AUC: ~↓ 40% Cmax: ~↓ 40% Cmin: ~↓ 40% (CYP3A4 induction, the effect of efavirenz is compensated by the pharmacokinetic booster effect of ritonavir) For co-administration of efavirenz with low-dose ritonavir in combination with a protease inhibitor, see section on ritonavir below.