Washout timer
The mirror of the accumulation plotter: how long after a last dose until five half-lives have passed and about 3% remains. Seed the half-life from a compound’s entry or type one.
Inputs
Cleared · 5 half-lives, 3.1% left
20 hafter the last dose
Enter a last-dose time for a date.
| Half-lives | Remaining | Elapsed | When |
|---|---|---|---|
| 1 | 50% | 4 h | — |
| 2 | 25% | 8 h | — |
| 3 | 12.5% | 12 h | — |
| 4 | 6.3% | 16 h | — |
| 5 | 3.1% | 20 h | — |
Model
remaining = 0.5 ^ (t / t½)t(to fraction f) = t½ × log₂(1 / f)
cleared ≈ 5 × t½ (1/32 left)
First-order elimination of the parent compound, nothing more: no active metabolites, no depot, no tissue binding. Half-lives are the values recorded in each entry’s references, many from a single study. For research use only; nothing here is a schedule.