Semaglutide vs Tirzepatide for PCOS

No study has put semaglutide and tirzepatide head to head in women with PCOS, so neither one has been shown to work better for your cycles or your insulin resistance. Semaglutide is the one with a randomized PCOS trial. Added to metformin for 16 weeks, it brought regular periods back in more women and took off more weight than metformin alone. Tirzepatide has large weight-loss trials behind it but no PCOS trial in the research for this page, and its label says it can make birth control pills less reliable. The right pick depends on your cycles, your birth control and whether pregnancy is in your plans.

Is there a study comparing semaglutide and tirzepatide for PCOS?

No. None of the research behind this page tests semaglutide against tirzepatide in women with PCOS. Neither drug has been shown to beat the other for PCOS cycles or insulin resistance.

Semaglutide has a randomized trial in 100 women with PCOS. All were overweight or obese. For 16 weeks, half took metformin 1000 mg twice a day, and the other half took the same metformin plus semaglutide 1 mg once a week.

Tirzepatide's weight evidence comes from large 72-week trials in adults with obesity or overweight. According to the Zepbound prescribing information, it took off significantly more weight than placebo, and the drop showed up regardless of age, sex or starting BMI. Those trials were not PCOS trials.

A review of GLP-1 drugs in women of reproductive age reports that studies in PCOS show improvements in weight and insulin resistance, along with more regular periods and ovulation. Tirzepatide works on two hormone receptors, GIP and GLP-1, so those GLP-1 reviews don't tell us exactly how it performs in PCOS.

What did semaglutide do for women with PCOS in a trial?

Periods came back more often on semaglutide plus metformin. Every woman in the trial started with infrequent periods. After 16 weeks, 72.5% of the semaglutide group had regular cycles again, compared with 42.3% on metformin alone.

Women on semaglutide plus metformin lost about 6.1 kg (around 13 pounds) in 16 weeks. Women on metformin alone lost about 2.3 kg (around 5 pounds). Only the semaglutide group had a significant drop in waist-to-hip ratio and in CRP, a marker of inflammation.

Insulin resistance improved in both groups. Fasting insulin, HbA1c (a blood sugar marker) and HOMA-IR (a score that estimates insulin resistance) all came down. Semaglutide did not pull significantly ahead of metformin on those measures. If insulin resistance is your main concern, both arms of the trial helped it, and the semaglutide group's extra advantage showed up in cycles and weight.

The trial enrolled women who had been trying to get pregnant for more than two years. Semaglutide was stopped at week 16, and everyone stayed on metformin. Over the next 24 weeks, 35% of the semaglutide group got pregnant naturally, compared with 15% of the metformin group. Total pregnancies, 50% vs 32.5%, were not significantly different. It was a small study at a single center, and it was open-label, which means everyone knew which treatment they were getting.

How do semaglutide and tirzepatide compare side by side?

Will my period come back on a GLP-1, and do I need backup birth control?

It can. These drugs can bring ovulation back, especially in women with obesity and PCOS. That's good news if your cycles have been all over the place. It can also surprise you with a pregnancy you didn't plan.

In the semaglutide PCOS trial, women used barrier contraception during the 16 weeks of treatment.

If you take the pill and choose tirzepatide, the label gives you two options. You can switch to a non-oral method. You can also add a backup method for the first 4 weeks and for 4 weeks after every dose increase.

If you do get pregnant, a 2026 review of 36 studies found that use around conception or in early pregnancy was not consistently linked to more birth defects, stillbirth or newborn deaths. Data on staying on these drugs through pregnancy are limited. Tell your clinical team as soon as you think you might be pregnant.

Which one should I ask for if I have PCOS?

If getting your cycles back is the goal and you want a drug with a PCOS trial behind it, semaglutide is the one with that evidence. In the trial, it restored regular cycles in 72.5% of women, compared with 42.3% on metformin alone.

Weight loss looks like the lever. In the same trial, the women who lost the most weight had better cycle recovery than the women who lost less. That's where tirzepatide's case comes in. It has large 72-week weight-loss trials and works on two hormone receptors instead of one, though it hasn't been tested in PCOS in the research for this page.

If acne or chin hair bothers you most, tell your clinical team. In a 12-week trial of liraglutide, an older daily GLP-1, liraglutide plus metformin beat a birth control pill plus metformin for weight, waist size and ovulation. The pill did better at lowering testosterone. Those results are for liraglutide, not semaglutide or tirzepatide.

Dose increases can be the rough patch. One r/Zepbound user wrote: "Had a little setback when I upped my dose to 5mg last month and had some pretty rough GI side effects and dehydration. But I think I got it sorted out now and went back down to the 2.5 dose and have been feeling much better this week." Another r/Zepbound user summed up the trade-off: "I love what this medication has done for me and my relationship with food but sometimes these side effects are draining (literally)."

Our clinical team can prescribe semaglutide or tirzepatide if one of them fits your goal, your birth control and your pregnancy plans. Take the quiz so our clinical team can look at your cycles, your birth control and whether pregnancy is in your plans. Then you'll see whether semaglutide or tirzepatide fits your plan.