Drug interactions
Buspirone + Methylthioninium chloride
Severity: Major
Buspirone and Methylthioninium chloride: major interaction.
Last updated
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 inhibits MAO-A and buspirone has serotonergic 5-HT1A activity, which raises the risk of serotonin syndrome. Serious cases are described with methylene blue and serotonergic agents.
What this interaction means in plain words
Buspirone and Methylthioninium chloride 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.
Buspirone belongs to Central Nervous System; Methylthioninium chloride belongs to Miscellaneous.
Why it happens
MAO-A inhibition by methylene blue combined with serotonergic agonism by buspirone.
What to do
Avoid combination; if methylene blue is required, hold buspirone and monitor for serotonin syndrome for several days.
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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Other interactions of Methylthioninium chloride
Other interactions of Buspirone
- Buspirone + Isocarboxazid Contraindicated
- Buspirone + Linezolid Contraindicated
- Buspirone + Phenelzine Contraindicated
- Buspirone + Procarbazine Contraindicated
- Buspirone + Selegiline Contraindicated
- Buspirone + Selegiline transdermal Contraindicated
Frequently asked questions
Can I take Buspirone with Methylthioninium chloride?
MediHelp rates the interaction as major. Buspirone and Methylthioninium chloride 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 inhibits MAO-A and buspirone has serotonergic 5-HT1A activity, which raises the risk of serotonin syndrome. Serious cases are described with methylene blue and serotonergic agents.
How serious is the interaction between Buspirone and Methylthioninium chloride?
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 combination; if methylene blue is required, hold buspirone and monitor for serotonin syndrome for several days.
What other medicines interact with Methylthioninium chloride?
MediHelp also lists interactions of Methylthioninium chloride with, for example, Levomilnacipran, Linezolid, Bupropion. The full list is on the Methylthioninium chloride page.
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