---
title: "How long does phentermine stay in your system?"
description: "Phentermine can remain detectable for days after your last dose. Here is what its half-life means, what changes it, and when to, with clinician guidance."
canonical: "https://www.vitalsvault.com/treatment-learn/how-long-does-phentermine-stay-in-your-system"
last-updated: 2026-08-22
---

# How long does phentermine stay in your system?

> Phentermine can remain detectable for days after your last dose. Here is what its half-life means, what changes it, and when to, with clinician guidance.

---

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