreated endometrial hyperplasia, and history of thromboembolic disorders (VTE, stroke, or myocardial infarction).

Common Adverse Reactions and Other Safety Notes

Commonly reported adverse reactions (occurring in 1–10% of users) primarily involve the reproductive system and skin, including vaginal bleeding or spotting, breast tenderness, weight gain, abdominal pain, acne, and hirsutism (unnatural hair growth).

Treatment requires continuous risk re-evaluation and should be for the shortest duration consistent with therapeutic goals. Regular safety monitoring includes investigating any persistent vaginal bleeding or spotting that occurs after the first six months of use or that starts after treatment has been established. The drug is exclusively for postmenopausal women and is contraindicated during pregnancy and breastfeeding.

Overdose and Emergency Response

Overdose and when to seek help

This information is based strictly on descriptions and procedures documented in official government regulatory prescribing information.


Overdose Scope

The official regulatory documentation states that the acute toxicity of Tibolone is considered very low. Consequently, toxic symptoms are not expected to occur even following the acute ingestion of a dose exceeding the normal therapeutic amount.

Documented manifestations of acute overdose, as listed in the product label, may include gastrointestinal distress such as nausea and vomiting. Furthermore, withdrawal bleeding (or vaginal bleeding) has been reported to occur in females as a delayed physiological manifestation.


Emergency Actions Mandated by Regulators

In the event of a suspected overdose, patients must seek immediate medical attention. This action is required for necessary assessment and management.

Antidote and Treatment:

The prescribing information formally states that no specific antidote is known for Tibolone overdose. The standard procedural instruction for management is to provide symptomatic and supportive treatment, if clinically required.

No specific population-based considerations regarding increased overdose severity (e.g., in hepatic impairment) are explicitly documented in the official overdose sections.

Therapeutic Uses of Tibolon

Quick Facts on Tibolon's Uses

  • Addressing moderate to severe symptoms associated with menopause.
  • Supporting bone mineral density in postmenopausal women with elevated fracture risk.
  • Intended for women who are intolerant of or have contraindications to other approved therapies for osteoporosis prevention.

Tibolon is an approved therapeutic option used in women who are more than one year post-menopause. The primary role of this medication is to manage the discomforts related to the natural or surgical cessation of ovarian function by providing a form of hormonal support.

Clinical experience indicates that Tibolon may help relieve moderate to severe manifestations of estrogen deficiency. These manifestations commonly include hot flashes (vasomotor symptoms), concerns with vaginal comfort, and disturbances in sleep. By acting on relevant tissues, the medication assists in mitigating these postmenopausal complaints.

Additionally, Tibolon has a role in supporting bone health. It is available as a second-line therapy for the prevention of bone thinning (osteoporosis) in postmenopausal women who carry a heightened risk of future fractures and who cannot tolerate or should not use other approved preventive medications. The decision to commence use of Tibolon should always be based on an individual risk assessment with a healthcare provider.

Eligibility and Restrictions for Use

Tibolon is officially indicated for postmenopausal women and is subject to strict eligibility rules defined by government regulatory authorities. Use is permissible only for women who are more than one year past their last natural menstrual period. Women who have undergone surgical menopause may start treatment immediately.

Populations for whom use is contraindicated

Absolute prohibition applies to several groups due to hormonal cancer risks and thromboembolic history. Tibolon must not be used by women who are pregnant or breastfeeding, or who have a known, past, or suspected history of breast cancer or other estrogen-dependent malignant tumors. It is also contraindicated in patients with a history of venous thromboembolism (DVT, PE), arterial thromboembolic disease (e.g., stroke), or acute liver disease [Source 1.1, 1.3, 4.4].

Conditional Use and Restrictions

  • Age-Related: Use is not applicable in the pediatric population. For women over age 60, the prescribing decision must include careful consideration of the increased risk of stroke [Source 1.3, 3.4].
  • Organ Function: It is contraindicated if liver function tests have failed to return to normal. No specific dose adjustment is typically needed for renal impairment [Source 4.1].

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Tibolon documents clinically significant interactions primarily related to hepatic enzyme metabolism and pharmacodynamic effects, requiring specific management constraints.


Documented Pharmacokinetic Interactions

The co-administration of medicinal products that are potent CYP3A4 enzyme inducers can compromise the effectiveness of Tibolon. Enzyme inducers, including the antituberculosis drug Rifampicin and the anticonvulsants Carbamazepine and Phenytoin, cause a pharmacokinetic interaction. This is officially described as leading to a decreased systemic exposure of Tibolon's active metabolites and, consequently, a reduction in its expected therapeutic efficacy. The herbal product St John's Wort is also documented as an enzyme inducer that is expected to reduce effectiveness in the same manner.

Pharmacodynamic Interactions and Restrictions

  • Anticoagulants: Co-administration with anticoagulants like Warfarin or Acenocoumarol may enhance the anticoagulant activity. Regulatory labels state that this pharmacodynamic effect requires close monitoring of coagulation status (e.g., INR) to manage potential changes.
  • Hormonal Restriction: The official regulatory labels impose a formal restriction on hormonal co-administration: a separate progestogen should not be added to the Tibolone regimen under any circumstances.
  • Administration Constraint: Some regulatory guidance notes that an administration constraint exists where taking the medicine with food can affect how the medicine works.

Mechanism of Action

Tibolone is a synthetic steroid that functions as a Selective Tissue Estrogenic Activity Regulator (STEAR).

Following absorption, it is rapidly metabolized into three primary active metabolites: 3alpha-hydroxytibolone, 3beta-hydroxytibolone, and Delta4-tibolone. These compounds interact with a range of steroid hormone receptors, including estrogen receptors (ERs), progesterone receptors (PRs), and androgen receptors (ARs).

The parent compound and its metabolites differentially modulate the activity of key steroid-converting enzymes, such as sulfatase and 17beta-hydroxysteroid dehydrogenase (17beta-HSD). This tissue-specific modulation of receptor binding and enzyme activity leads to the differential activation of target genes.

In osteal tissue, the mechanism involves altering the expression of genes associated with osteoclastogenesis and bone resorption. In cerebral tissue, the mechanism involves affecting neurotransmitter signaling within the hypothalamic thermoregulatory center.

Dosage and Administration Information

How to Use Tibolon

Tibolone is utilized as a continuous hormonal regimen for postmenopausal therapy. The medicine is consistently prescribed as an oral tablet for daily intake.


Dosing and Frequency

The standard prescribed dose is one 2.5 mg tablet per day, taken orally. This fixed dose is maintained throughout the entire course of treatment, establishing a continuous schedule without mandated breaks or cycles. For consistency, the tablet should be swallowed whole with water or another drink, and preferably taken at the same time each day. The medication may be taken with or without food, as absorption is generally consistent.

Treatment Initiation and Duration

Treatment initiation is dependent on the patient’s menopausal status. For women who have undergone a natural menopause, therapy should only commence at least 12 months after the last natural menstrual bleed. Following surgical removal of the ovaries, treatment may begin immediately. The overall guiding principle for continuation is the use of the lowest effective dose for the shortest necessary duration, which should be periodically reviewed by a healthcare provider.


Special Administration Rules

Feature Instruction
Missed Dose Take as soon as remembered, unless it is more than 12 hours overdue. If overdue by >12 hours, skip the dose and take the next at the usual time; do not double the dose.
Progestogen Use A separate progestogen should not be added to the Tibolone regimen.
Elderly No dose adjustment is typically necessary for elderly patients.

Recent Clinical Evidence

Tibolon: Recent Clinical Evidence

Tibolon is a synthetic steroid primarily indicated for the treatment of vasomotor symptoms (e.g., hot flashes) and vaginal atrophy associated with menopausal estrogen deficiency. It acts as a tissue-selective estrogenic, progestagenic, and weak androgenic agent, which contributes to its unique clinical profile.


Efficacy in Menopausal Symptoms

Clinical trials consistently report that tibolon is associated with improvements in both the frequency and severity of vasomotor symptoms. Studies have indicated that the efficacy in reducing hot flashes is comparable to conventional hormone therapy (HT). For genitourinary symptoms, tibolon has demonstrated effectiveness in treating symptoms of vaginal and vulvar atrophy, potentially improving sexual function parameters reported by patients.


Effects on Bone Health

Research has shown that tibolon is associated with the prevention of bone mineral density (BMD) loss in postmenopausal women. The effects of tibolon on BMD are comparable to standard estrogen-progestin regimens. Further data suggests that tibolon is associated with a reduction in the incidence of vertebral and non-vertebral fractures in women with postmenopausal osteoporosis.


Cardiovascular and Endometrial Safety

Observed outcomes related to cardiovascular health show mixed results, with some trials suggesting a potential increase in the risk of stroke, particularly in women over 60 years of age, though other studies on coronary heart disease are inconclusive. Importantly, tibolon's unique mechanism avoids stimulating the endometrium in the same way as conventional HT. Clinical data indicates that tibolon is generally associated with a low risk of endometrial hyperplasia or carcinoma, reducing the need for cyclical progestin when compared to estrogen-only treatments.

Frequently Asked Questions (FAQ)

Common questions about Tibolon (FAQ)


Q: How is Tibolon different from traditional estrogen-only therapies?

A: Tibolon is distinct because it is classified as a Selective Tissue Estrogenic Activity Regulator (STEAR). The active components of the medicine provide a unique balance of three types of activity—estrogenic, progestogenic, and weak androgenic. This combination allows for selective action on different tissues in the body, which is a key difference from using estrogen alone.


Q: What happens if I stop taking Tibolon suddenly?

A: Official information indicates that if a person is considering discontinuing Tibolon, it is important to consult a healthcare provider. This is because stopping the medicine abruptly may result in the return of menopausal symptoms.


Q: How long does it typically take to start feeling the effects of Tibolon?

A: Regulatory guidance indicates that some symptom improvement may be noticed early in the treatment course. However, the official product information notes that the medicine can take up to three months to achieve its full therapeutic effect in relieving menopausal symptoms.


Q: Can Tibolon affect my mood or cause anxiety?

A: Official labels do not typically list anxiety as a common adverse effect. The drug does have hormonal activity that can influence the central nervous system, and its impact on mood and well-being has been investigated in clinical studies.


Q: Does Tibolon have any known interactions with herbal supplements like St. John's Wort?

A: Yes, regulatory documents specifically warn about the herbal product St. John’s Wort. This supplement can act as a potent enzyme inducer, which means it may speed up the body's breakdown of Tibolon's active components. This interaction can potentially decrease the medicine's effectiveness.


Q: Can Tibolon be used if you have a history of endometriosis?

A: Official medical information states that conditions such as a history of endometriosis or uterine fibroids require close supervision during treatment with Tibolon. This is because these conditions may potentially recur or be aggravated by hormonal treatments.


Q: Does research indicate that Tibolon affects sleep quality?

A: Official patient information notes that managing lifestyle factors like reducing alcohol and caffeine may help improve sleep. Since Tibolon is indicated to reduce disruptive vasomotor symptoms like hot flashes and night sweats, managing these symptoms may improve overall sleep quality.


Q: Is it safe to drink alcohol while using Tibolon?

A: Official patient information generally states that a person can drink alcohol while taking Tibolon. However, for better management of symptoms like flushing and to promote better sleep, official patient information suggests that reducing alcohol intake may aid in managing menopausal symptoms.


Q: Is Tibolon approved for use in men?

A: No. Official regulatory documents clearly indicate that Tibolon is indicated and approved exclusively for the use of postmenopausal women for the treatment of estrogen deficiency symptoms and related conditions.


Q: Does Tibolon require a prescription in most countries?

A: Yes. As a specialized steroid hormone replacement therapy, Tibolon is consistently classified as a prescription-only medicine across all major global regulatory jurisdictions.


Q: Is Tibolon available in different dosages?

A: The standard dose prescribed and approved by regulatory bodies is typically available in one strength. The standard and most commonly prescribed strength is used for continuous treatment in postmenopausal women.


Q: Can women with diabetes safely use Tibolon?

A: Official regulatory documents list a history of diabetes mellitus (whether or not blood vessels are affected) as a condition that requires close supervision during the course of treatment with Tibolon.


Q: What is the relationship between Tibolon and triglyceride levels?

A: Official documents note that patients with high blood levels of fat (hypertriglyceridemia) require supervision while taking this medicine. Tibolon has been associated with changes in lipid metabolism, and high blood levels of fat require supervision during treatment.


Q: Does taking Tibolon cause any changes in vision?

A: While vision changes are not a common side effect, official documents advise that treatment should be stopped if a person experiences a new onset of a migraine-type headache. Official documentation advises seeking medical attention for any sudden or concerning changes in vision.


Q: What is the difference between Tibolon and a combined HRT pill?

A: Tibolon is a single, synthetic steroid compound that exhibits a balance of estrogenic, progestogenic, and androgenic actions in the body. In contrast, a combined HRT pill typically contains two distinct hormones (an estrogen and a progestin) delivered together in a set ratio.


Q: Is Tibolon used for the prevention of any long-term conditions?

A: Yes. Tibolon is officially indicated for the prevention of osteoporosis (bone thinning) in postmenopausal women. This indication is primarily for women who are considered to be at a high risk of future fractures.


Q: What kind of monitoring is typically required while taking Tibolon?

A: Official documents require periodic medical check-ups both before and during treatment to assess overall risks and benefits. This monitoring often involves regular examinations of the breasts and pelvic area, and may include other relevant investigations like mammography.


Q: Does Tibolon affect the results of blood tests?

A: Yes. The medicine can influence the results of certain laboratory tests, particularly those related to lipid metabolism (e.g., triglycerides) and factors involved in blood clotting (coagulation/fibrinolysis). A healthcare provider is needed to interpret these results in context.

How should Tibolon be stored and disposed of?

How to Store and Dispose of Tibolone

Storage and disposal instructions for Tibolone tablets are governed by regulatory labeling to ensure product stability and safety.

Storage Requirements

Tibolone must be stored out of the sight and reach of children and kept in its original package to protect from light and moisture. Storage temperature requirements vary by formulation; some labels specify Do not store above 25 C, while others note no special temperature conditions are required. The product must not be used after the expiry date printed on the packaging.

Disposal Instructions

Unused or expired Tibolone should not be disposed of via wastewater or household waste. The medicine and any associated waste material must be discarded in accordance with local requirements. Patients should consult a pharmacist for guidance on disposing of medicines that are no longer needed.

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

Available in countries:

Equivalent of Tibolon found in:

A-Z Index: