Metabolites M1, M2 and M3 were shown to bind to the substance P/neurokinin 1 (NK1) receptor. Mean Cmax was approximately 11%, 47% and 16% of netupitant for metabolites M1, M2 and M3, respectively. Mean AUC for metabolites M1, M2 and M3 was 29%, 14% and 33% of netupitant, respectively. The median tmax for metabolite M2 was 5 hours and was about 17-32 hours for metabolites M1 and M3.