Progesterone for Perimenopause (2026)
Quick answer: Oral micronized progesterone taken at bedtime is widely used in perimenopause for night sweats, sleep, and — when estrogen is also prescribed — endometrial protection. A randomized trial found it reduced perimenopausal night sweats and hot flushes versus placebo.
Progesterone in Perimenopause care
Perimenopause is characterized by erratic, often high estrogen against declining progesterone, which is one reason cycle changes, heavy flow, and disrupted sleep cluster in this stage. Oral micronized progesterone — body-identical, unlike synthetic progestins — is used to address that imbalance. Taken at bedtime, its mild sedative effect is often leveraged deliberately for sleep.
The evidence base includes a Canadian phase III randomized trial in perimenopausal women, which found oral micronized progesterone (300 mg at bedtime) decreased night sweats and hot flushes compared with placebo. In HRT regimens, adequate progesterone dosing also protects the uterine lining from estrogen-driven overgrowth — the doses used for endometrial protection (commonly 100 mg continuous or 200 mg cyclic) differ from trial dosing for vasomotor symptoms, so the target dose depends on the indication.
Practical notes: it is taken at night because drowsiness is common; it is not a contraceptive, and pregnancy is still possible in perimenopause; and any unscheduled or heavy bleeding on a progesterone-containing regimen warrants clinical assessment rather than a dose change on your own.