200 q12h 400 q12h ↓ 82% ↓ 66% 200 q12h 100 q12h ↓ 39% ↓ 24% Concomitant use of ritonavir dosed as an antiretroviral agent and voriconazole is contraindicated due to reduction in voriconazole concentrations (see section 4.3).