Re-PB Hyos Elixir is a medication used to treat various gastrointestinal disorders such as irritable bowel syndrome, colitis, and peptic ulcers. The main active ingredient in this medication is hyoscyamine, which works by relaxing the muscles in the stomach and intestines. Synonyms for Re-PB Hyos Elixir include Belladonna alkaloid combination, Hyoscyamine sulfate, and Levsin. These medications also contain hyoscyamine and are used to treat similar conditions. Other medications that may be used instead of Re-PB Hyos Elixir include dicyclomine, glycopyrrolate, and scopolamine. It is important to speak with a doctor before switching medications or starting a new one.