Ospemifene (Osphena) for Vaginal Dryness: How the Pill Works and Who It Suits

Ospemifene, sold under the brand name Osphena, is a once-a-day prescription pill for painful sex and vaginal dryness caused by menopause. It is not an estrogen and is not applied in the vagina. Instead, it belongs to a group of medicines called selective estrogen receptor modulators (SERMs), which act like estrogen on vaginal tissue. Here is how it works, what the research shows, the safety warnings to know about, and the questions to ask your doctor.

What is ospemifene (Osphena)?

Ospemifene is an oral prescription medicine approved by the U.S. Food and Drug Administration in 2013. According to its prescribing information, it is used to treat moderate to severe dyspareunia (pain during sex) and moderate to severe vaginal dryness, both symptoms of vulvar and vaginal atrophy due to menopause [1].

Vulvar and vaginal atrophy is part of what clinicians now call genitourinary syndrome of menopause (GSM): the dryness, irritation, urinary and sexual symptoms that can follow the drop in estrogen after menopause. If you are new to the term, our guide What is vaginal atrophy? explains it in plain language.

How does ospemifene work?

Ospemifene works by acting like estrogen on the tissues of the vagina. It is a selective estrogen receptor modulator, or SERM, which means it binds to estrogen receptors and switches them on in some tissues while acting differently, or even blocking them, in others [1].

In the vagina, that estrogen-like action is the point: in trials it changed the vaginal cell makeup toward a premenopausal pattern and lowered vaginal pH [1]. Because it is a pill, it works through the bloodstream rather than locally. That makes it a different choice from vaginal creams, rings, tablets or inserts, and it is one reason some women who prefer not to use a vaginal product ask about it. It is not a hormone-free option, though: MedlinePlus groups it with hormone medicines [2].

How it is taken

• Dose: one 60 mg tablet by mouth once a day, with food, at about the same time each day [1][2].
• Missed dose: take it when you remember unless it is almost time for the next one. Do not double up [2].
• Duration: the label advises using it for the shortest time that fits your treatment goals and having your clinician reassess it regularly [1].
• Other medicines: tell your clinician about everything you take, including estrogens, other SERMs, certain antifungal medicines and herbal products such as St. John’s wort, because some can interact [1][2].

What the research shows

Approval was based on three 12-week randomized, placebo-controlled trials in postmenopausal women, plus a 52-week safety study in women with a uterus [1]. Women taking ospemifene had greater improvement in their most bothersome symptom (pain during sex or vaginal dryness) than those taking placebo, along with improvements in vaginal cells and pH.

According to The Menopause Society’s 2020 position statement on GSM, ospemifene is one of the effective prescription options for moderate to severe symptoms, alongside low-dose vaginal estrogen and vaginal DHEA (prasterone) [3]. Head-to-head trials between these options are limited, so no one choice is clearly best for every woman.

Side effects and safety

Most side effects in trials were mild, but ospemifene carries important warnings because it acts like estrogen in some tissues. Common side effects listed in the prescribing information include [1]:

• Hot flashes: about 6.5% vs. 2.6% with placebo in the 12-week trials, and about 12% in studies lasting up to a year.
• Vaginal discharge: about 3.8% vs. 0.4% with placebo.
• Muscle spasms and increased sweating, each in a small percentage of women.

The boxed warning

Like estrogen-only products, ospemifene’s label has a boxed warning [1]. It notes that ospemifene acts like estrogen on the lining of the uterus (endometrium), so any unexpected vaginal bleeding should be checked promptly. It also notes the increased risk of stroke and deep vein thrombosis (blood clots) seen with estrogen-alone therapy in the Women’s Health Initiative. People with active or past blood clots, stroke or heart attack, undiagnosed genital bleeding, or estrogen-dependent cancers should not take it [1].

Ospemifene and breast cancer

Ospemifene has not been adequately studied in women with breast cancer, and the prescribing information says it should not be used by women with known or suspected breast cancer or a history of breast cancer [1]. If this applies to you, our guide to vaginal dryness after breast cancer covers the options oncology and gynecology guidelines usually start with.

How ospemifene compares with other options

Ospemifene is one of several prescription options, and most women start with simpler steps first. Here is how it fits in:

• Vaginal moisturizers and lubricants: the usual first step for mild symptoms. Moisturizers are used on a schedule for everyday comfort, and lubricants reduce friction during sex. See how to choose a vaginal moisturizer.
• Low-dose vaginal estrogen: the most studied prescription option, used as a cream, tablet, insert or ring. Compare it in vaginal estrogen vs. hormone-free options.
• Vaginal DHEA (prasterone): a nightly vaginal insert that cells convert into small amounts of estrogens and androgens. Read our guide to DHEA for vaginal dryness.
• Ospemifene: the only option on this list taken as a daily pill, which some women find easier than a vaginal product.
• Pelvic floor physical therapy: helpful when pain has led to muscle tension or guarding.

For the full picture of hormone-free and prescription choices, see how to treat vaginal dryness and our roundup of non-hormonal alternatives to estrogen.

Who might consider ospemifene?

Ospemifene may be worth asking about if you are postmenopausal, sex has become painful or dryness is bothering you, and moisturizers and lubricants alone are not giving you enough comfort. Some women choose it because they prefer a pill to applying something in the vagina, or because vaginal products are hard to use. It is not intended for women who could be pregnant, and it is not a fit for women with a history of blood clots, stroke or breast cancer [1].

Questions to bring to your appointment:

• Are my symptoms caused by menopause-related dryness and thinning, or could something else be involved?
• How does ospemifene compare with vaginal estrogen or vaginal DHEA for my health history?
• Do I have any risk factors for blood clots or stroke that would rule it out?
• Is it covered by my insurance, and is there a lower-cost option?
• How long should I try it before we reassess, and how often should we review it?

Our guide on how to talk to your doctor about vaginal dryness has more tips, and our resources page lists directories for finding a menopause specialist.

When to see a doctor

Ospemifene is prescription-only, so a clinician visit is the first step. Make an appointment sooner, or seek care promptly, if you notice:

• Any vaginal bleeding after menopause, or bleeding after sex
• Pain during sex that is getting worse or keeps you from intimacy
• Burning, itching or unusual discharge with an odor, which can signal an infection
• Burning with urination, frequent urges or repeated urinary tract infections
• Dryness that does not improve after several weeks of using a moisturizer or lubricant

If you are already taking ospemifene, get emergency care right away for signs of a stroke or blood clot, such as sudden severe headache, vision changes, chest pain, shortness of breath, or pain or swelling in one leg [2].

FAQ

Is ospemifene a hormone?

Ospemifene is not an estrogen and contains no hormones, but it is a hormone-acting medicine. It belongs to a class called selective estrogen receptor modulators (SERMs), which act like estrogen in some tissues, including the vagina, and differently in others. That is why its label carries some of the same warnings as estrogen products.

How long does ospemifene take to work?

In the clinical trials, results were measured after 12 weeks of daily use. Some women notice changes sooner, but clinicians usually suggest giving it about three months before deciding whether it is helping, then reviewing whether to continue.

Can I take ospemifene if I had breast cancer?

The prescribing information says ospemifene should not be used by women with known or suspected breast cancer or a history of breast cancer, because it has not been adequately studied in that group. If you have had breast cancer, talk with your oncologist about which options are appropriate for you.

Is ospemifene better than vaginal estrogen?

There is no clear winner for everyone. Low-dose vaginal estrogen is the most studied prescription option, while ospemifene is a once-daily pill that some women prefer to vaginal products. The right choice depends on your symptoms, health history and preferences, so it is a decision to make with your clinician.

Can I use a lubricant or moisturizer while taking ospemifene?

Many women keep using a lubricant for intimacy and a vaginal moisturizer for everyday comfort while on a prescription treatment. Ask your clinician or pharmacist if you are unsure what to combine.

Related reading

• How to treat vaginal dryness: options compared
• DHEA (prasterone) for vaginal dryness
• Genitourinary syndrome of menopause (GSM) explained
• Vaginal estrogen vs. hormone-free options
• Painful sex after menopause
• Non-hormonal treatment for vaginal dryness

Sources

1. U.S. National Library of Medicine, DailyMed. OSPHENA (ospemifene) tablets: prescribing information.
2. MedlinePlus (NIH). Ospemifene. Drug information.
3. The North American Menopause Society. The 2020 genitourinary syndrome of menopause position statement. Menopause. 2020;27(9):976–992.
4. Kingsberg SA, et al. Vulvar and vaginal atrophy in postmenopausal women: findings from the REVIVE survey. J Sex Med. 2013;10(7):1790–1799.

Educational content, not medical advice · Reviewed and updated October 13, 2026 by the Vaginal Dryness Relief Editorial Team · Medical disclaimer