GLP-1 medications carry a clear directive: stop before becoming pregnant. Both semaglutide and tirzepatide showed adverse effects in animal reproduction studies. Here's what you need to know for planning.
The Official Guidance
Semaglutide and tirzepatide are both classified as having potential fetal risk based on animal data. The prescribing information for both medications recommends discontinuation at least 2 months before a planned pregnancy. Some clinicians recommend a longer washout — up to 3 months — for extra caution, particularly with longer-acting formulations.
The Fertility Surprise
Multiple reports — both clinical and anecdotal — describe unexpected pregnancies in patients taking GLP-1 medications. The mechanism isn't fully understood, but weight loss itself improves fertility in people with obesity-related anovulation. Additionally, GLP-1 medications may alter absorption of oral contraceptives due to delayed gastric emptying.
If you're of reproductive age: Use reliable contraception while on GLP-1 medication. If you're using oral birth control, discuss backup methods with your prescriber — delayed absorption may reduce efficacy, particularly during the first weeks after starting or dose adjustments.
Planning a Pregnancy
If pregnancy is in your plans, discuss a timeline with your prescriber before starting GLP-1 treatment. The typical approach: use the medication to reach a healthier weight, then taper and stop at least 2 months before actively trying to conceive. The weight loss and metabolic improvements you achieve before pregnancy benefit both you and the baby — but the medication itself must be stopped.
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