Oxytocin
Also known as: Pitocin, Syntocinon, Love Hormone, Bonding Hormone
Neurohypophysial Peptide | Social Bonding & Reproductive Hormone
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.
Key benefits
- FDA-approved for labor induction with precise dosing via IV
- Immediate onset in obstetric settings
- Established safety profile in clinical use
- Researched for anxiety, PTSD, autism, sexual dysfunction
Mechanism of action
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.
Molecular data
- Type
- Cyclic nonapeptide
- Half-life
- 3-6 minutes
Sequence
Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH2
Indications
What the research community uses this compound for, with self-reported effectiveness.
Obstetric (FDA Approved)
Labor Induction
Most effectiveInitiates or augments uterine contractions when vaginal delivery medically indicated.
Postpartum Hemorrhage Control
Most effectiveControls postpartum bleeding through uterine contraction stimulation during third stage.
Incomplete Abortion Management
EffectiveAdjunctive therapy for incomplete or inevitable abortion in second trimester.
Research/Emerging
Autism Spectrum Disorders
ModerateExtensive research with mixed results on social functioning; optimal dosing unclear.
PTSD Augmentation
EffectiveCombined with exposure therapy; shows reduced PTSD/depression symptoms.
Social Anxiety
ModerateDecreases amygdala reactivity to social threats; normalizes brain connectivity.
Sexual Function
EffectiveImproves libido, arousal, orgasm intensity in both sexes.
Dosing protocols
Common protocols by delivery method. Adjust the curve below to model accumulation in your own cycle.
Injectable
IV or IM administration in clinical settings. IV provides immediate onset; requires continuous infusion and monitoring for labor use.
| Protocol | Dose | Frequency | Route / duration |
|---|---|---|---|
| Labor Induction | 0.5-2 mU/min initial, titrate to 1-2 mU/min every 30-60 min | Continuous IV infusion | IV (diluted) |
| Postpartum Hemorrhage Prevention | 10 units IM or 10-40 units in IV solution | Single dose after placental delivery | IM or IV infusion |
Preparation
You will need
- Oxytocin injection USP (10 units/mL)
- Compatible IV solution (0.9% NaCl or Lactated Ringer's)
- IV infusion pump (required)
- Continuous fetal monitoring equipment
Steps
- Hospital/clinical procedure—qualified healthcare professionals only
- Dilute oxytocin in compatible IV solution per facility protocol
- Typical dilution: 10 units in 1000mL = 10 mU/mL
- Use infusion pump for precise rate control
- Monitor uterine contractions and fetal heart rate continuously
Work out the water volume and syringe units in the reconstitution calculator →
Nasal
Nasal spray delivers oxytocin directly to brain via olfactory and trigeminal pathways, bypassing blood-brain barrier. Primary research route for psychological/social effects.
| Protocol | Dose | Frequency | Route / duration |
|---|---|---|---|
| Social anxiety/bonding enhancement | 20-24 IU | Once daily or before social situations | Intranasal spray |
| Autism research protocols | 24-48 IU daily | Twice daily | Intranasal spray |
| PTSD therapy augmentation | 40 IU | Before therapy sessions | Intranasal spray |
| Sexual function enhancement | 24-40 IU | 30-45 minutes before activity | Intranasal spray |
Preparation
You will need
- Oxytocin nasal spray (compounded) or lyophilized powder
- Sterile saline or bacteriostatic water
- Metered dose nasal spray bottle
Steps
- If using pre-made compounded spray, proceed to use
- For powder: calculate desired concentration (typically 4-6 IU per 0.1mL)
- Add calculated volume of sterile saline to vial
- Gently swirl until fully dissolved—do not shake
- Transfer to sterile metered-dose nasal spray bottle
- Prime pump with 2-3 sprays before first use
- Store refrigerated 2-8°C; use within 30 days
Work out the water volume and syringe units in the reconstitution calculator →
Oral
Sublingual troches provide needle-free administration. Lower bioavailability (~4.5% vs 11% intranasal) requires higher doses.
| Protocol | Dose | Frequency | Route / duration |
|---|---|---|---|
| General wellness/bonding support | 50-100 IU | Once daily | Sublingual troche |
| Sexual function support | 100 IU | 30-45 minutes before activity | Sublingual troche |
Interactions
Pairwise interactions with other compounds you might be cycling — the same data behind the cycle builder's safety check.
Alcohol
AvoidAlcohol suppresses oxytocin release; reduces therapeutic effects.
Vasopressin (AVP)
MonitorStructurally similar; overlapping receptor affinity with potential additive effects.
SSRI Antidepressants
MonitorSSRIs may affect endogenous oxytocin; combined use requires healthcare provider oversight.
Selank
SynergisticComplementary anxiolytic effects—Selank modulates GABA; oxytocin acts on central receptors.
PT-141 (Bremelanotide)
SynergisticComplementary sexual function effects via different pathways.
Kisspeptin
SynergisticBoth involved in reproduction; kisspeptin stimulates GnRH; oxytocin enhances arousal.
BPC-157
CompatibleNo direct interactions; different mechanisms (tissue repair vs social function).
Timeline
Typical week-by-week effects reported in clinical and observational data.
- Injectable
IV: 1-3 minute onset, 30-60 minute duration; IM: 3-5 minute onset
- Intranasal
15-30 minute onset, peak 30-60 minutes, 2-4 hour duration
- Sublingual
30-45 minute onset, peak ~60 minutes, 2-4 hour duration
Safety
Reported adverse effects, contraindications, and what to monitor on cycle.
Common side effects
- Mild headache
- Nasal irritation (intranasal)
- Nausea or vomiting
- Transient blood pressure changes
Stop signs — stop and seek advice
- 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)
Contraindications
- Certain obstetric conditions (see prescribing info)
- Pregnancy (without medical supervision)
- Active sinus infection (intranasal)
- Severe hyponatremia
Monitoring
- Continuous electronic fetal monitoring during labor (injectable)
- Blood pressure monitoring
- Electrolyte levels if exceeding 24 IU daily long-term (intranasal)
Quality checks
What a legitimate product looks like, what should give pause, and what should make you stop.
Good signs
- 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
Warning signs
- Variable compounding quality between pharmacies
- Nasal congestion reduces intranasal absorption
- Sublingual has lower bioavailability than intranasal
Stop signs — don't use
- Cloudy, discolored, or particulate solution
- From unlicensed or unverified sources
- Improper storage or broken cold chain
References
Primary literature and clinical-trial data informing this entry.
Intranasal Oxytocin in Autism Spectrum Disorder
2021
N=290 children/adolescents; 48 IU daily; 24 weeks. Did not significantly improve social functioning vs placebo; highlights need for better patient selection.
Oxytocin Augmented Prolonged Exposure Therapy for PTSD
2019
Veterans with PTSD; 40 IU intranasal combined with PE therapy. Lower PTSD and depression symptoms; higher therapeutic alliance vs placebo.
Intranasal Oxytocin for Obesity
2024
N=61 adults with obesity; 24 IU four times daily; 8 weeks. No weight loss but significant reduction in caloric intake; improved mental health-related quality of life.
Last updated . How this page was sourced is described in the methodology.