Interaksi Rifabutin dan Ritonavir

Therefore, co-administration with antiretroviral and anti-HCV drugs metabolized by CYP3A is not recommended or there may be a need to increase the dose of antiretroviral or anti-HCV drugs (see PRECAUTIONS-Drug Interactions ).

Fosamprenavir/ritonavir 700 mg twice a day plus ritonavir 100 mg twice a day for 2 weeks 150 mg every other day for 2 weeks Healthy subjects (15) ↔ AUC compared to rifabutin 300 mg once a day alone ↓ C max by 15% ↑ AUC by 35% compared to historical control (fosamprenavir/ritonavir 700/100 mg twice a day) , ↑ C max by 36%, ↑ C min by 36% Reduce rifabutin dose…

Lopinavir/ ritonavir 400/100 mg twice a day for 20 days 150 mg once a day for 10 days Healthy subjects (14) ↑ AUC by 203% also taking zidovudine 500 mg once a day ↓ C max by 112% ↔ Reduce rifabutin dose by at least 75% (to a maximum 150 mg every other day or three times per week) when given with lopinavir/ritonavir combination.

Saquinavir/ritonavir 1000/100 mg twice a day for 14 or 22 days 150 mg every 3 days for 14 or 22 days Healthy subjects ↑ AUC by 53% compared to rifabutin 150 mg once a day alone ↑ C max by 88% (n=11) ↓ AUC by 13%, ↓ C max by 15%, (n=19) Reduce rifabutin dose by at least 75% (to a maximum 150 mg every other day or three times per week) when given with saquinavir/ritonavir…

Ritonavir 500 mg twice a day for 10 days 150 mg once a day for 16 days Healthy subjects (5) ↑ AUC by 300%, ↑ C max by 150% ND Reduce rifabutin dose by at least 75% (to a maximum 150 mg every other day or three times per week) when given with lopinavir/ritonavir combination.

Antimycobacterial: rifabutin ↑ rifabutin and rifabutin metabolite Dosage reduction of rifabutin by at least three-quarters of the usual dose of 300 mg per day is recommended (e.g., 150 mg every other day or three times a week).

Alternate antimycobacterial agents such as rifabutin should be considered.