Source comparison
PT-141 Animal vs Human Research: Clinical Endpoint Comparison
Rats (male) Intracerebroventricular 5–15 minutes 60–90 minutes Spontaneous erections, mounting frequency High mechanistic accuracy; timeline mismatch Rats (female) Intranasal 10–20 minutes 90–120 minutes Lordosis behavior, receptivity Behavioral proxy imprecis
This comparison does not assign a generated winner or score.
- Rats (male)
- Intracerebroventricular
- 5–15 minutes
- 60–90 minutes
- Spontaneous erections, mounting frequency
- High mechanistic accuracy; timeline mismatch
- Rats (female)
- Intranasal
- 10–20 minutes
- 90–120 minutes
- Lordosis behavior, receptivity
- Behavioral proxy imprecise; mechanism valid
- Mice (knockout models)
- Subcutaneous
- 15–30 minutes
- 60 minutes
- Receptor-specific effects via MC4R knockouts
- Excellent for pathway validation
- Humans (premenopausal women)
- 45 minutes–8 hours
- Variable (self-reported)
- Female Sexual Function Index (FSFI) scores
- Side effect profile diverged significantly
- Humans (men with ED)
- 30–60 minutes
- 2–6 hours (reported)
- International Index of Erectile Function (IIEF)
- Early trials discontinued due to hypertension
- Bottom Line / Professional Assessment
- Melanocortin receptor mechanism translated cleanly across species, but pharmacokinetics. Absorption rate, blood-brain barrier transport, and side effect thresholds. Required complete protocol redesign for human viability. Animal models correctly identified the biological pathway but could not predict human-appropriate dosing or delivery.