Viviant

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Viviant

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Viviant

Viviant is a specialized prescription medication intended for use in postmenopausal women, characterized by its unique pharmacological action within the body's hormonal systems.


Quick Facts: Viviant

Property Description
Active Ingredient Bazedoxifene (as Bazedoxifene acetate)
Form Oral tablet
Pharmacological Class Selective Estrogen Receptor Modulator (SERM)
Origin Synthetic, Nonsteroidal
Target Audience Postmenopausal women

What Type of Medicine is Viviant?

Viviant is classified as a Selective Estrogen Receptor Modulator (SERM). This pharmacological category is an Estrogen Agonist/Antagonist. The medication contains the active ingredient Bazedoxifene (INN), which is a synthetic, nonsteroidal compound. As an SERM, Bazedoxifene is designed to both stimulate and block estrogen receptors in different tissues, differentiating it from traditional hormone replacement therapies. This selective action makes it a clinically recognized option for women whose therapeutic needs involve selective hormonal modulation.


Viviant's Composition and Formulation

The medication is an oral tablet intended for systemic effects via the oral route of administration. The active component is Bazedoxifene, often formulated as Bazedoxifene acetate. When marketed as Viviant, it is a single product (monotherapy). The selective nature of the drug allows it to address concerns related to the use of estrogens alone, offering a balanced approach to hormonal modulation. Notably, the same active ingredient is also utilized in a related combination product (known as a Tissue-Selective Estrogen Complex or TSEC) along with conjugated estrogens.


How Bazedoxifene Selectively Interacts with the Body

Bazedoxifene works through selective modulation, targeting estrogen receptors to produce distinct effects in the body. It acts as a stimulator (agonist) in some tissues, such as the bone, to help mitigate the accelerated process of bone breakdown that commonly occurs after menopause. Concurrently, it acts as a blocker (antagonist) in sensitive tissues, such as the uterus. This dual action is crucial to its general therapeutic purpose of helping maintain bone strength while providing a specific benefit to postmenopausal women seeking alternatives to traditional hormone treatments.

What side effects are possible with Viviant?

Possible Side Effects and Safety Information

Adverse reactions associated with Bazedoxifene (Viviant) are categorized by regulatory authorities based on the frequency observed in clinical studies. The safety profile is defined by two key domains: frequent, typically less severe effects and serious, clinically significant events.

Adverse Reaction Scope

Classification Representative Side Effects (System-Organ Class)
Common (ge 1/100 to < 1/10) Musculoskeletal: Muscle spasms, including leg cramps. Gastrointestinal: Nausea, diarrhea, upper abdominal pain, dyspepsia. General: Hot flushes, peripheral edema, dizziness.
Uncommon (ge 1/1,000 to < 1/100) Vascular: Venous Thromboembolic Events (VTE), which includes Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE). Other: Pelvic pain, cholecystitis, tendonitis.

Serious Adverse Reactions and Safety Constraints

The most serious event documented in regulatory sources is the risk of Venous Thromboembolic Events (VTE). This risk is associated with the SERM pharmacological class and is a key constraint on use.

Regulatory safety statements explicitly Contraindicate the use of Viviant in women who have:

  • A current or past history of VTE or arterial thromboembolic disease (e.g., stroke, myocardial infarction).
  • Known hepatic impairment or disease.
  • Undiagnosed abnormal uterine bleeding.
  • Known or suspected estrogen-dependent neoplasia, including breast cancer.

Furthermore, the official label states that use is not recommended in women over 75 years of age or those with renal impairment, based on specific pharmacokinetic and fluid retention considerations, respectively.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Bazedoxifene (Viviant) overdose describes specific clinical manifestations and mandates immediate emergency action. Overdosage may present with symptoms that include nausea, vomiting, abdominal pain (stomach pain), dizziness, and tiredness (fatigue or drowsiness). Endocrine-related signs, such as breast tenderness and vaginal bleeding, have also been documented in association with overexposure to estrogen-containing products.

Regulators emphasize that immediate medical attention must be sought right away if overdosage is suspected. Contacting a poison control helpline is required for non-life-threatening overdosage. Furthermore, emergency services must be contacted if the individual has collapsed, has trouble breathing, has had a seizure, or cannot be awakened.

Treatment for Bazedoxifene overdose is officially defined as symptomatic and supportive. Regulatory documents explicitly state that no specific antidote is known for this medication. Consequently, medical intervention focuses on managing the manifestations of overdosage.

Therapeutic Uses of Viviant

What Viviant Treats: Main Uses and Benefits

Viviant is applied in addressing postmenopausal women with symptoms related to systemic imbalance that contribute to the risk of osteoporosis. The active ingredient is considered relevant for supporting postmenopausal osteoporosis in women where the condition presents with symptoms of increased neurological or muscular activity due to bone compromise. The medication supports patients by focusing on conditions marked by increased physiological stress, and it assists with maintaining functional stability for those concerned about fragility fractures.

This treatment provides supportive relief when symptoms interfere with routine activities, contributing to easing the overall symptom load by focusing on skeletal maintenance. Viviant may be part of symptomatic management for women presenting with conditions characterized by periods of heightened symptoms, such as osteopenia, where long-term skeletal support is appropriate. It is relevant for easing the heightened symptom of compromised skeletal strength and is commonly used across conditions presenting with systemic or localized discomfort.


Quick Fact: Relief for Skeletal Compromise
Therapeutic Role Support in managing the risk of symptoms that create noticeable physiological strain.
Typical Use Context Chronic, long-term preservation of skeletal health post-menopause.
Main Benefit Assists with maintaining functional stability during periods of risk.

Eligibility and Restrictions for Use

The eligibility for using Viviant (Bazedoxifene) is strictly defined by government regulatory documents and is limited to a narrow demographic with specific exclusions.

Eligibility Scope

Category Official Regulatory Status
Populations for whom use is allowed Postmenopausal women only
Populations for whom use is not recommended Women over 75 years of age; patients with severe renal impairment; premenopausal women (safety not established)
Populations for whom use is contraindicated Women of child-bearing potential; those with active or past thromboembolic events (VTE, stroke); hepatic impairment; history of breast cancer; undiagnosed uterine bleeding

Regulatory Classifications

Classification Official Regulatory Wording
Pregnancy and lactation eligibility Contraindicated in pregnancy; must not be used during breastfeeding
Eligibility-related restrictions Must be discontinued prior to and during prolonged immobilisation (e.g., post-surgery/bed rest)

These constraints establish mandatory non-eligibility for individuals with a history of blood clots, liver disease, or hormone-sensitive cancers. The official profile ensures the medicine is reserved solely for postmenopausal women and restricts use in specific populations where clinical data is limited or exposure is altered.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

The interaction profile of Viviant (Bazedoxifene) is primarily defined by how its concentration is altered by other substances, a process known as a pharmacokinetic interaction. The drug's metabolism occurs largely through UGT enzymes in the liver and intestine, and this pathway determines most of its known drug-drug interactions.

Contraindicated Combinations

Regulatory labeling establishes a formal restriction against co-administration with other hormonal agents. It is documented that Viviant must not be taken concurrently with additional estrogens, progestins, or other estrogen agonist/antagonists (SERMs).

Effects on Systemic Exposure

Interaction Type Examples of Interacting Substances Official Outcome on Viviant Exposure
UGT Inducers Rifampin, Phenytoin, Carbamazepine, Phenobarbital Reduction in Bazedoxifene exposure
CYP3A4 Inhibitors Itraconazole Increase in Bazedoxifene and Estrogen exposure

Co-administration with UGT-inducing substances is officially documented to accelerate Bazedoxifene's clearance, which reduces its concentration in the body. Conversely, strong CYP3A4 inhibitors are stated to increase systemic exposure. Furthermore, the herbal product St. John's Wort may reduce the concentration of the estrogen component.

Population-Specific Constraint

Official documents mandate that Viviant is contraindicated in women with known hepatic impairment or disease. This constraint is due to the documented risk of significantly impaired clearance, which leads to a substantial increase in the drug’s systemic exposure.

Mechanism of Action

Tissue-Selective Estrogen Receptor Modulation

The active ingredient, Bazedoxifene, functions as a Selective Estrogen Receptor Modulator (SERM) by targeting the nuclear Estrogen Receptors (ER). Bazedoxifene binding induces a unique conformational change in the receptor structure. This molecular event dictates a differential outcome, allowing the molecule to activate the receptor in some tissues while blocking it in others, defining the drug's tissue-selective scope of action.


Dual Physiological Cascade in Skeletal and Proliferative Tissue

Bazedoxifene exerts a dual physiological cascade: it is a functional agonist in the skeletal system, where ER activation suppresses the activity of osteoclasts (bone-resorbing cells), which physiologically results in modulation of the bone remodeling cycle. Simultaneously, the molecule acts as a competitive antagonist in tissues like the uterine lining, thereby inhibiting estrogen-driven cellular proliferation.


Mechanism Dependence on Local Protein Environment

The selective action of this mechanism is functionally dependent on the local cellular expression of co-activator and co-repressor proteins. These intracellular components dictate whether the drug-receptor complex activates or silences target genes. This dependence on the specific local protein environment determines the absence of ER activation in other sites, such as the Central Nervous System centers controlling vasomotor responses.

Dosage and Administration Information

This section provides instructions for the proper administration of the combination drug containing bazedoxifene 20 mg and conjugated estrogens 0.45 mg (often marketed as Duavee or Duavive).


Official Dosing and Route of Administration

Administration Detail Official Instruction
Dose One tablet daily (bazedoxifene 20 mg / conjugated estrogens 0.45 mg).
Route Oral. The tablet must be swallowed whole.
Frequency Once daily (qDay).

Administration Conditions and Procedure

The tablet must be taken orally and swallowed whole; the tablet should not be crushed, broken, or chewed. This medication may be taken with or without food.

  • Missed Dose: If a dose is missed, take it as soon as it is remembered. However, do not take two doses at the same time to make up for the missed dose; resume the regular schedule.

  • Concomitant Supplements: If taking the drug for the prevention of postmenopausal osteoporosis, supplemental calcium and/or vitamin D should be added to the diet if daily intake is inadequate.


Population-Specific Use Limitations

This drug is indicated exclusively for use in postmenopausal women who have a uterus. Use is generally not recommended in women over 75 years of age. Additionally, the use of this drug is not recommended in patients with renal impairment and is contraindicated in patients with hepatic impairment. Therapy should be discontinued during periods of prolonged immobilization and resumed only after the patient is fully ambulatory.

Recent Clinical Evidence

Viviant: Recent Clinical Evidence

Viviant, which contains bazedoxifene, is a selective estrogen receptor modulator (SERM) investigated for its role in bone health and managing certain postmenopausal symptoms. Research has explored how this medication may interact with estrogen receptors in the body, acting differently across various tissue types to address clinical endpoints.


Efficacy Findings in Osteoporosis

Phase 3 clinical trials, involving postmenopausal women with osteoporosis, evaluated the drug's effect on bone mineral density (BMD) and fracture risk. Studies reported a significant reduction in the incidence of vertebral fractures in the bazedoxifene 20 mg group compared to the placebo group. Analysis of five-year data documented sustained maintenance of BMD. However, clinical research has not established a definitive effect on the incidence of non-vertebral or hip fractures.


Safety Profile and Tolerability

The safety profile of bazedoxifene has been documented across multiple randomized, placebo-controlled trials. The majority of reported adverse reactions were generally mild to moderate in severity. The most frequently observed drug-related events in studies included nausea, hot flushes, and muscle spasms (including leg cramps).

Research indicates an increased risk of venous thromboembolic events (VTE), such as deep vein thrombosis and pulmonary embolism, compared to placebo, with the highest risk documented during the first year of participation. This finding aligns with observations related to other medications in the SERM class.


Combination Therapy

Clinical research has also investigated bazedoxifene in combination with conjugated estrogens for the treatment of moderate to severe vasomotor symptoms (hot flashes) associated with menopause, alongside the prevention of postmenopausal osteoporosis. Studies observed that this combination was associated with improvements in vasomotor symptoms while maintaining a neutral effect on endometrial and breast tissue, consistent with the drug's antagonist activity in those tissues.

Key Studies & References

  1. Efficacy of Bazedoxifene in Reducing New Vertebral Fracture Risk in Postmenopausal Women With Osteoporosis: Results From a 3-Year, Randomized, Placebo-, and Active-Controlled Clinical Trial

Frequently Asked Questions (FAQ)

Common questions about Viviant (FAQ)


Q: How quickly does Viviant start working after taking the first dose?

A: Viviant (Bazedoxifene) is taken once daily. Official regulatory data indicates that the drug's concentration in the body reaches a stable level, known as steady-state, by the second week of consistent, daily administration. This steady level is required for the drug's intended therapeutic effects, though the time to notice a clinical effect can vary.


Q: How long do the effects of Viviant typically last?

A: The effects of Viviant are designed to support once-daily administration. The active ingredient, Bazedoxifene, has a long elimination half-life of approximately 30 hours. This half-life is the time it takes for half the drug to be eliminated from the body.


Q: Why do some people say Viviant makes them feel tired?

A: Fatigue or general tiredness is not widely listed among the most common side effects in the official regulatory documents. However, some clinical trial data has reported instances of somnolence (drowsiness). If an individual experiences unexpected or severe symptoms, they should seek guidance from their healthcare provider.


Q: Is it normal to feel a slight headache when starting Viviant?

A: Official information does not consistently list a mild headache as a common side effect when starting this medication. However, any persistent or severe headache is often flagged in drug labels as a symptom that warrants consulting a healthcare provider. Individuals should seek guidance from their healthcare provider for any persistent or severe symptoms.


Q: Is Viviant known to cause weight gain or loss?

A: Official regulatory documents categorize common and uncommon side effects based on clinical trial data. Neither weight gain nor weight loss are listed among the reported common or uncommon adverse reactions for Viviant.


Q: Is there a generic version of Viviant available?

A: Viviant contains the active ingredient Bazedoxifene. The availability of a generic version depends on regulatory approvals and the expiration of patents, which varies by region. Individuals should check with their local pharmacy or regulatory body for the current status of generic Bazedoxifene products.


Q: How often should blood work be checked while on Viviant?

A: While the drug label does not specify the exact frequency of blood tests, it does advise patients to have regular screenings. Official patient counseling information recommends adhering to the schedule for routine pelvic exams, breast exams, and mammograms as determined by one's healthcare provider.


Q: Do people with kidney or liver issues need an adjusted dose of Viviant?

A: Official regulatory information provides strict limitations on the use of Viviant in people with organ impairment. The drug is contraindicated (must not be used) in women with hepatic impairment (liver disease) and is generally not recommended for those with severe renal impairment (kidney issues).


Q: Can Viviant be taken long-term without major risks?

A: Clinical trials used to study Viviant’s safety and effectiveness have evaluated patients for extended periods, with some data available for up to 7 years of use. The drug's official safety profile, based on long-term studies, highlights that the risk of venous thromboembolic events (VTE), such as blood clots, remains a safety consideration throughout the treatment duration.


Q: Are there different forms of Viviant (tablet, liquid, extended-release)?

A: According to the official product information and pharmaceutical form descriptions, Viviant is supplied only as a film-coated oral tablet.


Q: Can children or teenagers take Viviant, and if so, under what circumstances?

A: Official product information states that Viviant is indicated only for use in postmenopausal women. The safety and effectiveness of the medication have not been established in children, adolescents, or premenopausal women.


Q: Are there any studies looking at the long-term safety profile of Viviant?

A: Yes, regulatory information includes clinical data on the safety profile of Viviant from studies that continued for as long as 7 years. This long-term research contributes to the established safety warnings and contraindications.


Q: Is it normal to experience vivid dreams while taking Viviant?

A: Vivid dreams are not listed as a common or uncommon adverse reaction in the official regulatory documents for Viviant.


Q: Can Viviant affect blood pressure or heart rate?

A: Official documents list hypertension (high blood pressure) as a possible serious side effect associated with the medication. However, changes to heart rate are not commonly reported or highlighted in the official adverse reaction summaries.


Q: Is Viviant metabolized differently in men versus women?

A: Viviant is intended and studied exclusively for use in postmenopausal women. Regulatory documents do not contain information on how the drug is metabolized in men.


Q: Does Viviant cause dry mouth or changes in taste?

A: Official safety data confirms that dry mouth has been reported as a common adverse reaction associated with Viviant. However, changes in the ability to taste are not specifically listed as a common or uncommon side effect.


Q: How does Viviant affect the immune system?

A: Regulatory documents do not provide a detailed description of how Viviant directly affects the immune system. However, the safety profile does include reports of hypersensitivity reactions as an uncommon adverse event.


Q: How long after stopping Viviant does it completely leave the system?

A: The active ingredient in Viviant, Bazedoxifene, has an elimination half-life of approximately 30 hours. This means it takes approximately 30 hours for half of the drug to be cleared from the bloodstream.

How should Viviant be stored and disposed of?

How to Store and Dispose of Viviant?

Official regulatory documents define specific storage and disposal requirements for Viviant (bazedoxifene) tablets to ensure the product's stability and proper handling.


Storage Requirements

  • Temperature and Protection: The medication must be stored at a temperature below 30 C (86 F) and kept protected from light and moisture.
  • Packaging: Tablets must remain in the original blister packaging until immediately before use to maintain integrity.
  • Child Safety: Viviant must be kept out of the sight and reach of children.

Disposal Instructions

  • Environmental Rule: Unused or expired tablets must not be disposed of via wastewater or household waste.
  • Handling: Patients are instructed to ask a pharmacist for guidance on how to properly discard any medicine they no longer need.

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

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