Oxytocin
/ Nonapeptide (9 amino acids with disulfide bond); OT receptor agonistALIAS · Pitocin (approved brand)
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FDA-approved (Pitocin) for labor induction and postpartum bleeding. Extensive clinical use since 1953.
Oxytocin is a 9-amino-acid peptide hormone produced in the hypothalamus and released from the posterior pituitary. It signals through the oxytocin receptor (OTR), a G-protein-coupled receptor, driving uterine contraction during labor and milk ejection during lactation. Central effects on social bonding and trust are widely studied but therapeutic applications in behavioral indications remain investigational.
Extensive. FDA-approved for labor induction and control of postpartum bleeding (Pitocin). Intranasal oxytocin has been widely studied for autism spectrum disorder, PTSD, and social-cognition indications with mixed results.
Labeled adverse events for intravenous use include uterine hyperstimulation, water intoxication (antidiuretic effect at high doses), hypotension, and arrhythmias. Intranasal oxytocin in research settings has shown a generally mild safety profile.
Regulatory status
- FDA status:
- FDA-approved
- Compounding:
- Not eligible for compounding (approved, not in shortage)
Behavioral-indication trials (autism spectrum disorder, PTSD) have produced inconsistent results. Popular-press characterization of oxytocin as the "love hormone" oversimplifies a complex neuropeptide with context-dependent effects.