---
title: "Methylene blue side effects: common and serious"
description: Methylene blue side effects range from urine discoloration and nausea to rare serious reactions like serotonin syndrome and hemolysis in G6PD deficiency.
canonical: "https://www.vitalsvault.com/treatment-learn/methylene-blue-side-effects"
last-updated: 2026-08-22
---

# Methylene blue side effects: common and serious

> Methylene blue side effects range from urine discoloration and nausea to rare serious reactions like serotonin syndrome and hemolysis in G6PD deficiency.

---

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