Cyclical vs Continuous Progesterone in Perimenopause

Cyclical progesterone means taking progesterone for 10 to 14 days each month while you take estrogen every day, which brings a predictable monthly bleed. Continuous progesterone means taking it every day alongside your estrogen, a schedule designed to give no bleeding at all. In perimenopause, when your own periods are still showing up irregularly, cyclical is usually the schedule to start with, because starting continuous too close to the transition can cause unpredictable spotting.

What do cyclical and continuous progesterone schedules look like?

The Australasian Menopause Society describes the two this way: cyclical therapy gives the progestogen (the umbrella term for progesterone and similar hormones) for 10 to 14 days a month and brings withdrawal bleeds. Continuous therapy gives both hormones daily and should not bring a bleed.

The FDA-approved capsule, Prometrium, lists one cyclical schedule on its label. A postmenopausal woman with a uterus who takes estrogen should take 200 mg at bedtime for 12 continuous days per 28-day cycle.

Micronized progesterone has been used in Europe since 1980. Women who wanted a regular monthly bleed took 300 mg at bedtime for 10 days a month. Women who would rather not bleed took 200 mg for 14 days a month or 100 mg for 25 days a month.

Both schedules do the main job. Taking estrogen without progesterone raises your risk of uterine lining (endometrial) cancer. The Menopause Society's 2022 hormone therapy statement says a progestogen taken continuously, or cyclically for 10 to 14 days a month, significantly reduces that risk.

Which progesterone schedule is better if I'm still in perimenopause?

Cyclical is the usual starting point while you still get some periods on your own or have only recently stopped. The Australasian Menopause Society says cyclical therapy is generally used for women in the transition with irregular periods and for women very recently past menopause. If you like having a monthly bleed, you can stay on it longer.

Continuous progesterone can backfire if you start it too early. Your ovaries are still making their own hormones on an unpredictable schedule, so a plan designed to stop bleeding may not stop it yet. The Society says starting continuous therapy close to the transition may lead to irregular, unscheduled bleeding. Later on, continuous is the routine many older women prefer because it is more convenient.

Expect some irregular bleeding in the first three to six months on any schedule. It is common. Bleeding you did not expect after about six months needs checking, so tell your clinical team.

Your preference counts too. The Menopause Society notes that many women choose a schedule that avoids a monthly bleed. There is also a reason to revisit your schedule later. With long-term use, observational studies suggest a possibly higher uterine cancer risk on cyclical schedules than on continuous ones. Once you are past menopause, ask your clinical team whether it is time to switch.

Can progesterone help with perimenopause night sweats and sleep?

It may help your nights, though the trial results are mixed. In a four-month trial of 189 perimenopausal women aged 35 to 58, 300 mg of oral micronized progesterone every night did not beat placebo on the main hot flash and night sweat score. Women taking it did report fewer night sweats, better sleep quality and less interference with their daily lives than women on placebo.

The Menopause Society says 300 mg of micronized progesterone nightly decreases hot flashes and night sweats compared with placebo and improves sleep. It also says there are no long-term results yet. Taking progesterone without estrogen for these symptoms is off-label, meaning it is not an approved use.

One woman took 100 mg with a fatty dinner alongside estradiol and described an "absolutely hammered feeling that I loooooove." Her result: "Then blissful 9 hours of sleep." She had gone years without good sleep through perimenopause. That is her experience, and yours may differ.

What side effects should I expect from progesterone?

Take progesterone capsules at bedtime. The Prometrium label says some women get very drowsy or dizzy after a dose. In a few cases women had blurred vision or trouble speaking or walking, and the label says to contact your healthcare provider right away if that happens.

In the label's trial, women took 200 mg of progesterone cyclically with estrogen. Compared with placebo, they reported:

• More breast tenderness (27% vs 6%)
• More bloating (12% vs 5%)
• More depression (19% vs 12%)
• Fewer hot flashes (11% vs 35%)

The capsules contain peanut oil, so skip them if you are allergic to peanuts.

When hormone therapy makes you feel bad, the progestogen is usually the cause. The Australasian Menopause Society lists mood changes, bloating, headache and breast pain as the common problems, and says a different form or a different way of taking it may help. Progesterone creams are not one of those fixes. They are not reliably absorbed and do not protect the lining well enough.

Mood changes are worth raising early. One woman said she was "crying the next and anxious about EVERYTHING," and wrote, "I started low and now I'm on .05 Estrodial (patch) and 100 progesterone daily." If you feel like this, tell your clinical team. Your schedule or form can change.

How does progesterone fit with estrogen, and what does it cost?

If you take estrogen and still have a uterus, you need a progestogen with it to protect the lining. If you have had a hysterectomy, you do not need one. The Australasian Menopause Society says only women with an intact uterus need it.

Our clinical team can prescribe bioidentical estrogen if it fits your goal. If you have a uterus, ask your clinical team which progesterone schedule, cyclical or continuous, fits where you are in perimenopause.

For a price reference, The HRT Index reported that Alloy lists progesterone from $23 a month, priced separately from estrogen. Prices change, so check before you compare.

You want your sleep back and your night sweats gone without guessing at a hormone schedule. Take the quiz to see whether bioidentical estrogen fits your plan, and our clinical team can talk through how progesterone fits where you are in perimenopause.