Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| PT-141 (Bremelanotide) | Semax | |
|---|---|---|
| Category | Peptides | Peptides |
| Standard Dose | Research indicates 1.75 mg administered via subcutaneous injection approximately 45 minutes before anticipated sexual activity. | Research indicates 200-600 mcg daily via intranasal administration (0.1% solution, 2-3 drops per nostril). |
| Timing | 45-60 minutes before anticipated sexual activity. Effects last 6-72 hours depending on individual response. | Morning and early afternoon dosing (avoid evening — may cause stimulation/insomnia). Intranasal preferred for rapid CNS delivery. |
| Cycle Duration | As-needed basis. Not intended for daily use. | 10-14 day cycles with equal rest periods. Some protocols use 3-5 day on / 2 day off patterns. |
| Evidence Level | strong_human | moderate_human |
PT-141 (Bremelanotide) is a synthetic cyclic heptapeptide melanocortin analog that acts as an agonist at MC3R and MC4R melanocortin receptors, with higher affinity for MC4R. It enhances sexual desire by activating presynaptic MC4Rs on neurons in the medial preoptic area (mPOA) of the hypothalamus, increasing dopamine release — an excitatory neurotransmitter for sexual desire. Unlike PDE5 inhibitors, PT-141 works centrally through the CNS rather than peripherally on blood flow, addressing desire rather than just erectile mechanics.
Research indicates 1.75 mg administered via subcutaneous injection approximately 45 minutes before anticipated sexual activity.
45-60 minutes before anticipated sexual activity. Effects last 6-72 hours depending on individual response.
As-needed basis. Not intended for daily use.
Semax (Met-Glu-His-Phe-Pro-Gly-Pro) is a synthetic heptapeptide analog of the ACTH(4-10) fragment that rapidly upregulates brain-derived neurotrophic factor (BDNF) and its signaling receptor TrkB in the hippocampus (1.4-fold BDNF protein increase, 3-fold exon III BDNF mRNA increase). It activates dopaminergic and serotonergic brain systems, enhances neurotrophin gene expression (BDNF, NGF), and modulates intracellular calcium dynamics in brain neurons. Semax lacks ACTH's corticotropic activity, acting purely as a nootropic/neuroprotective agent.
Research indicates 200-600 mcg daily via intranasal administration (0.1% solution, 2-3 drops per nostril).
Morning and early afternoon dosing (avoid evening — may cause stimulation/insomnia). Intranasal preferred for rapid CNS delivery.
10-14 day cycles with equal rest periods. Some protocols use 3-5 day on / 2 day off patterns.
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