Short answer: In menopause, progesterone’s main job is protecting the lining of the uterus when you take estrogen. Women who still have a uterus and use systemic estrogen need a progestogen, and oral micronized progesterone (Prometrium) is FDA-approved for exactly that. Taken at bedtime, it may also help some women fall asleep. In a large randomized trial, hormone therapy that included micronized progesterone did not cause extra weight gain compared with placebo.
What Progesterone Does in Menopause
Prometrium contains micronized progesterone, which its label describes as chemically identical to the progesterone made by the ovaries. Its FDA-approved uses are preventing endometrial hyperplasia (overgrowth of the uterine lining) in postmenopausal women with a uterus who are taking estrogen, and treating secondary amenorrhea (missed periods) before menopause. It is not FDA-approved on its own for hot flashes.
Do You Need Progesterone for Menopause?
If you have a uterus
Yes, if you take systemic estrogen. Estrogen alone raises the chance of endometrial hyperplasia, which may lead to cancer of the uterine lining. In the trial on the Prometrium label, 358 postmenopausal women were followed for up to 36 months. Hyperplasia occurred in 64% of women on estrogen alone, compared with 6% of those who also took Prometrium, close to the 3% seen on placebo.
If you’ve had a hysterectomy
Prometrium’s menopause indication is specifically for women who still have a uterus, so women without one who take estrogen alone generally don’t need it for uterine protection. We answer this in more detail in do I still need progesterone if I have no uterus?
Progesterone and Sleep
Preclinical research shows progesterone’s breakdown products act on GABA-A receptors in the brain, which is one reason it is studied for sleep. A 2021 meta-analysis of 9 randomized trials (388 participants, mostly postmenopausal women) found:
- Micronized progesterone shortened the time it took to fall asleep in pooled data
- It did not significantly improve total sleep time or sleep efficiency in pooled data
- Self-reported sleep improved in most trials
- Many trials also gave estradiol and improved hot flashes, which makes it hard to credit progesterone alone
In a small 2011 placebo-controlled study of 8 postmenopausal women, 300 mg at bedtime did not change normal sleep, but when sleep was disrupted it cut time awake after falling asleep by about half. See does oral progesterone help you sleep, or not? and why do I still wake up at 3am on HRT?
Does Progesterone Cause Weight Gain?
The randomized PEPI trial followed 875 postmenopausal women for 3 years. Women assigned to estrogen, with or without a progestogen (one arm used micronized progesterone 200 mg on days 1 to 12), gained on average 1.0 kg less than women on placebo, and weight change did not differ between the hormone regimens. That said, the Prometrium label notes that progesterone may cause some fluid retention, and bloating was more common than on placebo (12% vs 5%), which can feel like weight gain. More in does oral progesterone cause weight gain?
Progesterone Side Effects
In the Prometrium label’s 3-year trial (200 mg with estrogen vs placebo), side effects that were more common on treatment included breast tenderness (27% vs 6%), dizziness (15% vs 9%), abdominal bloating (12% vs 5%), depression (19% vs 12%) and headache (31% vs 27%). Other things to know:
- Take it at bedtime. The label warns it can cause dizziness and drowsiness, and a few women have had extreme dizziness, blurred vision or trouble walking early in treatment. Use caution driving.
- Peanut allergy. Prometrium capsules contain peanut oil and should not be used by people allergic to peanuts.
- Who should not take it: the label lists unexplained vaginal bleeding, current or past breast cancer, blood clots, stroke or heart attack, and liver disease.
- Mood. If you feel low on progesterone, tell your provider; see oral progesterone is making me depressed. Is that a thing?
For what to expect when starting both hormones, see if I start estradiol plus progesterone, what side effects should I expect?
How Progesterone Is Taken
The labeled regimen for uterine protection is 200 mg by mouth at bedtime for 12 days in a row per 28-day cycle, alongside daily estrogen. Your provider sets your actual schedule and dose. Progesterone troches (dissolving lozenges) are compounded rather than FDA-approved, and the FDA notes it does not verify the safety, effectiveness or quality of compounded drugs before they are marketed. Any new, heavy or recurring bleeding on hormone therapy should be checked.
What About the Boxed Warning?
In February 2026 the FDA approved labeling changes that removed cardiovascular disease, breast cancer and probable dementia risk statements from the boxed warning on the first six menopausal hormone therapy products, including progestogen-alone therapy for women with a uterus using systemic estrogen. Labels are being updated product by product. The Menopause Society’s 2022 position statement says that for women younger than 60, or within 10 years of menopause, without contraindications, the benefit-risk ratio of hormone therapy is favorable for bothersome hot flashes and preventing bone loss.
Getting Progesterone Through Viking
Viking Alternative Medicine is a national telehealth clinic: visits happen by video or phone, labs are drawn at a local lab near you, and a licensed provider reviews your results before recommending any treatment. Progesterone is usually prescribed alongside estrogen, such as an estradiol patch. Learn more on our progesterone page or browse women’s health and menopause care. Start your online visit.
Frequently Asked Questions
Do I need progesterone if I’m taking estrogen for menopause?
If you have a uterus, yes. Estrogen alone raises the risk of endometrial hyperplasia. In the Prometrium label trial, hyperplasia occurred in 64% of women on estrogen alone versus 6% of women who also took Prometrium.
Do I need progesterone after a hysterectomy?
Generally not for uterine protection. Prometrium’s menopause indication is for women who still have a uterus. Your provider will confirm based on your history.
Does progesterone help you sleep during menopause?
It may. A 2021 meta-analysis of randomized trials found micronized progesterone shortened the time to fall asleep, but pooled data did not show significant gains in total sleep time. Many women take it at bedtime because it can cause drowsiness.
Does progesterone cause weight gain in menopause?
Randomized data don’t show that. In the 3-year PEPI trial, women on hormone therapy, including a micronized progesterone regimen, gained about 1 kg less than women on placebo. Progesterone can cause some fluid retention and bloating.
What are the side effects of progesterone for menopause?
In the Prometrium label trial, breast tenderness, dizziness, bloating, depression and headache were more common than on placebo. It can cause drowsiness, so it’s taken at bedtime, and the capsules contain peanut oil.
Why is progesterone taken at night?
The label says it can cause dizziness and drowsiness and should be taken as a single dose at bedtime.
Sources
- Prometrium (progesterone) capsules prescribing information, DailyMed
- Nolan BJ et al. Efficacy of Micronized Progesterone for Sleep: A Systematic Review and Meta-analysis of Randomized Controlled Trial Data. J Clin Endocrinol Metab. 2021 (PubMed)
- Caufriez A et al. Progesterone prevents sleep disturbances and modulates GH, TSH, and melatonin secretion in postmenopausal women. J Clin Endocrinol Metab. 2011 (PubMed)
- Espeland MA et al. Effect of postmenopausal hormone therapy on body weight and waist and hip girths (PEPI). J Clin Endocrinol Metab. 1997 (PubMed)
- FDA: FDA Approves Labeling Changes to Menopausal Hormone Therapy Products (Feb 12, 2026)
- The 2022 hormone therapy position statement of The North American Menopause Society (PubMed)
- FDA: Compounding and the FDA: Questions and Answers
Medical disclaimer: This article is general education, not medical advice, and it does not create a patient relationship. Prescription medicines are only appropriate after evaluation by a licensed clinician who knows your history and lab results. If you have chest pain, trouble breathing, signs of a blood clot or stroke, or another emergency, call 911.