OBJECTIVES:Neurokinin-1 receptor antagonists (NK1 RAs) are commonly coadministered with a 5-HT3 RA such as palonosetron to prevent nausea and vomiting induced by chemotherapy. Netupitant, a new highly selective NK1 RA, is both a substrate for and a moderate inhibitor of CYP3A4. Three studies were designed to evaluate the potential drug-drug interaction of netupitant with palonosetron and of the fixed dose combination of netupitant and palonosetron, NEPA, with an inhibitor (ketoconazole), an inducer (rifampicin) and a substrate (oral contraceptives) of CYP3A4. METHODS: Study 1 was a three-way crossover in 18 healthy subjects receiving netupitant alone, palonosetron alone, and the combination of both antiemetics. Studies 2 and 3 were two-way crossover trials where healthy subjects received NEPA (the fixed dose combination of netupitant and palonosetron). In study 2, 36 subjects receivedNEPA alone (day 1) and in combination with ketoconazole or rifampicin. In study 3, 24 healthy women receivedethinylestradiol/levonorgestrel alone or in combination with NEPA (day 1). RESULTS: There were no significant pharmacokinetic interactions between netupitant and palonosetron. Ketoconazole increased netupitant area under curve (AUC) by 140 % and C max by 25 %. Rifampicin decreased netupitant AUC by 83 % and C max by 62 %. NEPA did not significantly affect exposure to ethinylestradiol, while systemic exposure to levonorgestrel increased by 40 %, but this was not considered clinically relevant. CONCLUSIONS: There were no clinically relevant interactions between netupitant and palonosetron, or between NEPA and oral contraceptives. The coadministration of NEPA with inhibitors or inducers of CYP3A4 may require dose adjustments. Treatments were well tolerated.
RCT Entities:
OBJECTIVES: Neurokinin-1 receptor antagonists (NK1 RAs) are commonly coadministered with a 5-HT3 RA such as palonosetron to prevent nausea and vomiting induced by chemotherapy. Netupitant, a new highly selective NK1 RA, is both a substrate for and a moderate inhibitor of CYP3A4. Three studies were designed to evaluate the potential drug-drug interaction of netupitant with palonosetron and of the fixed dose combination of netupitant and palonosetron, NEPA, with an inhibitor (ketoconazole), an inducer (rifampicin) and a substrate (oral contraceptives) of CYP3A4. METHODS: Study 1 was a three-way crossover in 18 healthy subjects receiving netupitant alone, palonosetron alone, and the combination of both antiemetics. Studies 2 and 3 were two-way crossover trials where healthy subjects received NEPA (the fixed dose combination of netupitant and palonosetron). In study 2, 36 subjects received NEPA alone (day 1) and in combination with ketoconazole or rifampicin. In study 3, 24 healthy women received ethinylestradiol/levonorgestrel alone or in combination with NEPA (day 1). RESULTS: There were no significant pharmacokinetic interactions between netupitant and palonosetron. Ketoconazole increased netupitant area under curve (AUC) by 140 % and C max by 25 %. Rifampicin decreased netupitant AUC by 83 % and C max by 62 %. NEPA did not significantly affect exposure to ethinylestradiol, while systemic exposure to levonorgestrel increased by 40 %, but this was not considered clinically relevant. CONCLUSIONS: There were no clinically relevant interactions between netupitant and palonosetron, or between NEPA and oral contraceptives. The coadministration of NEPA with inhibitors or inducers of CYP3A4 may require dose adjustments. Treatments were well tolerated.
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