Progesterone for Menopause: Benefits, Side Effects and What to Expect

Estrogen is the part of HRT that relieves hot flashes and night sweats. But in a woman who still has a uterus, systemic estrogen taken on its own stimulates the uterine lining (endometrium) to grow, which raises the risk of endometrial hyperplasia and endometrial cancer. Adding a progestogen - the umbrella term for progesterone and synthetic progestins - counteracts that effect.

That is why women with a uterus are generally prescribed combined HRT, while women who have had a hysterectomy usually take estrogen alone. Progesterone's main job in menopausal HRT is endometrial protection, not symptom relief.

Micronized progesterone is chemically identical to the progesterone the ovaries make; "micronized" refers to the fine particle size that helps it be absorbed when swallowed. The best-known FDA-approved product is Prometrium, and generic versions are widely available. Synthetic progestins - such as medroxyprogesterone acetate or norethindrone - are related molecules with somewhat different effects, and they're used in some combined pills and patches and in the levonorgestrel IUD.

Many menopause clinicians favor micronized progesterone for its side-effect profile, but progestins remain valid options, and some women tolerate one better than the other. As with estrogen, "bioidentical" doesn't mean risk-free - see bioidentical hormones explained.

Oral micronized progesterone is the standard, FDA-approved form for protecting the uterine lining in menopausal HRT. Some clinicians prescribe vaginal progesterone for women who get side effects from the oral form; in the US this is generally an off-label use for endometrial protection, and the evidence is more limited than for oral progesterone, so it's worth asking your clinician why it's being recommended.

Progesterone can be taken on two main schedules:

• Cyclical (sequential) - taken for part of each month. The Prometrium label, for example, describes 200 mg at bedtime for 12 days of each 28-day cycle alongside daily estrogen. This usually brings a monthly withdrawal bleed and is common in perimenopause.
• Continuous - a lower dose every day, usually aiming for no bleeding once things settle. It is more often used after menopause.

Your clinician will choose the product, dose and schedule based on your bleeding pattern and history - don't change them on your own. If you're still having periods, see HRT for perimenopause.

Many women take progesterone without much trouble, but side effects are common, especially in the first few months. The ones most often reported include:

• Drowsiness or dizziness - which is why oral progesterone is usually taken at bedtime. Be cautious driving or operating machinery until you know how it affects you.
• Breast tenderness.
• Bloating and other stomach upset.
• Mood changes - some women notice low mood, irritability or PMS-like symptoms, particularly on the progestogen days of a cyclical regimen.
• Headache.
• Spotting or bleeding - irregular bleeding is common early on, and cyclical regimens usually produce a regular monthly bleed.

If side effects are bothering you, tell your clinician. Options can include changing the timing, dose, schedule or type of progestogen - but those are decisions to make together.

A few important points from the prescribing information:

• Peanut allergy - Prometrium capsules contain peanut oil and should not be used by anyone allergic to peanuts. Tell your clinician about any food allergies, and ask whether a generic you're given has the same ingredients.
• Severe dizziness or drowsiness - during early treatment some women have had extreme dizziness or drowsiness, along with symptoms like blurred vision, slurred speech or difficulty walking. These need medical attention.
• Contraindications - progesterone is generally not used in women with unexplained vaginal bleeding, known or suspected breast cancer, active or past blood clots or stroke, or significant liver disease, among others.

On February 12, 2026, the FDA approved updated labeling for Prometrium as one of the first six menopausal hormone therapy products to drop the boxed warning about cardiovascular disease, breast cancer and probable dementia. That reflects newer evidence about timing and age - it does not mean those risks disappeared. They remain in the prescribing information, and combined estrogen-plus-progestogen therapy is still associated with a small increase in breast-cancer risk with longer use. Read more in is HRT safe?

Seek emergency care for possible signs of a blood clot, stroke or heart attack: chest pain, sudden shortness of breath, pain or swelling in one leg, a sudden severe headache, sudden vision changes, or weakness, numbness or trouble speaking. Also get urgent help for signs of a serious allergic reaction.

Contact your clinician soon if you notice a new breast lump, yellowing of your skin or eyes, heavy or persistent bleeding (or any bleeding after you had stopped bleeding for 12 months), significant mood changes or depression, or side effects that don't settle after the first few months.

If you take estrogen and have a uterus, any legitimate HRT provider should include a progestogen in your plan. Winona prescribes progesterone alongside its estradiol options, Gala offers oral or vaginal progesterone with FDA-approved estradiol, and Midi Health sends prescriptions to your own pharmacy. See how they compare in Winona vs Gala, Gala vs Midi Health, or our guide to what HRT is.

This article is general information, not medical advice. A licensed clinician should decide which progestogen, dose and schedule, if any, is right for you.