Why progesterone is used in menopause
Progesterone's main job in menopause treatment is protective. Estrogen is the hormone that relieves hot flashes and night sweats — but estrogen on its own makes the lining of the uterus (the endometrium) thicken, which over time raises the risk of endometrial (uterine) cancer. Adding progesterone, or a synthetic progestogen, keeps that lining in check. So the rule of thumb is simple: if you have a uterus and take estrogen, you also take progesterone; if you've had a hysterectomy, you usually take estrogen alone.
Types and forms of progesterone
| Form | What it is |
|---|---|
| Micronized ("body-identical") progesterone | Molecularly identical to your own progesterone; often taken as a nightly capsule, generally well tolerated, and may aid sleep |
| Synthetic progestogens (progestins) | Lab-made versions used in many combined HRT pills and patches |
| Hormonal IUD (levonorgestrel) | Delivers a progestogen directly to the uterus to protect the lining — and doubles as contraception |
Can progesterone help symptoms on its own?
Beyond protecting the uterus, micronized progesterone is sometimes used to help with sleep: it has a mild calming effect and is usually taken at bedtime, and some women find it eases perimenopausal sleep disruption. It is not, however, a substitute for estrogen when it comes to hot flashes — estrogen is far more effective for those vasomotor symptoms.
Side effects and what to expect
Common and usually mild effects include drowsiness (which is why it's taken at night), bloating, breast tenderness, and mood changes. Body-identical micronized progesterone is often better tolerated than older synthetic progestins. As with all hormone therapy, the benefits and risks depend on your age, health history, and how soon after menopause you start — so the type, dose, and route should be chosen with a clinician.
Do you need progesterone?
You generally need it only if you have a uterus and are taking estrogen. After a hysterectomy, progesterone usually isn't required. Whether hormone therapy is right for you — and which form of progesterone — is a personalized decision; see how to get menopause care to discuss it with a clinician, and perimenopause vs. menopause for where you are in the transition.
