Oxytocin

Oxytocin is the body's 'love hormone' — best known for driving social bonding, trust, and connection (it also triggers labor contractions and milk letdown). Made in the brain and released by the pituitary, it's studied off-label for social and calming effects. Its one FDA-approved use is the synthetic form (Pitocin), a hospital-only injection for labor and post-birth bleeding — so it isn't a self-administered peptide, and the bonding and anxiety uses aren't backed by that approval.

Oxytocin is FDA-approved for obstetric use, given by IV infusion or injection under medical supervision, and studied off-label for social bonding and anxiety. The approved label and its clinical data describe only the obstetric use; the social-bonding, anxiety, and intranasal uses that draw research-community interest are off-label and not characterized by the approved evidence. Because oxytocin is chemically close to the hormone vasopressin, large doses can cause water retention and, rarely, dangerous water intoxication.

FDA-approved — Pitocin (Oxytocin Injection, USP), NDA 018261. The synthetic form is prepared to avoid vasopressin contamination. Prescription-only, hospital-administered for its labeled obstetric indications; not DEA-scheduled. ⚠️ Research-community / off-label interest (social/anxiolytic/intranasal use) is not an FDA-approved indication and is not what the label or its PK characterize. WADA: not named on the 2026 Prohibited List per the local archive check; confirm current edition before competition.

Oxytocin (Pitocin) is FDA-approved and prescription-only for obstetric use, administered by clinicians in a hospital; it is not a self-dosed peptide. It is not listed on the WADA Prohibited List as of the 2026 edition. VialWise is a research and educational reference, not medical advice — consult a licensed professional.

⚠️ For research and educational purposes only. Oxytocin (Pitocin) is an FDA-approved prescription drug for obstetric use, administered in a hospital under medical supervision. Information in this entry is informational, not medical advice. Always consult appropriate professional guidance before any decisions.

⚠️ The FDA-approved use is obstetric and hospital-administered — not a self-dosed peptide. Pitocin's labeled indications are labor induction/augmentation and control of postpartum bleeding, given by IV infusion pump (milliunits/min) or IM injection by clinicians. The label's pharmacology characterizes this use. The research-community "social/bonding/anxiolytic" interest (often intranasal) is off-label, not FDA-characterized, and outside what this entry's clinical data describe. This entry is included for educational completeness on an FDA-approved peptide hormone, not as a self-administration protocol.

⚠️ Oxytocin and vasopressin differ by only 2 amino acids — oxytocin has intrinsic pressor and antidiuretic effects. Per the FDA label, large doses can manifest vasopressin-like activity (water retention → water intoxication risk). This is a real hazard at high/prolonged dosing and a key reason the obstetric use is tightly supervised.

Oxytocin is a nine-amino-acid posterior-pituitary hormone, FDA-approved in synthetic form as Pitocin for obstetric use. It is one of the most-studied peptide hormones in medicine on its labeled indication.

Mechanism. Oxytocin binds specific receptors on uterine myometrium; receptor concentration rises through pregnancy and peaks in early labor, which is why the same dose produces very different responses depending on gestational timing. It promotes contraction by increasing intracellular Ca²⁺ (via myosin light-chain kinase). Because oxytocin and vasopressin (ADH) differ in only two of their eight ring/tail amino acids, oxytocin carries intrinsic pressor and antidiuretic activity that can appear at large doses — the basis for the water-intoxication hazard.

Clinical use (FDA-approved). Labor induction/augmentation where medically indicated (e.g., Rh problems, maternal diabetes, preeclampsia near term, premature membrane rupture), control of postpartum bleeding, and as an adjunct in incomplete/inevitable abortion. It is explicitly not indicated for *elective* labor induction. Administration is by IV infusion pump with continuous fetal/uterine monitoring, or IM postpartum — a supervised hospital procedure.

Pharmacokinetics. Rapid: a plasma half-life of about 1–6 minutes, cleared largely by kidney and liver, with only small amounts excreted unchanged. The fast clearance is why labor infusions can be stopped abruptly and the effect wanes quickly.

Research-community / off-label context. Outside obstetrics, oxytocin draws interest for social-bonding, anxiolytic, and related effects, frequently via intranasal routes. None of that is FDA-approved or characterized by the Pitocin label, intranasal PK and CNS penetration differ entirely from the IV/IM obstetric data, and this entry does not provide a protocol for it. The honest framing: oxytocin is an FDA-approved obstetric drug; the broader uses are investigational and outside this entry's evidence base.

Regulatory status. FDA-approved (NDA 018261), prescription-only, hospital-administered for labeled use; not DEA-scheduled. Not on the WADA 2026 Prohibited List (verify current edition).

Commonly reported

• Nausea, vomiting
• Cardiac arrhythmia, premature ventricular contractions
• Hypertensive episodes
• Postpartum hemorrhage, pelvic hematoma
• Anaphylactic reaction

Serious

• Water intoxication (convulsions, coma) — from the antidiuretic effect at large/prolonged doses; maternal deaths reported
• Uterine hypertonicity, spasm, tetanic contraction, or rupture (overdose/hypersensitivity)
• Severe hypertension, subarachnoid hemorrhage, afibrinogenemia
• Fetal: bradycardia, arrhythmias, and effects from induced uterine motility

Antepartum contraindications (label): significant cephalopelvic disproportion; unfavorable fetal positions; obstetric emergencies favoring surgery; fetal distress without imminent delivery; hyperactive/hypertonic uterus; conditions where vaginal delivery is contraindicated; hypersensitivity.[¹]

⚠️ Water-intoxication risk at large doses (antidiuretic effect) — limit total dose and duration.

Not for elective labor induction (insufficient benefit-risk data).

Pregnancy: this IS the obstetric use; administered only under indication + supervision.

Regulatory: prescription-only, hospital-administered for labeled use; not DEA-scheduled; not WADA-listed (verify current edition).

Peptide

A short chain of amino acids, the building blocks of proteins. Many compounds in this library are peptides.

Pituitary gland

A small gland at the base of the brain that releases growth hormone and other hormones.

Intravenous (IV)

delivered into a vein.

Half-life

Roughly how long the body takes to clear half of a dose. A long half-life is why some compounds can be taken only once a week.

1. Par Pharmaceutical. Pitocin (Oxytocin Injection, USP) Synthetic — prescribing information. US FDA, NDA 018261 (label revision 2021, s041).
2. WADA 2026 Prohibited List — oxytocin not listed.

• Cerebrolysin — same mechanism class
• P021 — same mechanism class
• PE-22-28 — same mechanism class
• Selank — same mechanism class
• Semax — same mechanism class
• Glutathione — shared research area