Half-lives / Anastrozole
Anastrozole half-life
≈ 46 h (46 hours) — computed decay curve below, primary source cited.
| Half-life | ≈ 46 h |
|---|---|
| ~97% cleared (5 half-lives) | ≈ 9.6 days |
| Typical route (published research) | Oral · as directed |
Source: FDA label: Arimidex (anastrozole) prescribing information
Frequently asked
How long does Anastrozole stay in your system?
With a half-life of ≈ 46 h, roughly 97% of a single Anastrozole dose is cleared after five half-lives — about 9.6 days. Repeated dosing accumulates and takes correspondingly longer to clear.
What does a ≈ 46 h half-life mean in practice?
Every 46 h, the remaining amount halves: 100% → 50% → 25% → 12.5%, and so on. The curve above plots exactly this decay for a single dose.
Where does this Anastrozole half-life number come from?
FDA label: Arimidex (anastrozole) prescribing information. We cite a primary source for every half-life we publish and version every change.
Related: Anastrozole reconstitution calculator · Anastrozole dose charts
See your own estimated levels
The Zyra Labs app plots this curve from the doses you actually log — accumulation, overlaps, and all — on your device, free to start.
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