---
title: "Does phentermine cause constipation? What to do"
description: "Yes, phentermine can cause constipation in some people. See why it happens, what may help, and when to call a clinician for safer, with clinician guidance."
canonical: "https://www.vitalsvault.com/treatment-learn/does-phentermine-cause-constipation"
last-updated: 2026-08-22
---

# Does phentermine cause constipation? What to do

> Yes, phentermine can cause constipation in some people. See why it happens, what may help, and when to call a clinician for safer, with clinician guidance.

---

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