This invention provides the use of a 5-HT4 receptor antagonist in the manufacture of a medicament for treating or preventing heart failure. Particular heart disorders to be treated are selected from the group comprising chronic heart failure, congestive heart failure, chronic congestive heart failure and heart failure resulting from ischaemic heart disease. Methods of treating heart failure using 5-HT4 receptor antagonists and pharmaceutical compositions containing 5-HT4 receptor antagonists are also provided.
