Addyi

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Addyi

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Medically reviewed

Marina Burgos

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 Addyi

Quick Facts

Property Description
Active Ingredient Flibanserin
Form Oral Tablet
Pharmacological Class Multifunctional Serotonin Agonist and Antagonist (MSAA)
General Purpose Modulation of sexual desire-regulating neurotransmitters
Origin Synthetic compound
Differentiating Feature Non-hormonal, prescription-only CNS agent

Core Identity and Composition

The medication Addyi is the commercial trade name for the active chemical ingredient flibanserin, a synthetic compound provided as an oral tablet. Flibanserin is defined as a single-ingredient, non-hormonal pharmaceutical preparation, distinguishing its therapeutic approach from hormonal treatments. This prescription-only (Rx) medication is designed for systemic absorption and action, targeting the central nervous system (CNS).

Pharmacological Classification and Type

Flibanserin is pharmacologically classified as a Multifunctional Serotonin Agonist and Antagonist (MSAA), placing it within the broader group of CNS agents. This classification is supported by pharmacological studies that detail its unique receptor-binding profile. The substance's dual-acting mechanism involves agonist activity on the 5-HT1A receptor while simultaneously acting as an antagonist on the 5-HT2A receptor. This complex action establishes it as a specialized serotonin modulator.

General Therapeutic Purpose

The general therapeutic purpose of Addyi is to influence the neurochemical balance that regulates sexual motivation and interest in premenopausal women. Flibanserin's MSAA action helps to modulate the levels of Serotonin, Dopamine, and Norepinephrine in specific regions of the brain. This neurochemical adjustment provides a central nervous system strategy to help restore the equilibrium between signals of sexual inhibition and excitation. The medication is clinically recognized for its role in supporting the psychological drivers of sexual desire.

What side effects are possible with Addyi?

Possible Side Effects and Safety Information

The safety profile for flibanserin is characterized by reactions primarily affecting the Central Nervous System (CNS) and Vascular system, as documented in official regulatory labeling. These effects are classified according to incidence observed in premenopausal women in clinical trials.


Adverse Reactions and Frequency

The most Common adverse reactions, defined as occurring in two percent or more of patients, include dizziness, somnolence (sleepiness), nausea, fatigue, insomnia, and dry mouth. Other documented reactions include constipation, abdominal pain, and accidental injury.

System-Organ Class Common Adverse Reactions
Nervous System Dizziness, Somnolence, Insomnia, CNS Depression
Gastrointestinal Nausea, Dry mouth, Constipation, Abdominal pain
Vascular Hypotension, Syncope

Serious Safety Considerations

The most serious documented safety risks are Severe Hypotension (low blood pressure) and Syncope (fainting). Regulatory authorities have established strict constraints to manage these risks, including the documentation of Hypersensitivity reactions, such as anaphylaxis and angioedema. The risk of hypotension, syncope, and CNS depression is explicitly stated to be increased if the medication is taken during waking hours.


Safety Restrictions (Contraindications)

Flibanserin is formally Contraindicated in specific clinical situations due to the critical risk of severe hypotension and syncope:

  • Use with alcohol.
  • Use with moderate or strong CYP3A4 inhibitors (certain medicines).
  • Use in patients with any degree of hepatic impairment (liver impairment).

Flibanserin is not indicated for use in men or in postmenopausal women, as efficacy has not been established in these populations.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for an overdose of flibanserin (Addyi) is primarily defined by severe cardiovascular and central nervous system (CNS) manifestations. Documented presentations include severe hypotension (abnormally low blood pressure) and syncope (fainting or loss of consciousness). Overdose is also associated with CNS depression, which may manifest as somnolence or severe sedation. In documented severe cases, particularly accidental pediatric ingestion, respiratory depression and symptoms resembling Serotonin Syndrome have been observed.

Emergency medical attention is formally required when specific signs appear. Regulatory guidance states that if symptoms of pre-syncope (such as dizziness or lightheadedness) persist after the patient immediately lies supine, medical help must be promptly sought. Immediate medical attention is also required for serious, life-threatening allergic reactions such as angioedema or anaphylaxis.

In the event of an overdose, management is solely symptomatic and supportive treatment, as no specific antidote for flibanserin is known to exist. Severe outcomes necessitating hospitalization and continuous observation have been documented. Furthermore, the risk of severe hypotension and syncope is officially noted to be significantly increased in individuals with hepatic impairment.

Therapeutic Uses of Addyi

What Addyi Treats: Main Uses and Benefits

This medication is commonly used to help with the management of Hypoactive Sexual Desire Disorder (HSDD), a condition involving a persistent and recurrent deficiency in sexual desire and fantasies. It is relevant in conditions characterized by periods of heightened symptoms of low desire in adult premenopausal women, applied in scenarios where the lack of motivation is acquired and not due to external factors. The medication's role is applied in addressing symptom clusters that may become intense or disruptive to personal comfort.

The treatment is relevant for easing the personal distress that is commonly used to help with symptoms that interfere with daily comfort. This focus supports the patient during difficult episodes by easing distress and reducing the emotional burden associated with the condition. The treatment may assist with an improvement in satisfying sexual events (SSEs), contributing to easing the overall symptom load.

The treatment is commonly used to help with conditions involving acquired, generalized HSDD and the associated personal distress. This provides supportive relief when symptoms interfere with routine activities.


Quick Fact: Relief for Low Sexual Desire

Property Description
Main Therapeutic Focus Hypoactive Sexual Desire Disorder (HSDD)
Symptom Focus Deficiency in sexual desire and fantasies
Patient Focus Adult, premenopausal women
Supportive Goal Easing associated personal distress and promoting functional stability

Regulatory References

  1. NIH MedlinePlus Drug Information on Flibanserin

Eligibility and Restrictions for Use

Who Can and Cannot Use Addyi?

Eligibility for flibanserin (Addyi) is strictly defined by regulatory labeling, focusing on patient status and specific health risks. The medication is indicated only for adult premenopausal women diagnosed with acquired, generalized Hypoactive Sexual Desire Disorder (HSDD) that is not caused by other conditions or medications.


Absolute Contraindications (Must Not Use)

Addyi is contraindicated and must not be used in the following populations due to the high risk of severe hypotension and syncope (fainting):

Category Restriction
Organ Function Patients with any degree of hepatic impairment (liver problems).
Drug Interactions Patients using concomitant moderate or strong CYP3A4 inhibitors.
Substance Use Patients who consume alcohol close to the time of dosing.
Hypersensitivity Patients with known hypersensitivity to the drug or its components.

Populations Where Use is Not Established

Regulatory documents state that safety and efficacy have not been established or the medicine is not indicated for:

  • Men
  • Postmenopausal women
  • Pediatric patients (under 18 years of age)
  • Geriatric patients (older adults)

Additionally, use is not recommended for women who are nursing or breastfeeding.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for flibanserin (Addyi) is defined by pharmacokinetic and pharmacodynamic interactions that result in critical administration constraints. The most severe restrictions are due to the drug's metabolism primarily via CYP3A4 and CYP2C19 enzymes, and its activity as a P-glycoprotein (P-gp) blocker.

Contraindicated Combinations and Substances

Co-administration with alcohol (ethanol) is strictly contraindicated due to the high risk of severe adverse reactions, including hypotension and syncope. Flibanserin is also contraindicated with moderate or strong CYP3A4 inhibitors (e.g., ketoconazole, fluconazole), as these agents significantly increase flibanserin plasma concentrations, heightening the risk of severe hypotension.

Exposure-Altering Interactions

Substance Category Outcome Restriction
Strong CYP3A4 Inducers (e.g., rifampin, St. John's wort) Substantial reduction in flibanserin exposure Use not recommended
Grapefruit Juice Increases flibanserin exposure (AUC 40%) Restricted from co-administration
P-gp Substrates (e.g., digoxin) Increased substrate plasma concentrations Caution/monitoring required

Mandatory Timing Rules

Specific time-separation rules are mandatory to mitigate interaction risks. If a scheduled dose of flibanserin is missed due to alcohol consumption, the dose must be skipped. If a moderate or strong CYP3A4 inhibitor is initiated, flibanserin must be discontinued at least two days prior. Conversely, at least two weeks must elapse after discontinuing the inhibitor before initiating flibanserin.

Mechanism of Action

Mechanism of Action: How Addyi Works

Dual Modulation of Central Serotonin Receptors

Flibanserin works by acting simultaneously on two central serotonin receptors: as an agonist on 5 HT1 A receptors and an antagonist on 5 HT2 A receptors. This dual activity within the brain's regulatory circuits initiates the core mechanistic change by modifying the inhibitory signals carried by serotonin (5 HT).

Rebalancing Excitatory and Inhibitory Neurotransmitters

The drug's action on serotonin receptors triggers a cascade that leads to the effective increase of dopamine (DA) and norepinephrine (NE), while decreasing the effective 5 HT concentration in key brain regions. This shift adjusts the relative balance between inhibitory and excitatory monoamine systems.

Impact on Central Motivation and Reward Circuits

This neurochemical rebalancing directly influences the central motivation and reward pathways by lowering the overall neural inhibition. The resulting physiological effect is a central attenuation of inhibition and a relative increase in signaling within pathways associated with motivation.

Dosage and Administration Information

How to Use Addyi — Official Administration Guidelines

Administration of flibanserin (Addyi) is governed by specific, procedural instructions, which dictate the correct administration route, dosage, frequency, and duration of use.


Administration Scope

Instruction Detail
Route of administration Oral administration (by mouth), as a tablet.
Dosing schedule A fixed dose of 100 mg per day.
Timing in relation to meals Can be taken with or without food.
Special procedural condition The dose must be taken strictly at bedtime.

Procedural and Population Constraints

The usage protocol for flibanserin includes specific steps for non-adherence, dietary interactions, and time-based assessment.

  • Missed-Dose Rules: If the bedtime dose is missed, the patient must skip the missed dose and take the next dose at the next scheduled bedtime; the dose should not be doubled.
  • Administration Constraints: Patients are instructed to avoid grapefruit and grapefruit juice while using the medication. Furthermore, the official instructions include a protocol regarding concomitant alcohol consumption.
  • Course Duration: Treatment is generally discontinued after 8 weeks if the patient does not report an improvement in the condition.
  • Population Restrictions: The medication is not indicated for use in geriatric patients (age 55 or older) and is contraindicated in patients with any degree of hepatic impairment (liver problems).

The combination of a fixed 100 mg oral dose and mandatory bedtime timing defines the essential administration pattern, and this structure is supplemented by procedural constraints that govern co-consumption and the criteria for discontinuation after 8 weeks.

Recent Clinical Evidence

Research evidence / Overview of studies for Addyi

Research Evidence for Acquired HSDD in Premenopausal Women

Research exploring flibanserin has focused primarily on adult premenopausal women diagnosed with Acquired, Generalized Hypoactive Sexual Desire Disorder (HSDD). Studies conducted during periods of increased symptom activity examined patient-reported experiences related to this condition, which is characterized by a persistent lack of sexual desire not caused by medical conditions, relationship issues, or other factors.

The core clinical evaluation involved pivotal Randomized, Double-Blind, Placebo-Controlled Trials (RCTs). These trials typically lasted about 24 weeks and compared flibanserin against a placebo (an inactive substance), tracking patient-reported outcomes. Researchers monitored changes in the frequency of Satisfying Sexual Events (SSEs) per month and outcomes describing episodic or acute changes in personal distress related to low sexual desire.

Studies reported that the average number of monthly Satisfying Sexual Events (SSEs) increased from the start in the observed groups, with a small numerical difference reported between the flibanserin group and the placebo group. Studies reported that scores monitoring personal distress associated with low desire showed a numerical shift across the groups, with a slightly larger change observed in the group receiving flibanserin. Research highlights that the magnitude of these reported numerical differences was generally described by regulatory reviews as modest or small.


Research Context for Use in Postmenopausal Women

Studies were also conducted to explore the use of flibanserin in naturally postmenopausal women with HSDD. This research involved at least one 24-week Randomized, Double-Blind, Placebo-Controlled Trial that studied the same key outcomes—frequency of Satisfying Sexual Events (SSEs) and changes in personal distress.

The findings were mixed across the study goals for this population. In one core trial, the predefined primary study endpoint related to Satisfying Sexual Events (SSEs) did not achieve the specific level of certainty required to distinguish it from the placebo. Research indicates that evidence is limited for this group compared to the premenopausal population, and the use of flibanserin is not an authorized indication by major governmental regulators specifically for postmenopausal women.


Research Gaps and Areas of Scientific Uncertainty

Despite the existence of multiple placebo-controlled RCTs, several research gaps and areas of scientific uncertainty remain. One key limitation is the modest magnitude of the numerical differences observed across the groups in the pivotal trials.

Because the follow-up durations were limited and the sample sizes were modest for long-term evaluation, the long-term patterns are not well characterized. Research helps show what has been observed so far, but findings describe group patterns, not personal outcomes, and they reflect the specific conditions under which they were conducted.

Key Studies & References

  1. A 28-week Safety Study of Flibanserin in Pre- and Postmenopausal Women With Hypoactive Sexual Desire Disorder (NCT01103362)

Frequently Asked Questions (FAQ)

Common questions about Addyi (FAQ)


Q: What is the difference between Addyi and drugs like Viagra?

Official information states that Addyi is a non-hormonal medication that works on neurotransmitters in the brain to address low sexual desire. Unlike drugs used for male sexual health, Addyi is not indicated to enhance sexual performance or affect blood flow to the genitals.

Q: Is Addyi the same as the 'female Viagra' I hear about?

According to regulatory documents, Addyi is a non-hormonal central nervous system (CNS) agent, meaning it works on brain chemicals to influence desire. It is not equivalent to, or indicated to function like, drugs that affect blood flow for physical response, which are sometimes called 'female Viagra' by the public.

Q: How long do I need to take Addyi before noticing a change?

The official product information indicates that the medication has a gradual onset of action and consistent use over time is important. Treatment should be discontinued if no improvement is reported after approximately 8 weeks of continuous use, which is the specified assessment period.

Q: Are there any foods or drinks I need to avoid while taking Addyi?

Official product information states that alcohol use is strictly contraindicated due to the risk of severe side effects. Additionally, official product information advises avoidance of grapefruit and grapefruit juice because they can increase the amount of the drug in the body.

Q: Does Addyi interact with antidepressants or anxiety medications?

Yes, official sources indicate potential interactions with medicines used to treat depression or anxiety. If these are classified as CYP3A4 inhibitors or other CNS depressants, they can dangerously increase Addyi levels, raising the risk of severe hypotension (very low blood pressure) and fainting.

Q: Why is Addyi taken only at bedtime?

The official administration instructions require that the dose be taken strictly at bedtime. This specific timing is mandatory because taking the dose during waking hours significantly increases the risk of serious side effects like hypotension (low blood pressure), fainting, and general central nervous system depression.

Q: Is Addyi known to cause stomach upset or nausea?

Yes, the official product information lists nausea as one of the most common adverse reactions experienced in clinical trials. Other commonly reported gastrointestinal effects include abdominal pain and constipation.

Q: Are there known interactions between Addyi and herbal supplements?

Official regulatory sources state that starting or taking any herbal supplements requires a prior consultation with a healthcare professional. This is due to the potential for certain supplements to significantly alter the drug's concentration in the body, which can increase the risk of side effects.

Q: Can Addyi interact with certain antifungal medications?

Yes, the medication is contraindicated (must not be used) with certain antifungal medications, including ketoconazole and fluconazole. These are classified as CYP3A4 inhibitors, which significantly increase the risk of dangerous side effects when combined with Addyi.

Q: Can Addyi be taken with blood pressure medications?

The official safety information notes that Addyi, by itself, carries a risk of hypotension (low blood pressure). Therefore, caution is required when it is combined with any other medications that also have the potential to lower blood pressure.

Q: Does Addyi work right away, or does it take time?

Studies and product information indicate that Addyi has a gradual onset of action, meaning effects are not immediate. Consistent daily dosing over a period of several weeks is required to achieve the potential measured benefits seen in clinical trials.

Q: Can Addyi be taken with birth control pills?

According to drug interaction data, oral contraceptives and other weak inhibitors of the CYP3A4 enzyme may be taken with Addyi. However, official information notes that this combination may increase the risk of some adverse reactions.

Q: Is Addyi used to treat low libido in all women?

Regulatory documents specify that Addyi is only indicated for premenopausal women with acquired, generalized Hypoactive Sexual Desire Disorder (HSDD). It is not approved for women whose low sexual desire is caused by other existing medical conditions or substance use.

Q: Does Addyi help with physical symptoms, or only desire?

The official indication states that the drug's purpose is to address low sexual desire and the distress associated with it. The medication is not indicated or approved to enhance physical sexual performance.

Q: What does 'low sexual desire' mean in relation to Addyi?

In the context of the drug's use for HSDD, low sexual desire is defined as a persistent lack of desire that causes marked distress or interpersonal difficulty. This lack of desire must not be due to a co-existing medical condition, substance use, or relationship problems.

Q: Does Addyi interact with common over-the-counter pain relievers?

Official drug information advises caution regarding medications that may affect blood pressure. Because Addyi carries a risk of hypotension (low blood pressure), certain over-the-counter pain relievers could interact. Consultation with a healthcare provider is recommended before initiating any new medications.

Q: What type of doctor usually prescribes Addyi?

According to the regulatory safety program, prescribers must be specially certified in the Addyi REMS Program before they can prescribe the medication. These certified prescribers often include gynecologists and primary care providers.

Q: Is Addyi considered a long-term treatment?

Regulatory documents indicate that Addyi is intended for long-term use for the management of HSDD. However, the treatment course must be discontinued after 8 weeks if the patient reports no improvement in their condition.

Q: Are there studies showing how many women respond to Addyi?

Research indicates that a numerically higher percentage of women using Addyi reported a clinically meaningful benefit compared to those receiving a placebo. For key endpoints, responder rates in clinical trials were often cited between 46% and 55% for women taking the drug.

Q: What is the required monitoring or testing when taking Addyi?

Official safety documentation states that patients require monitoring for adverse reactions, particularly hypotension (low blood pressure) and syncope (fainting). Specific monitoring is also required for patients who are slow metabolizers of the drug (CYP2C19 poor metabolizers).

Q: Can Addyi affect my ability to drive or operate machinery?

Yes, because the medication must be taken at bedtime, regulatory warnings state that due to the risks of somnolence (sleepiness) and dizziness, activities requiring mental alertness, such as driving or operating machinery, must be avoided for at least 6 hours after taking the dose.

Q: Does taking Addyi require any changes to my lifestyle?

Official constraints require strict avoidance of alcohol due to severe risk. Avoiding grapefruit products and exercising caution regarding activities that require mental alertness (due to the CNS effects) are also mandatory parts of the administration protocol.

Q: How does the FDA classify Addyi’s safety profile?

The FDA classifies the safety profile as requiring a Risk Evaluation and Mitigation Strategy (REMS) Program. This program is mandated to manage and communicate the serious risks of severe hypotension (low blood pressure) and syncope (fainting), particularly when the medication is combined with alcohol.

Q: Is Addyi a hormone replacement therapy?

Official documents clarify that Addyi is a non-hormonal prescription medication. It is classified as a Multifunctional Serotonin Agonist and Antagonist (MSAA) because it works by targeting certain neurotransmitters in the brain, distinguishing its approach from hormone replacement therapies.

Q: What happens if a woman accidentally takes more than the recommended dose?

Regulatory warnings state that taking a higher dose than recommended significantly increases the critical safety risks, including hypotension (low blood pressure) and syncope (fainting). Patients should seek immediate medical attention in the event of an overdose.

Q: Do the side effects of Addyi usually go away over time?

Evidence from clinical trials indicates that common side effects, such as somnolence (sleepiness) and dizziness, often appear within the first two weeks of use. These adverse reactions are reported to generally decrease in severity with continued use of the medication.

Q: Why do official documents mention the importance of continuous treatment with Addyi?

Official information highlights the need for consistent daily dosing because the drug's efficacy is gradual, rather than immediate. Clinical trials demonstrated results over treatment periods of up to 24 weeks, supporting the importance of continuous use to achieve the observed benefits.

Q: Does using Addyi guarantee improved sexual satisfaction?

No, the use of Addyi does not guarantee a specific outcome. Clinical trials indicate that the average effect size is modest, and the findings reflect general group patterns, not individual patient results. Not all women who use the medication will experience the same level of improvement.

Q: Can Addyi cause changes in mood or thinking?

Since the medication works by affecting brain neurotransmitters, it can impact central nervous system function. Official documents report adverse reactions such as insomnia and general CNS depression (sedation).

Q: Is the research for Addyi based on short-term or long-term studies?

Pivotal clinical trials typically lasted approximately 24 weeks (about six months). Regulatory reviews indicate that while these short-term trials established efficacy and safety at the time, follow-up durations were noted as limited, suggesting a gap in long-term safety data.

Q: Is there a generic version of Addyi available?

According to public regulatory sources in the United States, there is currently no generic version of Addyi (flibanserin) available on the market.

Q: Do I need to inform my doctor about all the supplements I take while on Addyi?

Official guidance states that taking or starting any new prescription medicines, over-the-counter medicines, or herbal supplements requires consultation with the prescribing healthcare professional.

Q: What are the official guidelines regarding stopping Addyi treatment?

Official guidelines state that treatment must be discontinued after 8 weeks if the patient reports no improvement. Additionally, treatment must be stopped immediately if a patient develops liver problems or begins taking a medication classified as a CYP3A4 inhibitor.

Q: Why is Addyi not recommended for women with a history of fainting?

Official warnings highlight the risk of hypotension (low blood pressure) and syncope (fainting) with this medication. While a history of fainting is not a formal contraindication, caution is advised for patients who may be predisposed to low blood pressure.

Q: Does Addyi affect fertility or planning for pregnancy?

Official regulatory documents indicate that there are no adequate studies available in pregnant women to establish a drug-associated risk. Furthermore, the medication is not recommended for use by women who are nursing or breastfeeding.

Q: What is the typical timeframe for a doctor to assess if Addyi is working?

The official guidelines require a doctor to assess the patient after 8 weeks of continuous, daily use. This 8-week period is the specific timeframe set by the administration protocol to determine if the patient has reported any improvement.

Q: Is Addyi known by any other name internationally?

The active ingredient, flibanserin, is marketed under the brand name Addyi in the United States. It is also approved and marketed under the brand name Addyi in some other countries, such as Canada.

Q: What distinguishes Addyi from typical depression treatments?

Although the medication was initially researched for its effects on mood, its unique action leads to a classification as a Multifunctional Serotonin Agonist/Antagonist (MSAA). Its authorized purpose is solely for the treatment of HSDD, and it is not approved for the treatment of mood disorders.

How should Addyi be stored and disposed of?

How to Store and Dispose of Addyi (flibanserin)

Addyi tablets must be stored at Controlled Room Temperature, which is maintained between 68 F and 77 F (20 C and 25 C). The storage conditions are strictly defined to protect the medicine's integrity.

Storage Requirements

Condition Requirement
Temperature 68 F to 77 F (20 C to 25 C)
Protection Keep from freezing, heat, moisture, and direct light.
Container Must be kept in a closed container.
Child Safety Keep the medicine out of the reach of children.

Disposal

Do not keep outdated medicine or medicine no longer needed. Consult a healthcare professional for the appropriate method for disposal of any unused medicine.

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

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