Drug interactions
Methylene blue + Safinamide
Severity: Major
Methylene blue and Safinamide: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Methylene blue is a potent reversible MAO-A inhibitor and has caused serotonin syndrome with serotonergic drugs. Safinamide, an MAO-B inhibitor, adds to the risk, though MAO-B selectivity limits it somewhat.
What this interaction means in plain words
Methylene blue and Safinamide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Methylene blue MAO-A inhibition combined with serotonergic activity of safinamide increases synaptic serotonin.
What to do
Avoid intravenous methylene blue where possible. If it is urgent, stop safinamide and monitor for serotonin syndrome for up to 2 weeks or 24 hours after the last methylene blue dose.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Safinamide
- Amitriptyline + Safinamide Contraindicated
- Amoxapine + Safinamide Contraindicated
- Amphetamine polistirex + Safinamide Contraindicated
- Clomipramine + Safinamide Contraindicated
- Cyclobenzaprine + Safinamide Contraindicated
- Desipramine + Safinamide Contraindicated
Frequently asked questions
Can I take Methylene blue with Safinamide?
MediHelp rates the interaction as major. Methylene blue and Safinamide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Methylene blue is a potent reversible MAO-A inhibitor and has caused serotonin syndrome with serotonergic drugs. Safinamide, an MAO-B inhibitor, adds to the risk, though MAO-B selectivity limits it somewhat.
How serious is the interaction between Methylene blue and Safinamide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid intravenous methylene blue where possible. If it is urgent, stop safinamide and monitor for serotonin syndrome for up to 2 weeks or 24 hours after the last methylene blue dose.
What other medicines interact with Safinamide?
MediHelp also lists interactions of Safinamide with, for example, Amitriptyline, Amoxapine, Amphetamine polistirex. The full list is on the Safinamide page.
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