Oxytocin
Neurohypophysial Peptide · Social Bonding & Reproductive Hormone
Nine-amino-acid peptide hormone produced in hypothalamus, released by posterior pituitary. Functions in social bonding, trust, empathy, reproduction, childbirth, lactation. FDA-approved synthetically for labor induction and postpartum hemorrhage.
Overview
Nine-amino-acid peptide hormone produced in hypothalamus, released by posterior pituitary. Functions in social bonding, trust, empathy, reproduction, childbirth, lactation. FDA-approved synthetically for labor induction and postpartum hemorrhage.
Binds oxytocin receptors on uterine smooth muscle, triggering calcium influx and myometrial contractions. Stimulates prostaglandin release. In CNS, modulates GABAergic, serotonergic, dopaminergic neurotransmission; reduces cortisol and HPA axis activity.
Research indications
What the compound has been studied for, grouped by body system. Effect size is the reported magnitude where it was measured — not a recommendation.
Initiates or augments uterine contractions when vaginal delivery medically indicated.
Controls postpartum bleeding through uterine contraction stimulation during third stage.
Adjunctive therapy for incomplete or inevitable abortion in second trimester.
Extensive research with mixed results on social functioning; optimal dosing unclear.
Combined with exposure therapy; shows reduced PTSD/depression symptoms.
Decreases amygdala reactivity to social threats; normalizes brain connectivity.
Improves libido, arousal, orgasm intensity in both sexes.
A large effect in a weak study and a small effect in a strong one are different things. Effect size is never evidence of use in people.
- Class
- Cyclic nonapeptide
- Chain length
- 9 residues
- Molecular weight
- 1007.19 Da
- Half-life
- ~5 min
- Typical dose
- Intranasal: 20-24 IU; Injectable: 10-40 IU; Sublingual: 50-100 IU
- Frequency
- As needed for social/sexual support, or 1-2x daily for anxiety/PTSD protocols; max 1 dose per 24hr for sexual function
- Cycle length
- As needed for research applications; 4-12 weeks for anxiety/autism protocols
- Storage
- Refrigerate at 2-8°C; protect from light
Molecular data
- Type
- Cyclic nonapeptide
- Molecular weight
- 1007.19 Da
- Chain length
- 9 residues
- Half-life
- 5 min
Dosing reference
Doses reported in the literature and by suppliers. These are a record of what has been used in research — reference, never instruction.
| Context | Route | Amount | Frequency |
|---|---|---|---|
| Labor Induction | IV (diluted) | 0.5-2 mU/min initial, titrate to 1-2 mU/min every 30-60 min | Continuous IV infusion |
| Postpartum Hemorrhage Prevention | IM or IV infusion | 10 units IM or 10-40 units in IV solution | Single dose after placental delivery |
| Social anxiety/bonding enhancement | Intranasal spray | 20-24 IU | Once daily or before social situations |
| Autism research protocols | Intranasal spray | 24-48 IU daily | Twice daily |
| PTSD therapy augmentation | Intranasal spray | 40 IU | Before therapy sessions |
| Sexual function enhancement | Intranasal spray | 24-40 IU | 30-45 minutes before activity |
| General wellness/bonding support | Sublingual troche | 50-100 IU | Once daily |
| Sexual function support | Sublingual troche | 100 IU | 30-45 minutes before activity |
Interactions
Structurally similar; overlapping receptor affinity with potential additive effects.
Complementary anxiolytic effects—Selank modulates GABA; oxytocin acts on central receptors.
Complementary sexual function effects via different pathways.
Both involved in reproduction; kisspeptin stimulates GnRH; oxytocin enhances arousal.
No direct interactions; different mechanisms (tissue repair vs social function).
SSRIs may affect endogenous oxytocin; combined use requires healthcare provider oversight.
Alcohol suppresses oxytocin release; reduces therapeutic effects.
Quality checklist
- ✓FDA-approved pharmaceutical product from licensed pharmacies (injectable)
- ✓Clear, colorless solution without particles or discoloration
- ✓Proper packaging with verified lot number, expiration, concentration
- ✓Licensed compounding pharmacy source with USP compliance
- !Variable compounding quality between pharmacies
- !Nasal congestion reduces intranasal absorption
- !Sublingual has lower bioavailability than intranasal
- ×Cloudy, discolored, or particulate solution
- ×From unlicensed or unverified sources
- ×Improper storage or broken cold chain
What to expect
Safety
- Mild headache
- Nasal irritation (intranasal)
- Nausea or vomiting
- Transient blood pressure changes
- Uterine hyperstimulation or fetal distress (injectable)
- Severe or persistent headache
- Signs of water intoxication (confusion, seizures, swelling)
- Severe nasal irritation or bleeding
- Allergic reaction (rash, breathing difficulty)
- Certain obstetric conditions (see prescribing info)
- Pregnancy (without medical supervision)
- Active sinus infection (intranasal)
- Severe hyponatremia
FAQ
Does intranasal oxytocin actually improve social anxiety, or is it just a placebo?
Research shows oxytocin decreases amygdala reactivity to social threats and normalizes brain connectivity related to social processing. It's not a placebo, but it's not a miracle either. The effects are measurable in brain imaging and behavioral tests, though the magnitude varies between individuals. Many people need consistent dosing to see benefits.
Can I use oxytocin for sexual function without a medical reason?
Yes, it's researched for sexual enhancement—the file lists sexual function as an indication with 24-40 IU taken 30-45 minutes before activity. However, it's FDA-approved only for obstetric use. Research/compounded forms are used off-label for sexual dysfunction and enhancement, but quality and safety vary depending on source.
Will alcohol interfere with oxytocin's effects?
Yes. Alcohol suppresses endogenous oxytocin release, which would significantly reduce any therapeutic or enhancement benefits. You should avoid alcohol if you're using oxytocin for anxiety, bonding, or sexual function.
How is intranasal oxytocin different from the obstetric injection?
The obstetric injection (FDA-approved Pitocin) is high-dose IV for labor induction with immediate onset and precise dosing control. Intranasal oxytocin delivers much lower doses and achieves brain delivery via olfactory pathways with slower onset (15-30 minutes) but longer duration (2-4 hours). They're essentially different formulations for different purposes.