Movement disorders induced by gastrointestinal drugs: two paediatric cases.

A number of frequently prescribed gastrointestinal drugs can cause movement disorders in children, as well as in adults. In our centre for paediatric neurology, we saw a 3-year-old girl with abnormal movements mostly of the legs with an inner restlessness (akathisia) while using cisapride. Another patient, a 17-year-old male, developed a hemiballism (a fierce movement of one arm and shoulder with a hurling appearance) while using ranitidine for gastric distress. In both children, the movement disorder disappeared after discontinuing the drug. The pathophysiological mechanisms of these drug-induced movement disorders might be related to the central function of histamine in the developing brain. These cases illustrate the importance of being alert for possible drug-induced events early in the process of diagnosing abnormal movement disorders.