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How to Use Peptides for Erectile Dysfunction: Protocol Comparison
| Protocol Element | PT-141 (Bremelanotide) | Sildenafil (Viagra) | Professional Assessment ||—|—|—|| Mechanism of Action | Melanocortin receptor (MC3R/MC4R) agonist in CNS. Activates hypothalamic arousal pathways | PDE5 inhibitor. Increases cGMP in penile smo
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- | Protocol Element | PT-141 (Bremelanotide) | Sildenafil (Viagra) | Professional Assessment ||—|—|—|| Mechanism of Action | Melanocortin receptor (MC3R/MC4R) agonist in CNS. Activates hypothalamic arousal pathways | PDE5 inhibitor. Increases cGMP in penile smooth muscle, causing vasodilation | PT-141 addresses libido and central arousal; sildenafil addresses vascular insufficiency. Non-overlapping mechanisms mean different patient profiles benefit. || Onset Time | 60–90 minutes to peak effect | 30–60 minutes to peak effect | PT-141 requires earlier administration than PDE5 inhibitors. Timing expectations must shift. || Duration of Efficacy | 4–6 hours therapeutic window | 4–6 hours therapeutic window | Similar effective duration, but PT-141's onset delay narrows the usable window for spontaneous activity. || Administration Route | Subcutaneous injection (abdomen, thigh, or deltoid) | Oral tablet | Injection requirement limits convenience but bypasses first-pass hepatic metabolism, impr