No, Donnatal is not a narcotic. It contains belladonna alkaloids and phenobarbital. Phenobarbital is in a group of drugs called barbiturates (bar-BIT-chur-ates). Phenobarbital slows the activity of your brain and nervous system. Belladonna alkaloids produce many effects in the body, including reduced muscle spasms in the digestive or urinary tract, an reduced fluid secretions from certain glands or organs. The belladonna alkaloids included in this medication include atropine, hyoscyamine, and scopolamine. The combination of belladonna alkaloids and phenobarbital is used to treat irritable bowel syndrome, ulcers in the intestine.