Source comparison
Melanotan-2 vs PDE5 Inhibitors vs Other Research Peptides: Mechanism Comparison
Melanotan-2 Central MC4R activation → oxytocin/NO release in hypothalamus and spinal autonomic nuclei 60–120 min (SC), 2–4 hrs (intranasal) 24–72 hours Psychogenic ED, central arousal deficits, low libido Best for research models where desire and motivation ar
This comparison does not assign a generated winner or score.
- Melanotan-2
- Central MC4R activation → oxytocin/NO release in hypothalamus and spinal autonomic nuclei
- 60–120 min (SC), 2–4 hrs (intranasal)
- 24–72 hours
- Psychogenic ED, central arousal deficits, low libido
- Best for research models where desire and motivation are impaired. Not mechanical erectile capacity
- Sildenafil (Viagra)
- Peripheral PDE5 inhibition → prolonged cGMP signalling in penile smooth muscle
- 30–60 min
- 4–6 hours
- Vascular ED, mechanical erectile dysfunction
- Works only when arousal signal is present; ineffective if central desire is the limiting factor
- PT-141 (Bremelanotide)
- Selective MC4R agonist (similar mechanism to MT-2 but without MC1R binding)
- 45–90 min
- 12–24 hours
- Female sexual dysfunction, hypoactive sexual desire disorder
- FDA-approved for female HSDD; avoids melanogenic effects but retains nausea side effect profile
- Kisspeptin
- Hypothalamic GnRH stimulation → downstream testosterone and estradiol modulation
- 30–60 min (IV)
- 2–4 hours (acute phase)
- Research models of hormonal sexual dysfunction
- Increases arousal in functional MRI studies but lacks robust ED trial data