GLP-1 medicines and pregnancy planning: stop before you try
GLP-1 weight-loss medicines like semaglutide (Wegovy, Ozempic) and liraglutide (Saxenda) should not be used during pregnancy or when you are trying to conceive. The labels say to stop semaglutide at least 2 months before a planned pregnancy because the medicine stays in the body a long time, and to stop the moment a pregnancy is recognised. Use reliable contraception while on the medicine so you do not get pregnant before the washout is complete. Preconception weight loss can help fertility and lower pregnancy risk, but the drug itself is stopped. Your doctor decides your exact plan.
If you take a GLP-1 weight-loss medicine (semaglutide as Wegovy or Ozempic, or liraglutide as Saxenda) and you want to get pregnant, the plan is simple: stop the medicine before you start trying. The US labels say to stop semaglutide at least 2 months before a planned pregnancy because the drug has a long half-life and lingers in the body, and to stop the moment a pregnancy is recognised. Use reliable contraception while you are on the medicine so you do not conceive before the washout is done. There is no proven safe level of these drugs in human pregnancy, so the honest rule is no GLP-1 during conception attempts or pregnancy. Your doctor decides the exact timing for you.
The baseline: why GLP-1s are stopped before conception
GLP-1 medicines are not approved for use in pregnancy, and the labels tell users to stop before a planned pregnancy. The reason is that animal reproduction studies found harm to the developing baby, and there is not enough human pregnancy data to prove safety. The Wegovy (semaglutide) label states plainly that 'Based on animal reproduction studies, there may be potential risks to the fetus from exposure to semaglutide during pregnancy.' In animals, semaglutide caused 'embryofetal mortality, structural abnormalities and alterations to growth' at exposures close to the human dose. The Saxenda (liraglutide) label is even more direct about pregnancy, saying 'weight loss offers no benefit to a pregnant patient and may cause fetal harm', and that liraglutide 'has been shown to be teratogenic in rats'. Note that the thyroid C-cell tumour worry, which is famous for these drugs, is a separate long-term cancer finding in rodents and is not the main concern here. The pregnancy concern is about the developing baby in animals, plus the lack of solid human safety data. Because of this, the rule is to stop before you try.
Preconception weight loss helps fertility and lowers pregnancy risk, so a GLP-1 can be kept going into early pregnancy to lock in the weight loss.
VerdictHalf right, and the dangerous half is wrong. It is true that losing weight before pregnancy can improve fertility and reduce pregnancy problems. ACOG guidance says 'preconception assessment and counseling are strongly encouraged for obese women and should include the provision of specific information concerning the maternal and fetal risks of obesity in pregnancy' and gives 'encouragement to undertake a weight-reduction program'. So the preconception weight loss idea is sound. But the GLP-1 must still be stopped before conception, not continued into pregnancy. The Wegovy label says to 'discontinue WEGOVY at least 2 months before a planned pregnancy', and the Saxenda label says 'weight loss offers no benefit to a pregnant patient and may cause fetal harm'. The weight-loss benefit belongs to the preconception phase; the pregnancy phase must be drug-free. Your doctor helps you keep the weight off through food and movement once the drug is stopped.
Staying safe around pregnancy on a GLP-1
The bottom line
GLP-1 weight-loss medicines are stopped before conception, not used in pregnancy. The honest, label-backed plan is: use reliable contraception while on semaglutide (Wegovy, Ozempic) or liraglutide (Saxenda); for semaglutide stop at least 2 months before you try to conceive because of its long half-life, and for Saxenda let your doctor set the timing since the label gives no official pre-conception gap; and the moment a pregnancy is recognised, stop the medicine and tell your doctor the same day. The animal studies show fetal harm and there is not enough human pregnancy safety data, so the rule is no GLP-1 during conception attempts or pregnancy. Preconception weight loss is genuinely useful for fertility and for lowering pregnancy risk, and ACOG encourages a weight-reduction program before pregnancy for women with obesity, but that work is done before the drug-free pregnancy begins, not during it. Your doctor decides your exact stop date, contraception, and weight-maintenance plan.