Bremelanotide (PT-141)
FDA ApprovedMelanocortin receptor agonist
PT-141 (Bremelanotide) is a synthetic peptide that acts as a melanocortin receptor agonist, particularly targeting MC3R and MC4R. It has been studied in preclinical and clinical research contexts for its effects on melanocortin signaling pathways. Published research has examined its pharmacological profile and receptor selectivity. RaysunPeptide supplies PT-141 for qualified research and laboratory applications.
Mechanism of Action
Selectively activates melanocortin receptors (MC3R/MC4R) in the central nervous system, triggering sexual arousal pathways independent of peripheral vascular mechanisms. Works within 45 minutes with effects lasting 6-12 hours.
Key Benefits
Molecular Data
Dosing Protocols
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| Female HSDD (FDA-approved) | 1.75mg | As needed, max 1 dose/24hr | SubQ |
| Male Erectile Dysfunction | 1-2mg | As needed, 45-60min before activity | SubQ |
| Female Arousal Disorder | 0.75-1.25mg | As needed, max 1 dose/24hr | SubQ |
| Low Starting Dose | 0.5mg | Test dose for tolerance assessment | SubQ |
Research Indications
Sexual Health
FDA-approved for treatment of HSDD in premenopausal women.
Effective in men including PDE5 inhibitor-resistant cases via CNS pathways.
Enhances sexual arousal and desire in women.
Quality of Life
Reduces distress related to low sexual desire.
Enhanced satisfaction reported in clinical trials.
Peptide Interactions
PT-141 works centrally; PDE5 inhibitors work peripherally - monitor for additive BP effects.
Both are melanocortin agonists; combining risks excessive activation and side effects.
PT-141 can transiently lower blood pressure - monitor closely.
Both lower BP and cause flushing - limit intake to avoid excessive hypotension.
Risk of severe hypotension - contraindicated with heart condition medications.
Different mechanisms; no known interactions.
May work synergistically for sexual dysfunction through different pathways.
Different pathways (melanocortin vs GnRH) - no receptor overlap but monitor BP effects.
What to Expect
Side Effects & Safety
Common (Generally Mild)
- •Nausea (40%)
- •Flushing (20%)
- •Headache (11%)
- •Injection site reactions
Stop Signs (Seek Medical Attention)
- ⚠Severe or persistent nausea/vomiting
- ⚠Significant blood pressure drop or dizziness
- ⚠Chest pain or irregular heartbeat
- ⚠Severe headache or vision changes
- ⚠Prolonged erection exceeding 4 hours
Contraindications
- ✕Uncontrolled hypertension
- ✕Cardiovascular disease
- ✕Use of nitrate medications
- ✕Pregnancy or breastfeeding
Quality Checklist
Good Signs ✓
- FDA-approved pharmaceutical grade (Vyleesi) from licensed pharmacy
- White crystalline powder (pure PT-141)
- Clear solution when reconstituted
- Proper labeling with concentration and purity
Warning Signs !
- Compounded versions - ensure pharmacy is licensed and follows USP standards
Bad Signs ✕
- Colored or oily appearance indicating impurities or degradation
- Cloudy solution after reconstitution
- Unknown source without quality documentation
References
Two identical phase 3, randomized, double-blind, placebo-controlled trials (NCT02333071 and NCT02338960). Bremelanotide 1.75mg SubQ significantly improved sexual desire and reduced related distress in premenopausal women with HSDD.
View on PubMed →Intranasal PT-141 produced dose-dependent increase in erectile activity at doses >7mg, with onset in ~30 minutes. Safe and well-tolerated in both healthy men and ED patients.
View on PubMed →Bremelanotide activates MC4R in the medial preoptic area of the hypothalamus, increasing dopamine release. CNS mechanism of action independent of peripheral vascular effects.
View on PubMed →342 men with ED unresponsive to sildenafil randomized to 10mg bremelanotide intranasal spray vs placebo. Demonstrated effectiveness in PDE5 inhibitor-resistant cases.
View on PubMed →FAQs
How is PT-141 different from Viagra if both treat erectile dysfunction?
Completely different mechanisms. Viagra (sildenafil) works peripherally by dilating blood vessels in the penis (PDE5 inhibition). PT-141 works centrally in the brain via melanocortin receptors to trigger sexual desire and arousal independent of blood flow.
Why does PT-141 cause nausea in 40% of people?
PT-141 activates melanocortin receptors broadly in the brain, not just sexual arousal centers. Off-target activation in nausea-control areas is a known side effect.
Can women use PT-141, or is it only for men?
Women can use it. PT-141 is FDA-approved for female HSDD (hypoactive sexual desire disorder) at 1.75mg.
Is PT-141 safe if I have high blood pressure?
No. PT-141 raises blood pressure and causes flushing. The file lists uncontrolled hypertension as a contraindication.
