Orexin-A vs PT-141
Head-to-head comparison of Orexin-A (Hypocretin-1 (Orexin-A)) and PT-141 (Bremelanotide (Melanocortin Receptor Agonist)) — benefits, dosing, side effects, research data, and where to buy.
| Property | Orexin-A | PT-141 |
|---|---|---|
| Category | Cognitive Enhancement | Performance |
| Full Name | Hypocretin-1 (Orexin-A) | Bremelanotide (Melanocortin Receptor Agonist) |
| Molecular Weight | 3562 Da | 1,025.2 Da |
| Half-Life | Minutes to <1 hour | ~2.7 hours |
| Amino Acids | 33 | 7 |
| Typical Dose | Research-only; no validated human dose | 1.75 mg |
| Route | Intracerebroventricular/Intranasal | SC |
| Purity | ≥98% | — |
| Studies Count | 42 | 178 |
| Research Status | Pre-clinical | FDA Approved |
Orexin-A Benefits
- ✓wakefulness
- ✓attention
- ✓memory consolidation
- ✓fatigue resistance
PT-141 Benefits
- ✓Enhances sexual desire and arousal
- ✓Works through CNS (not vascular)
- ✓FDA-approved for HSDD
- ✓Effective for both men and women
- ✓Does not require sexual stimulation to work
Orexin-A Dosing
Research-only i.c.v. microgram/nanomolar studies|intranasal experimental use|no established human protocol
PT-141 Dosing
Standard: 1.75 mg SC, 45 min before activity|Max frequency: Once every 24 hours|Max: 8 doses per month|Men (off-label): 1-2 mg SC as needed
Orexin-A Side Effects
- ⚠insomnia
- ⚠headache
- ⚠blood pressure changes
PT-141 Side Effects
- ⚠Common: Nausea (40%), flushing, headache, injection site reactions
- ⚠Moderate: Elevated blood pressure (transient), fatigue
- ⚠Serious: Focal hyperpigmentation with repeated use
- ⚠Contraindications: Uncontrolled hypertension, cardiovascular disease
Research Overview
Orexin-A
Preclinical studies link orexin signaling to arousal, learning, and memory consolidation, making orexin-A a candidate for cognition-related research. It is not an approved cognitive enhancer and remains an experimental peptide.
PT-141
PT-141 has robust clinical evidence including multiple Phase III trials. FDA-approved in 2019. Unique mechanism of action through melanocortin-4 receptors in the brain. Well-characterized safety and efficacy profile.
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