Drug Interaction Report

GENERALLY AVOID: Coadministration with potent and moderate inducers of CYP450 3A4 may significantly decrease the plasma concentrations of ulipristal acetate and its pharmacologically active metabolite. Based on in vitro and pharmacokinetic data, ulipristal acetate is thought to be primarily metabolized by CYP450 3A4 to mono-demethylated and di-demethylated metabolites. When a single 30 mg dose of ulipristal acetate was administered following a 9-day treatment with 600 mg once daily of rifampin, a potent CYP450 3A4 inducer, ulipristal acetate peak plasma concentration (Cmax) and systemic exposure (AUC) decreased by 90% and 93% respectively, while half-life decreased by 2.2-fold. The Cmax and AUC of monodemethyl-ulipristal acetate, the active metabolite, decreased by 84% and 90%, respectively. The interaction has not been studied with other, less potent inducers.

MANAGEMENT: Concomitant use of ulipristal acetate with potent and moderate CYP450 3A4 inducers should generally be avoided due to the potential for loss of therapeutic efficacy. For patients who have used enzyme-inducing drugs within the past 4 weeks and are seeking emergency contraception, ulipristal acetate is not recommended and a non-hormonal method (i.e. a copper intrauterine device (Cu-IUD)) should be considered.

Food does not appear to have a clinically significant effect on the oral bioavailability of sotorasib. When a 960 mg dose of sotorasib was administered to study patients with a high-fat, high-calorie meal (approximately 800 to 1000 calories; 150, 250, and 500 to 600 calories from protein, carbohydrate, and fat, respectively), sotorasib peak plasma concentration (Cmax) did not change while systemic exposure (AUC 0-24 hours) increased by 25% compared to administration under fasted conditions. Sotorasib can be administered with or without food at approximately the same time each day.