Safety Statements: Poison by ingestion, subcutaneous, intrauterine, intravenous, and intraperitoneal routes. Human reproductive effects by intrauterine and intracervical routes: changes in fertility and unspecified effects on the uterus, cervix and vagina. Experimental reproductive effects. Mutation data reported. Used as a treatment for parasitic worms. When heated to decomposition it emits very toxic fumes of Cl− and NOx.