“Ozempic causes miscarriage.”
What the evidence shows
The human data that exist are reassuring on this specific point. In a 2024 multicentre prospective cohort (Dao et al., BMJ Open) of 168 first-trimester GLP-1-exposed pregnancies, pregnancy-loss rates were about 23%, versus roughly 26% and 29% in the diabetes and overweight/obese reference groups — no statistically significant increase. Pooled safety data from regulatory trials (Parker et al., 2025) likewise found similar rates of nonviable pregnancy in exposed and placebo groups. These sit alongside the JAMA Internal Medicine cohort showing no clear rise in major birth defects.
What we still don’t know
All of this is observational, with modest numbers and wide confidence intervals, covering inadvertent early exposure rather than deliberate use through pregnancy — so a small effect can't be fully excluded. Baseline miscarriage risk is already higher in people with obesity and diabetes (the populations who take these drugs), which makes individual anecdotes easy to misattribute to the medicine.
Why the claim misleads
Stating 'Ozempic causes miscarriage' as fact asserts causation the evidence specifically does not show — the comparative loss rates are, if anything, slightly lower than in comparable non-users. The reason these drugs are still stopped in pregnancy is precaution and the lack of a green light for ongoing use, not a demonstrated miscarriage risk. Anyone with an exposure or a loss deserves a calm, prompt conversation with an obstetric clinician, not a scare headline.
Graded by The Peptide Era · evidence, not hype