Ulipristal for PMDD: does it work?

The best evidence so far says yes, for many women, though it comes from a single trial. A 2021 randomized, double-blind trial gave 95 women with PMDD either 5 mg of ulipristal acetate a day or a placebo, for three 28-day cycles ( [1]).

Daily symptom scores on the DRSP dropped more with ulipristal than with placebo, and the difference held up statistically:

Mood and anger improved the most. Physical symptoms like bloating or breast tenderness didn't improve any more than with placebo, which is consistent with how a progesterone receptor modulator is thought to work: changing the hormone signal rather than the body's physical response to it.

In the main trial, women took 5 mg of ulipristal acetate once a day, every day, for three full cycles, not only in the days before a period ( [1]). That's different from some SSRIs, which some women take only in the luteal phase.

Ulipristal is a selective progesterone receptor modulator. It blocks progesterone from binding normally, which can suppress ovulation and quiet the hormone swings that seem to trigger PMDD symptoms in some women's brains.

Ulipristal is already approved in some countries for short courses to treat fibroids ( [2]). It hasn't been approved specifically for PMDD, so a doctor who prescribes it for PMDD today is doing so off-label, deciding the dose and length based on your history.

The PMDD trial measured results after three full months of daily treatment, when the biggest gains showed up ( [1]). It doesn't tell us how much relief you'd feel after just one cycle.

A separate observational study of women taking ulipristal for fibroids found that among the women whose periods stopped, most did so within 10 days, and 80% of all the women in the study noticed their PMS symptoms improve too ( [2]). That suggests the hormonal shift starts fairly fast, even if full symptom relief takes longer to settle.

If you start ulipristal for PMDD, plan to track at least two full cycles before you and your doctor judge whether it's working. A DRSP chart turns that into something concrete instead of relying on memory of the week before your period.

Ulipristal's biggest, most consistent effect is on your period, not on mood or energy.

• Periods often stop while you're taking it. In one study, 67% of women became amenorrhoeic, most within 10 days ( [2]).
• Periods typically came back within four weeks of stopping the medication.
• Most women in that study had no side effects, or only occasional ones.
• Pelvic pain improved for 70% of women, though pain and periods sometimes returned once treatment stopped.

Ulipristal hasn't been studied long enough in PMDD specifically to know its full side effect profile outside one randomized trial and one observational study. If something feels wrong, tell your doctor rather than waiting it out.

No PMDD trial has published a detailed list of who shouldn't take ulipristal, so this comes from how it's already used for fibroids and emergency contraception.

Because ulipristal works on progesterone receptors, doctors typically avoid prescribing it, or watch you more closely, in a few situations:

• During pregnancy, or if pregnancy is possible without reliable contraception
• If you have liver disease, since liver health is checked before starting and periodically during treatment

That's standard caution for this drug class, not something specific to PMDD.

If you have liver disease, are pregnant, or are trying to become pregnant, tell your doctor before considering ulipristal. A doctor can also talk you through what happens if symptoms return once you stop, since that's what the 2017 observational study on ulipristal for fibroids found for both periods and pain ( [2]).

Ulipristal is one option, not the whole picture. Guidelines for PMDD typically recommend a combination of these, and a doctor decides what fits your history:

• SSRIs, sometimes taken only in the luteal phase
• Certain hormonal contraceptives
• CBT

PMDD treatment: what actually helps covers those options in more depth.

While you wait to see whether a treatment is working, you still have the premenstrual days in between. Niyora is a PMS and PMDD support app. Its Moon tool lets you write down what happened in a fight, see it from another angle, and draft a reply you can hold onto for 20 minutes instead of sending something you'll regret.

A PMDD specialist can help you weigh ulipristal against other options, and PMDD, explained is a good place to start if you're not sure the pattern fits. For more on what the research says across treatments, see PMS and PMDD research, summarised.