Oxytocin · Approved for labour, researched for much else

Oxytocin is a peptide hormone with an FDA-approved injectable form (Pitocin) for inducing or augmenting labour and controlling postpartum bleeding. Separately, intranasal oxytocin has been studied for social behaviour, anxiety, autism and sexual function — mostly in small trials with inconsistent results.

Oxytocin acts on receptors in the uterus and in brain regions involved in social bonding. The approved use is well characterised; the behavioural research is early and often fails to replicate at larger scale.

Injectable oxytocin is FDA-approved for obstetric use only. Intranasal and other forms for behavioural purposes are not approved; compounded versions are a prescriber's off-label decision. This is a general note, not legal advice.