Drug interactions
Carbidopa-entacapone-levodopa + Methylene blue
Severity: Major
Carbidopa-entacapone-levodopa and Methylene blue: 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 monoamine oxidase A and can precipitate serotonin syndrome with serotonergic drugs. Levodopa raises monoamine levels, and with nonselective MAO inhibition there is also risk of hypertensive reactions.
What this interaction means in plain words
Carbidopa-entacapone-levodopa and Methylene blue 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
MAO-A inhibition by methylene blue combined with increased monoamine availability from levodopa.
What to do
Avoid the combination where possible. If methylene blue is urgently needed, stop the interacting drug and monitor for serotonin toxicity and blood pressure changes.
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 Carbidopa-entacapone-levodopa
- Carbidopa-entacapone-levodopa + Isocarboxazid Contraindicated
- Carbidopa-entacapone-levodopa + Phenelzine Contraindicated
- Carbidopa-entacapone-levodopa + Selegiline transdermal Contraindicated
- Carbidopa-entacapone-levodopa + Tranylcypromine Contraindicated
- Amisulpride + Carbidopa-entacapone-levodopa Major
- Asenapine transdermal + Carbidopa-entacapone-levodopa Major
Frequently asked questions
Can I take Carbidopa-entacapone-levodopa with Methylene blue?
MediHelp rates the interaction as major. Carbidopa-entacapone-levodopa and Methylene blue 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 monoamine oxidase A and can precipitate serotonin syndrome with serotonergic drugs. Levodopa raises monoamine levels, and with nonselective MAO inhibition there is also risk of hypertensive reactions.
How serious is the interaction between Carbidopa-entacapone-levodopa and Methylene blue?
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 the combination where possible. If methylene blue is urgently needed, stop the interacting drug and monitor for serotonin toxicity and blood pressure changes.
What other medicines interact with Carbidopa-entacapone-levodopa?
MediHelp also lists interactions of Carbidopa-entacapone-levodopa with, for example, Isocarboxazid, Phenelzine, Selegiline transdermal. The full list is on the Carbidopa-entacapone-levodopa page.
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