Oxytocin protocol · PepGuide

By route

Intranasal

24–40 IU (~3 sprays/nostril at ~4 IU each) · As needed or 1–2×/day

Most common route for social/mood effects. Onset ~30–45 min.

SubQ

5–10 IU (~50–100 mcg) · As needed

Faster, stronger peripheral effect; lower CNS targeting than intranasal.

Phase	How often	Dose	Units	Notes
Intranasal	As needed or 1–2×/day	24–40 IU (~3 sprays/nostril at ~4 IU each)	–	Most common route for social/mood effects. Onset ~30–45 min.
SubQ	As needed	5–10 IU (~50–100 mcg)	–	Faster, stronger peripheral effect; lower CNS targeting than intranasal.

Short-acting; effects are situational, not cumulative.

Cycle & timing

Cycle: Use as-needed, or 24 IU twice daily for 4–12 weeks in chronic-dosing protocols.

Timing: ~30–45 min before the desired social/intimacy effect (intranasal).

Where: Intranasal spray (primary) or SubQ abdomen.

What to expect

Situational increase in warmth, trust, calm, and intimacy. Effects are short-lived and context-dependent.

How much to buy

For 8-wk @ ~24 IU 2/day; far less if as needed:

3

× 2mg vials

1

× 10mg vials

Men & women

Bonding and intimacy in both sexes; in women, sensitivity can shift with estrogen across the cycle.

Recommended mixes

Vial	Water	Strength
2 mg	1 mL	2 mg/mL (~1000 IU/mL)
10 mg	5 mL	2 mg/mL (~1000 IU/mL)

2 mg: ~1 mg ≈ 500 IU. For nasal use, transfer to a metered spray.

10 mg: 1 unit (SubQ) = 0.02 mg

Storage

PowderFreeze-dried: -4°F.
MixedReconstituted: 36–46°F; nasal bottle short-dated. Protect from light.

Don't use if: Pregnancy (uterotonic, can trigger contractions) · Hyponatremia or conditions of water overload · Hypersensitivity to oxytocin

Stop if you notice

Headache, confusion, nausea (possible hyponatremia)
Emotional flattening or worsened mood
Any uterine cramping (if applicable)

Side effects

Usually mild, nasal irritation, headache, mood shifts. Higher/frequent doses can blunt receptors or cause emotional flattening.

Drug interactions

Vasoconstrictors / some migraine drugs: additive cardiovascular effects. Excess fluids: compounds hyponatremia risk.

Labs

Sodium if using high/frequent doses. Generally none for occasional intranasal use. Out of range? Low sodium = too much / too frequent dosing → ease off.

What these labs mean →

Warnings

Antidiuretic (vasopressin-like) effect at high doses, water retention / hyponatremia risk. Receptor blunting / emotional flattening with frequent high dosing. Can intensify or distort emotional responses, situational. Cardiovascular effects (BP/heart rate) at high doses.

Patient education

Short-acting and situational, not a daily mood drug for most. Don't over-dose; more can blunt the effect and flatten emotion. Avoid in pregnancy. Don't combine high doses with excessive water intake.

These apply on top of the universal safety rules.

Pairs well with

PT-141

intimacy

PT-141 (Bremelanotide)

Kisspeptin

libido/hormonal

Selank

anxiolytic

Selank

Avoid with

Pregnancy

uterotonic

Hyponatremia / excessive water intake

antidiuretic effect at high doses

Overuse

receptor blunting

Can Oxytocin + PT-141 (Bremelanotide) share a syringe?

Depends on timing. Reproductive and hormonal peptides are compatible, but doses and timing vary widely. Combine only what you truly co-time. If unsure, separate.

What it does

Oxytocin is a 9-amino-acid neurohormone acting on oxytocin receptors in the brain and periphery. Centrally it modulates social bonding, trust, stress buffering, and mood; peripherally it affects uterine and lactation physiology. Intranasal delivery targets central effects; SubQ also used. Peak CNS effect ~30–45 min after intranasal dosing.

References

researchdosing peptidedosages PubMed thepeptidereport Oxytocin sex differences

From the guide, page 71.