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Addyi Explained: It's Use in Hypoactive Sexual Desire Disorder

Medically reviewed by Leigh Ann Anderson, PharmD. Last updated on Aug 18, 2021.

Is Addyi Just a Pink Viagra?

Some drugs always make the top headlines, so you've probably heard about Addyi by now.

It's also known generically as flibanserin and was approved by the FDA in August 2015 to treat hypoactive sexual desire disorder (HSDD) in premenopausal women. That's just another of way saying it boosts sex drive (also called libido) in women who have not reached menopause. It was the first such drug approved for this use. HSDD is the most common type of female sexual dysfunction, affecting roughly 6 million premenopausal women in the U.S.

But here's a mythbuster: it is not a "female Viagra" or a "pink Viagra", as you may have heard.

  • In fact, it works very differently from the erectile dysfunction (ED) class of drugs used in men like Viagra (sildenafil) or Cialis (tadalafil).
  • Addyi works to balance brain chemicals (neurotransmitters) that may be responsible for the lowered sex drive in some women.
  • ED drugs like Viagra increase smooth muscle relaxation and the inflow of blood to the corpus cavernosa in the penis.

More About How Addyi Works

Drugs always seem to be in complicated drug classes, and Addyi is, too.

  • Addyi is a non-hormonal, multifunctional serotonin agonist antagonist (MSAA).
  • Addyi appears to corrects an imbalance of the neurotransmitters (brain chemicals) dopamine and norepinephrine (both responsible for sexual excitement), while decreasing levels of serotonin (which can lower sex drive).
  • As with many drugs, the exact mechanism is not known, according to FDA.

Don't get caught up in all the specifics, however. The takeaway from all of this? Addyi works in the brain and many of its side effects, like dizziness and drowsiness, are due to its central nervous system action there, too.

Is Addyi Effective?

The answer to this question may depend upon who you ask.

The effectiveness of Addyi was evaluated in three 24-week clinical trials in 2,400 premenopausal women with HSDD. On average, taking Addyi increased the number of satisfying sexual events by 0.5 to 1 additional event per month over placebo. Roughly 10% more (10 out of every 100) Addyi-treated patients than placebo-treated patients reported meaningful improvements in satisfying sexual events, sexual desire or distress.

But a study in JAMA Internal Medicine found that effectiveness was even lower: treatment with Addyi, on average, resulted in only one-half additional satisfying sexual event per month while significantly increasing the risk of some troublesome side effects, like:

  • dizziness
  • somnolence (drowsiness)
  • nausea
  • fatigue.

However, there may be a certain subset of women who have success with Addyi to boost their libido. Discuss with your doctor if a trial of Addyi is a wise option for you.

Am I a Candidate for Addyi?

Addyi is approved by the FDA (with limitations) to treat acquired, generalized hypoactive sexual desire disorder (HSDD) in premenopausal women. It's not used to boost sex drive in postmenopausal women or in men.

HSDD is acquired if you previously had normal sexual desires, and it's generalized when your low libido occurs no matter the sexual activity or partner. There are other prerequisites to be a candidate for Addyi, too: your low libido must also cause marked distress or an interpersonal difficulty.

If your low sex drive is due to:

  • a co-existing medical or psychiatric condition (for example, depression)
  • problems with a significant other (husband, partner)
  • due to side effects of a drug

then Addyi is not for you.

What's the History Behind Addyi?

Originally, flibanserin was under research as a depression treatment. When FDA rejected approval of the drug for libido in 2010, Boehringer Ingelheim sold the drug to Sprout Pharmaceuticals.

  • Under Sprout's development, flibanserin as a treatment for low libido in women was rejected two more times by the FDA. Advisory members stated lack of effectiveness and risky side effects.
  • However, Sprout forged ahead, rounding out studies, creating "disease awareness" in the general public and with healthcare providers, and continuing to work with FDA to gain Addyi approval.
  • On August 20, 2015 Valeant Pharmaceuticals acquired Sprout Pharmaceuticals and Addyi for a massive $1 billion in cash, two days after Addyi approval.

Why Was There So Much Buzz With Addyi?

Women's groups heralded the approval of Addyi as finally meeting a significant unmet need.

Based on studies, there may be a small group of women for which this drug is effective. However, if no results are seen after 8 weeks, the drug should be stopped, according to product directions.

Common side effects include dizziness, nausea and sleepiness. The risk of fainting, particularly when combined with alcohol, is also a major concern. Do not drink alcohol close to the time you take your Addyi dose because this increases your risk of severe low blood pressure and fainting (loss of consciousness).

New recommendations for labeling from the FDA regarding alcohol use were reported in April 2019.

  • The Addyi package insert section is now updated to note that women should discontinue drinking alcohol at least two hours before taking Addyi at bedtime (if they've had 1 or 2 standard drinks that night) - OR skip the Addyi dose that evening if they have had 3 or more alcoholic drinks that night. One standard alcoholic drink is equivalent to one 12-ounce regular beer (5% alcohol), 5-ounces wine (12% alcohol), or 1.5 ounces of distilled spirits/shot (40% alcohol).
  • After taking addyi at bedtime, do not use alcohol until the following day.
  • Women should not consume alcohol at least until the morning after taking Addyi at bedtime.
  • Combining Addyi with alcohol may increase the risk of low blood pressure and fainting, which is problematic especially if you are driving, doing hazardous activities, or need clear thinking.

How Do Women Take Addyi?

Addyi is taken as an oral 100 mg dose at bedtime, each night; and yes, it's pink.

  • It's important to follow directions and take the dose just before bed to decrease the risk of injury due to low blood pressure, fainting, and sleepiness.
  • These effects can occur even if Addyi is NOT combined with alcohol. Taken by itself, Addyi can cause drowsiness.

However, be aware that when it's combined with other drugs that also cause drowsiness -- like some antihistamines, pain pills, anxiety drugs or sedatives -- your sleepiness will be enhanced.

Don't take Addyi during waking hours, as your risk for fainting, injury, and drowsiness is increased. Driving or other hazardous activities should be avoided for at least 6 hours after an Addyi dose.

There are certain medications called CYP3A4 inhibitors you should not take with Addyi. Combining these drugs can lead to severe low blood pressure and fainting. Be sure to discuss your medications with your doctor and pharmacist, and have a drug interaction screen completed each time you start or stop a medication. Do not take Addyi if you have any degree of liver problem, either due to fainting risk.

Nausea, insomnia, and dry mouth are other possible side effects with Addyi.

How Do I Get Addyi?

The cost of Addyi is very expensive - close to $550 per month if you're paying cash. Most people can't afford that. But there may be ways to save.

  • Check with your insurance to see if it's covered; and what your copay is. Many health plans will not pay for this drug.
  • The manufacturer is offering a special program to women who would like to explore the option of using Addyi. You may be able to get Addyi for a $20 copay per month if you have insurance that covers the cost of Addyi.
  • You can fill out the copay card application at the website or call 844-PINK-PILL (844-746-5745).

Vyleesi (bremelanotide) Approved

Addyi has to be taken daily, with the significant possibility of side effects like fainting, which can be worsened with alcohol consumption. Some women may not like this risk.

A new agent, Vyleesi (bremelanotide) from AMAG Pharmaceuticals, was approved in June 2019 for hypoactive sexual desire disorder (HSDD) in premenopausal women. Vyleesi injection is now the second treatment approved to boost libido in women.

  • Vyleesi is a melanocortin receptor agonist. It is a first-in-class agent thought to activate endogenous melanocortin pathways involved in sexual desire and response.
  • Unlike Addyi, which is a pill, Vyleesi is an injection. Women give themselves a subcutaneous shot (under the skin) 45 minutes prior to sexual activity, on an as-needed basis, as opposed to taking a daily pill like Addyi.

In two clinical trials of close to 1,200 women, roughly 25% of patients treated with Vyleesi had an increase of 1.2 or more in their sexual desire score (range of 1.2 to 6.0, higher scores equal greater sexual desire) compared to 17% of those who took placebo.

Common side effects in studies included nausea (40%), flushing (20%), injection site reactions (3%), and headache (11%). Vyleesi should not be used in women with uncontrolled high blood pressure or other known heart risks.

Addyi: The Bottom Line

Still thinking about trying Addyi? It's important to understand this drug before you start taking it.

  • Fully read the FDA-approved Medication Guide and ask your doctor or pharmacist any questions you have. There are many restrictions with this drug, so be sure you follow them.
  • Also, be sure you are an appropriate candidate for Addyi, and understand that it's not effective in all women.
  • If you have marital or relationship problems, mental health issues, or lack of sex drive due to a medication, Addyi is not for you. Other medical options or counseling may be the better answer.
  • If you take certain medications (some CYP3A4 inhibitors) or have any level of liver impairment, your risk for low blood pressure and fainting is increased. You should not use Addyi.
  • Be sure your pharmacist or doctor checks for drug interaction each time you have a new prescription filled or start (or even stop) a medication

Finished: Addyi Explained: It's Use in Hypoactive Sexual Desire Disorder

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  • Bremelanotide Approval Status. Accessed August 18, 2021 at
  • Cohen J. Female Sex Drive Booster Addyi Is Back, But Will Second Time Around Be Different? Forbes. June 18, 2018. Accessed August 18, 2021 at
  • Jaspers L, Feys F, Bramer WM, et al. Efficacy and Safety of Flibanserin for the Treatment of Hypoactive Sexual Desire Disorder in Women: A Systematic Review and Meta-analysis. JAMA Intern Med. 2016;176(4):453–462. Accessed August 18, 2021 at DOI: 10.1001/jamainternmed.2015.8565
  • U.S. Food and Drug Administration (FDA). Drugs@FDA. Addyi. 10/2019. Accessed August 18, 2021 at
  • Addyi Prescribing Information. Sprout Pharmaceuticals. Accessed August 18, 2021 at
  • FDA Briefing Documents. Joint Meeting of the Bone, Reproductive and Urologic Drugs Advisory Committee (BRUDAC) and the Drug Safety and Risk Management (DSaRM) Advisory Committee. Flibanserin. June 4, 2015.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.