Melanotan I vs PT-141
FDA Approved vs FDA Approved
monitor Mechanism-based · 55% Both Melanotan I and PT-141 activate melanocortin receptors. Additive effects may increase nausea, flushing, and appetite suppression. Use lower doses of each if combining.
Molecular Data
Melanotan I PT-141
Weight 1646.88 Da —
Half-life ~30 minutes ~2.7 hours
Type Synthetic peptide analog Melanocortin receptor agonist
Key Benefits
Melanotan I
01 Precise dosing control with rapid tanning onset
02 Flexible home administration unlike implant version
03 Visible tanning within 1-2 weeks with UV exposure
04 Enhanced photoprotection through increased melanin
05 More selective for MC1R than Melanotan II
PT-141
01 FDA-approved pharmaceutical route
02 Predictable absorption profile
03 Effective for both male and female sexual dysfunction
04 Works within 45 minutes
05 Effective in PDE5 inhibitor-resistant cases
06 Central mechanism (not dependent on blood flow)
Dosing Protocols
Melanotan I
Loading: 0.25-0.5mg daily; Maintenance: 0.25-0.5mg 2-3x weekly / Loading phase: 1-2x daily for 1-2 weeks, then maintenance 2-3x weekly
Loading phase 0.25-0.5mg 1-2x daily for 1-2 weeks
Maintenance 0.25-0.5mg 2-3x weekly
PT-141
Women: 1.75mg (FDA-approved); Men: 1-2mg; Start 0.5mg test dose for tolerance / As needed before sexual activity; max 1 dose per 24 hours
Female HSDD (FDA-approved) 1.75mg As needed, max 1 dose/24hr
Male Erectile Dysfunction 1-2mg As needed, 45-60min before activity
Female Arousal Disorder 0.75-1.25mg As needed, max 1 dose/24hr
Low Starting Dose 0.5mg Test dose for tolerance assessment
Side Effects
Melanotan I
Mild nausea
Facial flushing
Reduced appetite
Increased mole/freckle pigmentation
PT-141
Nausea (40%)
Flushing (20%)
Headache (11%)
Injection site reactions
Contraindications
Uncontrolled hypertension
Cardiovascular disease
Use of nitrate medications
Pregnancy or breastfeeding
Research Evidence
Melanotan I PT-141
Status FDA Approved FDA Approved
References 3 studies 4 studies
Latest — 2022
FDA Approved Yes Yes
This comparison is for educational and research purposes only. Consult a healthcare professional before use.