Procarbazine Hydrochloride is an alkylating agent, with anticancer activity. In Vitro: Procarbazine Hydrochloride is an anticancer agent. Procarbazine is not cytotoxic to the LI 210 cells which lack cytochrome P-450 or monoamine oxidase activity^[1]. In Vivo: Procarbazine Hydrochloride (50 mg/kg, i.p.) causes micronuclei in hematopoietic cells, but does not increase the lacZ mutant frequency (MF) in bone marrow of mice, similar to that in liver, testis, spleen, kidney, and lung. Procarbazine Hydrochloride (50 mg/kg, i.p.) has positive effect on lung, bone marrow, and spleen for carcinogenesis^[2]. Procarbazine (450 mg/kg) significantly decreases testicular and epididymal weight and drastically reduces haploid cells and spermatogenic arrest in hamster^[3].