Increased AUC & C
max w/ diltiazem, erythromycin, ciprofloxacin & cyclosporine. Decreased AUC & C
max w/ efavirenz. Decreased C
max w/ famotidine. Caution in simultaneous administration of 50 mg Quviviq w/ sensitive CYP3A4 substrates w/ narrow therapeutic index (eg, high-dose simvastatin, tacrolimus) & P-gp substrates w/ narrow therapeutic index (eg, digoxin). Prolonged absorption w/ alcohol.