[CAS NO. 133865-89-1]  Safinamide

Safinamide is absorbed quickly, with a bioavailability of 95%, and a demonstrated time to maximum plasma concentration of 1.8-2.8 hours. It exhibits extensive extravascular distribution with a volume of distribution of approximately 165 L. Safinamide does not undergo significant first-pass metabolism and is mediated by amidase enzymes producing safinamide acid and other metabolites. Safinamide is mediated by cytochrome P450 (CYP) 3A4 isoenzymes. It is 88% to 90% plasma protein-bound and is primarily eliminated through the kidneys (approximately 76%) in the form of its metabolites, with an elimination half-life of 20 to 30 hours. About 1.5% of safinamide is found excreted in the feces. Safinamide exhibits linear pharmacokinetics after oral administration of 50 mg to 300 mg (three times the maximum recommended daily dose) with a steady state reached within five to six days.