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At 24 several hours the plasma levels of sildenafil have been nonetheless approximately two hundred ng/mL, compared to about 5 ng/mL when sildenafil was dosed alone. This is in keeping with ritonavir's marked results on a wide array of P450 substrates. VIAGRA had no effect on ritonavir pharmacokinetics [see DOSAGE AND ADMINISTRATION and DRUG INTERA

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