PT-141 Tracker

PT-141 is a melanocortin receptor agonist that acts centrally rather than on the vascular system. This page covers its half-life, what that timescale means for keeping a usable record, and how it changes the shape of a log — not what to take or how much.

What PT-141's timing means for tracking

PT-141 has a half-life near 2.7 hours against an estimated activity window of about 12 — a roughly fourfold gap between how long the compound persists and how long its effects may.

That gap is the useful thing to understand. A record that assumes the effect ends when the compound clears would consistently under-describe the day. It is a milder version of the same divergence seen with TB-500, and the reason PepTrack models both figures rather than plotting decay alone.

Unlike most compounds here, PT-141 is typically used situationally rather than on a fixed recurring schedule. That makes the log look different: irregular by design, with the interval between entries carrying more meaning than any cadence would.

It is also worth noting that bremelanotide is an approved medicine in some markets under the name Vyleesi, which is not true of most compounds on this site.

What to capture in the log

• Record the clock time — with a ~2.7-hour half-life and situational use, time of day is the point.
• Do not expect a cadence. Irregular intervals are normal here and the gaps are the data.
• Note that the activity window outlasts the compound roughly fourfold.

Worked reconstitution example

Purely as arithmetic, using round numbers rather than a recommendation. If a 10 mg vial were mixed with 2 mL of bacteriostatic water, the concentration would be 5 mg/mL. Measuring 1 mg from that would come to:

Frequently asked questions