A Antispasmodic (Atropine/Hyoscyamine/Pb/Scopolamine) by adhealth32 September 5, 2010 What is Antispasmodic (Atropine/Hyoscyamine/Pb/Scopolamine)? Phenobarbital is in a group of drugs called barbiturates (bar-BIT-chur-ates). Phenobarbital…