GLP-1s and Pregnancy: When to Stop, Birth Control, and What If You're Already Pregnant

If you’re on a GLP-1 and want to get pregnant, plan to stop it months ahead, not weeks. For semaglutide (Ozempic, Wegovy), diabetes guidelines say at least two months before you start trying. For tirzepatide (Zepbound, Mounjaro) the label gives no number, so ask your doctor. If you’re already pregnant, the data so far is reassuring: stop the medicine, call your doctor, and don’t panic.

Why come off first

These drugs haven’t been shown to be harmful in pregnancy. They’ve never been studied in pregnancy, and that’s a different thing. In animal studies there were problems with the pregnancies. In people, that pattern hasn’t shown up, but the studies are short and no one has followed the children for long. Certainty isn’t coming, so the safe answer is to stop before you try.

If you’re already pregnant

This is where the evidence is reassuring. A large study across six countries found that women with type 2 diabetes who took a GLP-1 around conception or early in pregnancy, often before they knew, had no higher risk of major birth defects than women on insulin. The authors call it reassuring but want more studies, and it didn’t include people taking these drugs for weight alone. Stop the medicine and call your doctor.

Birth control while you’re on one

Some GLP-1 medicines can make the birth control pill work less well. Tirzepatide (Zepbound) and the new pill Foundayo both carry this warning. Their labels advise adding a backup method, or using a non-pill method, for about a month after you start and after every dose increase. If you’re not planning a pregnancy, ask whoever prescribes your birth control.

Keep the work when the medicine stops

Coming off before pregnancy shouldn’t mean being left on your own. What has to hold is the work you’ve done with your doctor: how you eat, enough protein, strength training, and someone actually checking in. And you shouldn’t have to raise this yourself. If children are anywhere in your next year, your doctor should bring it up.

Sources

• American Diabetes Association, Standards of Care: stop semaglutide at least two months before a planned pregnancy
• Zepbound prescribing information: pregnancy, animal data, and oral contraceptives
• Foundayo prescribing information: backup contraception for 30 days after starting and after each dose increase
• Cesta et al., JAMA Internal Medicine, 2024: GLP-1 receptor agonists and other second-line diabetes medicines in early pregnancy (Nordic countries, US and Israel)