Progesterone During Menopause

With a uterus, systemic estrogen usually needs a progestogen to reduce the risk of endometrial overgrowth and cancer. Micronized progesterone is one option. Its protective effect depends on an adequate dose and schedule.

The US Prometrium label describes a cyclic protective regimen in postmenopausal women taking conjugated estrogen tablets. Clinicians can use other regimens with different estrogen products, but the prescription must state the intended schedule and protection.

After hysterectomy, routine estrogen HRT often does not need progesterone. Residual endometriosis or another circumstance may change that advice. An additional symptom goal, such as sleep, needs a separate discussion of benefit and risk.

As one UK example, NHS Utrogestan guidance describes 200 mg on days 15 to 26 of a 28-day HRT cycle and other schedules after periods have stopped. These instructions illustrate why a calendar matters; they are not a schedule to choose without a prescriber.

During perimenopause, ovarian cycles can continue and pregnancy can remain possible. HRT progesterone does not provide reliable contraception. The clinician should review bleeding and contraceptive needs alongside symptom treatment.

A 2021 systematic review identified nine randomized trials totaling 388 participants, predominantly postmenopausal women. Some sleep outcomes improved with micronized progesterone. Pooled results favored faster sleep onset, while total sleep time and sleep efficiency did not show clear pooled improvement.

Some trials also used estradiol or improved night sweats, making progesterone's independent contribution harder to establish. The evidence supports a discussion of possible benefit, but it cannot predict whether one person's insomnia will improve.

A 2023 trial in 189 perimenopausal women tested progesterone against placebo. Its main hot-flash and night-sweat score did not show statistically clear superiority. Participants reported improvements in night sweats and sleep, but the trial was underpowered and the findings were not uniform across outcomes.

Using progesterone specifically for sleep or hot flashes alone is outside the cited US Prometrium indication. A clinician should explain that use, assess other sleep causes, and agree how benefit and adverse effects will be reviewed.

Oral progesterone can cause dizziness and drowsiness. Bedtime use is advised for Prometrium, but next-day impairment still needs attention. Avoid driving while affected and tell the prescriber about pronounced sedation, mood changes, or headaches.

Food instructions vary between products. Check the actual leaflet, and check allergies: Prometrium contains peanut oil. A different formulation or protective regimen may be discussed when tolerance is poor.

• Keep estrogen and progesterone instructions together.
• Record symptom relief, side effects, and bleeding.
• Report missed doses that leave the regimen difficult to follow.
• Agree a protective alternative before removing progesterone during systemic estrogen use.

NICE recommends prompt assessment of unscheduled bleeding beyond six months after starting systemic HRT or three months after changing it. Heavy or concerning bleeding warrants earlier advice.