Patent ID: 8133893

Claim:
Trazodone or trazodone hydrochloride, wherein alkylating substances are present in a total amount which is less than 15 ppm and said alkylating substances are selected from the group consisting of 2,2-dichloroethylamine, 1-bromo-3-chloro-propane, N-(3-chlorophenyl)-N′-(3-chloropropyl)-piperazine, 2-(3-chloropropyl)-s-triazolo-[4,3-a]-pyridin-3-one, 3-chloro-N,N′-dichloroethyl-aniline, 2-{3-[bis-(2-chloroethyl)-amino]-propyl}-2H-[1,2,4]-triazolo[4,3-a]pyridin-3-one, 2,2-dibromoethylamine, 1,3-dichloropropane and a mixture thereof.