Peptide library / Sexual & reproductive / Atosiban
Atosiban
An oxytocin receptor blocker used to delay preterm labor in Europe.
Effects studied or claimed
What it is used or promoted for, and where each effect has actually been seen
- Delay preterm birthFDA approved
How it is thought to work
Atosiban blocks oxytocin and vasopressin receptors in the uterus, reducing contractions.
What the evidence shows
Trials show a delay of delivery by about 48 hours with fewer side effects than beta-agonists.
Safety and unknowns
Generally well tolerated, with nausea and headache.
Regulatory status
Approved in the EU. Not FDA-approved.
Regulatory status changes quickly. This entry was last reviewed on 27 October 2026. Confirm current status with the FDA before relying on it.
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General information, not medical advice. Do not buy or inject unregulated peptides.