No Interaction Expected
Emtricitabine/Tenofovir-DF (FTC/TDF, PrEP)
Quality of Evidence:
Coadministration with emtricitabine/tenofovir-DF has not been studied. Based on metabolism and elimination a clinically significant interaction with emtricitabine is unlikely. No clinically significant pharmacokinetic interaction was observed between tenofovir-DF and dolutegravir. Coadministration of tenofovir-DF (300 mg once daily) and dolutegravir (50 mg once daily) decreased dolutegravir Cmax and Ctrough by 3% and 8%, and increased AUC by 1%. Tenofovir Cmax, AUC and Ctrough increased by 9%, 12% and 19%, respectively. Coadministration with emtricitabine has not been studied but based on metabolism and elimination no clinically significant interaction is likely. No dosage adjustment is necessary.
Coadministration of dolutegravir (50 mg once daily) and tenofovir-DF (300 mg once daily) was studied in 15 HIV-negative subjects. The pharmacokinetic parameters of tenofovir and dolutegravir when coadministered were comparable to those when given alone, demonstrating no significant drug interaction. Dolutegravir AUC increased by 1%, but Cmax and Ctrough decreased by 3% and 8%, respectively. Tenofovir AUC, Cmax and Ctrough increased by 12%, 9% and 19%, respectively.
Lack of interaction between the HIV integrase inhibitor S/GSK1349572 and tenofovir in healthy subjects. Song I, Min SS, Borland J, et al. J AIDS, 2010, 55(3): 365-367.
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