Carbidopa, levodopa, and entacapone and Methylene blue interaction
Carbidopa, levodopa, and entacapone and Methylene blue: the Carbidopa, levodopa, and entacapone prescribing label flags this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Carbidopa, levodopa, and entacapone (Carbidopa, Levodopa and Entacapone) label · effective 2026-04-08
Carbidopa, levodopa and entacapone tablets is contraindicated in patients: Taking nonselective monoamine oxidase (MAO) inhibitors (e.g., phenelzine and tranylcypromine).
These nonselective MAO inhibitors must be discontinued at least two weeks prior to initiating therapy with Carbidopa, levodopa and entacapone tablets.
• Concomitant use of nonselective monoamine oxidase (MAO) inhibitors ( 4 )
Therefore, the use of Carbidopa, levodopa and entacapone tablets is contraindicated in patients receiving nonselective MAO inhibitors [see Contraindications ( 4 )].
MAO Inhibitors Patients receiving nonselective MAO inhibitors and carbidopa, levodopa and entacapone may be at risk of increased adrenergic tone.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.