Clonazepam and Itraconazole interaction
Clonazepam and Itraconazole: both prescribing labels flag 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 Itraconazole (Tolsura) label · effective 2025-04-23
Anticonvulsants Carbamazepine Not recommended 2 weeks before, during, and 2 weeks after TOLSURA treatment.
Anticonvulsants Phenobarbital Phenytoin Not recommended 2 weeks before and during TOLSURA treatment.
From the Clonazepam (Klonopin) label · effective 2025-12-01
Although clinical studies have not been performed, based on the involvement of the cytochrome P-450 3A family in clonazepam metabolism, inhibitors of this enzyme system, notably oral antifungal agents (e.g., fluconazole), should be used cautiously in patients receiving clonazepam because they may impair the metabolism of clonazepam leading to exaggerated concentrations…
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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.