Scientific evidence to recommend the use of "A. belladonna" in its natural form for any condition is insufficient, although some of its components, in particular "l"-atropine, which was purified from belladonna in the 1830s, have accepted medical uses. Donnatal is a prescription pharmaceutical, that combines natural belladonna alkaloids in a specific, fixed ratio with phenobarbital to provide peripheral anticholinergic or antispasmodic action and mild sedation. Donnatal contains 0.0194 mg of atropine. According to the FDA and Donnatal labeling, it is "possibly effective" for use as adjunctive therapy in the treatment of irritable bowel syndrome (irritable colon, spastic colon, mucous colitis) and acute enterocolitis. Donnatal is not approved by the FDA as being either safe or effective. According to the FDA, Donnatal use has significant risks: it can cause harm to a fetus if administered to a pregnant woman, can lead to heat prostration if used in hot climates, may cause constipation, and may produce drowsiness or blurred vision.