Tardive dyskinesia in Tourette syndrome.

Three patients are reported who developed oral-buccal-lingual movements typical of tardive dyskinesia while being treated with stable doses of haloperidol for Tourette syndrome. In each case signs resolved within a number of weeks after medication was discontinued. One of the patients experienced recurrence of the dyskinesia during a challenge with phenothiazine tranquilizers. In each case the dose of haloperidol was well within the usual therapeutic range. A strong family history of movement disorders, including Tourette syndrome, was present in each family.