No Interaction Expected
Emtricitabine/Tenofovir-DF (FTC/TDF, PrEP)
Quality of Evidence:
Coadministration has not been studied but based on metabolism and clearance a clinically significant interaction is unlikely. Cetirizine is only metabolised to a limited extent and is eliminated unchanged in the urine through both glomerular filtration and tubular secretion. In vitro data indicate that cetirizine inhibits OCT2 but this is not involved in the renal elimination of emtricitabine or tenofovir.
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