Abstract: The invention relates to the new use of gastrointestinal peptide hormones selected from the class consisting of glucagon-like peptide-1 (GLP-1) and derivatives thereof having anti-secretory effects and smooth muscle relaxatory properties in the gastrointestinal tract for the manufacture of a pharmaceutical composition for the treatment of functional dyspepsia and/or irritable bowel syndrome. The invention also relates to a pharmaceutical composition comprising a combination of at least one member selected from said class consisting of GLP-1 and derivatives thereof with one or more other gastrointestinal peptide hormone(s) or derivative(s) thereof together with pharmacologically acceptable additives and to a method of treating functional dyspepsia or irritable bowel syndrome or both by administering an effective amount of at least one member of said class consisting of GLP-1 and derivatives thereof having effects and properties as mentioned above.