The portion of the GASTROINTESTINAL TRACT between the PYLORUS of the STOMACH and the ILEOCECAL VALVE of the LARGE INTESTINE. It is divisible into three portions: the DUODENUM, the JEJUNUM, and the ILEUM.
More specific conditions that are subtypes of Intestine, Small in the MeSH hierarchy.
10 drugs (6 approved, 4 experimental)