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At 24 hours the plasma levels of sildenafil have been even now about 200 ng/mL, when compared with around 5 ng/mL when sildenafil was dosed by yourself. This is certainly per ritonavir's marked outcomes on the broad range of P450 substrates. VIAGRA experienced no impact on ritonavir pharmacokinetics [see DOSAGE AND ADMINISTRATION and DRUG INTERACTI