Itraconazole and Solifenacin interaction
Itraconazole and Solifenacin: 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
Co-administration with colchicine, fesoterodine and solifenacin is contraindicated in subjects with varying degrees of renal or hepatic impairment.
…both the pharmacologic effects and/or adverse reactions to these drugs [see Contraindications (4.1) and Drug Interactions (7.1) ] Co-administration with colchicine, fesoterodine and solifenacin is contraindicated in subjects with varying degrees of renal or hepatic impairment, and Co-administration with eliglustat is contraindicated in subjects that are poor or…
Concomitant drug dose reduction may be necessary Solifenacin Patients with severe renal or moderate to severe hepatic impairment : Contraindicated during and 2 weeks after TOLSURA treatment.
From the Solifenacin (Solifenacin succinate) label · effective 2026-07-06
The dosage of Solifenacin succinate tablets greater than 5 mg once daily is not recommended when concomitantly used with strong CYP3A4 inhibitors [see Dosage and Administration ( 2.4 )] .
CYP3A4 Inhibitors : Do not exceed the 5 mg dose of Solifenacin succinate tablets with concomitant use of strong CYP3A4 inhibitors.
Concomitant use of ketoconazole, a strong CYP3A4 inhibitor, significantly increased the exposure of solifenacin [see Clinical Pharmacology ( 12.3 )] .
Strong CYP3A4 Inhibitors Solifenacin is a substrate of CYP3A4.
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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.