Systemic Concentration (mg)
Calculated Retatrutide clearance over 84 days
Analytical Result
ConfirmedBased on the titration protocol for Retatrutide, the simulation indicates a robust pharmacodynamic curve. Peak systemic concentration of 14.14mg is attained after consistent dosing through day 27. Bio-accumulation factor of 7.1x remains within standard clinical parameters.
Based on published pharmacokinetic data. Individual results vary. For research purposes only.
Understanding Drug Accumulation
01Why Accumulation Matters
GLP-1 agonists like Retatrutide, Tirzepatide, and Semaglutide are dosed weekly — but their half-lives range from 5 to 7 days. Each new dose is injected while there's still significant residual drug from previous doses.
Drug levels accumulate week over week until reaching a steady state — where the amount eliminated between doses equals the amount injected. This typically takes 4–5 weeks at each dose level.
02What This Means for Titration
If you inject 2mg of Retatrutide on week 1 and don't feel much, you might jump to 4mg the next week. But there's still ~1.2–1.5mg from your first dose circulating. Your effective dose is closer to 5–5.5mg — not 4mg. This is why slow titration (increasing every 4 weeks) is essential.
03Half-Life Data by Compound
| Drug | Half-Life | Steady State | Dosing |
|---|---|---|---|
| Retatrutide | ~144h (6 days) | ~4–5 weeks | Once weekly |
| Tirzepatide | ~120h (5 days) | ~3–4 weeks | Once weekly |
| Semaglutide | ~168h (7 days) | ~4–5 weeks | Once weekly |
Based on published pharmacokinetic data. For research and educational purposes only.
