PT-141 (Bremelanotide) vs Sermorelin

A detailed comparison to help you understand the differences and choose the right peptide for your research goals.

PT-141 (Bremelanotide)

PT-141, also known as Bremelanotide, is a synthetic peptide analog of alpha-melanocyte-stimulating hormone. It is the only FDA-approved treatment for hypoactive sexual desire disorder (HSDD) in premenopausal women.

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Sermorelin

Sermorelin is a synthetic analog of GHRH consisting of the first 29 amino acids of the natural hormone. It was previously FDA-approved for GH deficiency diagnosis and treatment in children.

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Side-by-Side Comparison

Aspect	PT-141 (Bremelanotide)	Sermorelin
Dose Range	1.8 mg	100 mcg–300 mcg
Frequency	Less than daily	1x daily
Cycle Length	4–12 weeks	8–12 weeks
Route	subcutaneous	subcutaneous
Mechanism	PT-141 activates melanocortin receptors (MC3R and MC4R) in the central nervous system, particularly in areas associated with sexual arousal. Unlike PDE5 inhibitors, it works through the nervous system rather than the vascular system.	Binds to GHRH receptors in the pituitary gland to stimulate natural GH production and release. Maintains the body's natural feedback mechanisms for GH regulation.
Typical Dosage	FDA-approved dose: 1.75mg administered subcutaneously at least 45 minutes before anticipated sexual activity. Not to be used more than once within 24 hours or more than 8 times per month.	Typical dosing: 200-500mcg administered once daily, usually before bed. Some protocols use twice daily dosing.
Administration	Subcutaneous injection in the abdomen. Available as Vyleesi (commercial product). Research use may involve different dosing protocols.	Subcutaneous injection, preferably at bedtime to work with natural GH release patterns. Can be combined with GHRPs for synergistic effects.
Side Effects	Common side effects include nausea (40% of users), flushing, headache, and injection site reactions. Transient blood pressure increases may occur.	Generally well-tolerated. May cause injection site reactions, headache, flushing, or dizziness. Less side effects than direct GH administration.
Best For	Recovery & Healing	Muscle Growth Fat Loss Recovery & Healing Sleep Quality