---
title: "Phentermine side effects: common and serious risks"
description: "Phentermine side effects may include dry mouth, insomnia, constipation, and jitteriness. Know serious warning signs like chest pain or shortness of breath."
canonical: "https://www.vitalsvault.com/treatment-learn/effects-of-phentermine"
last-updated: 2026-08-22
---

# Phentermine side effects: common and serious risks

> Phentermine side effects may include dry mouth, insomnia, constipation, and jitteriness. Know serious warning signs like chest pain or shortness of breath.

---

Canonical HTML: https://www.vitalsvault.com/treatment-learn/effects-of-phentermine
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