Methylene Blue Interaction Checker: Search Any Medication

For the full research-backed breakdown of why these interactions exist, see methylene blue drug interactions: the complete guide.

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Understanding the Risk Tiers

Avoid — documented high risk

This tier covers medications with a documented, mechanistic serotonin syndrome risk when combined with methylene blue. The common thread: these drugs increase serotonin availability (by blocking reuptake or inhibiting breakdown), and methylene blue inhibits MAO-A — the enzyme that breaks down serotonin. The combination creates excess serotonin activity. SSRIs, SNRIs, MAOIs, and the antibiotic linezolid all fall here. The FDA issued a formal safety communication on this in 2011.

Caution — moderate or less-characterized risk

These medications have serotonergic activity but the interaction risk is less clearly characterized than with SSRIs and MAOIs, or the mechanism is indirect. Tricyclic antidepressants, tramadol, dextromethorphan (in common OTC cough medications), buspirone, and serotonin-precursor supplements (5-HTP, L-tryptophan) fall here. Caution does not mean safe — it means "discuss this specifically with your doctor."

Discuss with your doctor — no documented serotonin risk

These medications have no documented serotonergic interaction with methylene blue, but the combination still warrants a conversation with your prescribing physician — particularly because methylene blue has vasopressor properties (relevant for blood pressure medications) and redox activity (relevant in some clinical contexts). This tier includes blood pressure medications, anticoagulants, statins, and most psychiatric medications without direct serotonin mechanisms.

No documented interaction

Common medications and supplements with no documented interaction with methylene blue in the available literature. This does not mean the combination is risk-free in all circumstances — it means no specific concern has been documented. Always tell your healthcare provider about everything you are taking.

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The G6PD Deficiency Exception

This checker focuses on drug-drug interactions. There is a separate, important consideration that applies regardless of your medications: G6PD (glucose-6-phosphate dehydrogenase) deficiency.

In G6PD-deficient individuals, methylene blue can cause hemolytic anemia — the breakdown of red blood cells. G6PD deficiency is more common in individuals of African, Mediterranean, Middle Eastern, and South/Southeast Asian descent, and many people are unaware they have it. G6PD testing is done by a simple blood test. See the full discussion in our interactions guide.

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Not sure if methylene blue is right for you? Use the 5-question safety screener — it takes 60 seconds.

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