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Should I use PT-141 as an injection or nasal spray?

Updated 2026-05-05

PT-141 (bremelanotide) is sold under the brand Vyleesi as a 1.75 mg subcutaneous autoinjector for women with low sexual desire. Compounded versions come as both injections and nasal sprays. Injections give a more predictable onset (about 45 minutes) and longer effect window (6-12 hours) but more nausea. Nasal sprays kick in faster (20-60 minutes) and wear off faster (up to 4 hours), which some people prefer for spontaneity. There is no head-to-head trial; pick based on whether you want predictability or convenience.

IfIf you want the most predictable, longest-lasting effect
Thenthen use the subcutaneous injection at 1.75 mg about 45 minutes before activity
IfIf needles are a deal-breaker or you want more spontaneity
Thenthen a compounded nasal spray is reasonable, knowing dosing is less precise
IfIf you tend to get nauseous from medications
Thenthen start with the lowest available dose (often 1 mg compounded) and titrate up
IfIf you have high blood pressure or take BP medication
Thenthen talk to a doctor first - PT-141 raises BP transiently in both forms
Key facts
  • Vyleesi (the approved-in-the-US version) is injection-only at 1.75 mg per dose
  • Compounded nasal sprays typically run 1-10 mg/mL; common starting dose is 1-2 sprays per nostril
  • Injection onset ~45 min, duration 6-12 hours; nasal onset 20-60 min, duration up to 4 hours
  • Nasal absorption bypasses first-pass metabolism but is more variable person to person
  • Both forms work on the same melanocortin pathway in the brain - the difference is delivery, not mechanism
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