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Potential Interaction

Darunavir + ritonavir (DRV/r)

Solifenacin

Quality of Evidence: Very Low

Summary:

Coadministration has not been studied. Solifenacin is metabolized by CYP3A4 and concentrations are likely to increase due to inhibition of CYP3A4. A 3-fold increase in solifenacin exposure was observed with ketoconazole (a strong inhibitor of CYP3A4). It is recommended that solifenacin dosage should be limited to 5 mg once daily if coadministered with a strong CYP3A4 inhibitor such as ritonavir.

Description:

Coadministration has not been studied. Use with caution. Monitor for solifenacin adverse reactions, dose reduction of solifenacin may be necessary.
Prezista Summary of Product Characteristics, Janssen-Cilag Ltd, September 2022.

Coadministration with darunavir/ritonavir may increase solifenacin concentrations. When solifenacin is co-administered with darunavir/ritonavir, do not exceed a solifenacin dose of 5 mg once daily.
Prezista Prescribing Information, Janssen Pharmaceuticals Inc, March 2023.

View all available interactions with Darunavir + ritonavir (DRV/r) by clicking here.

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