They are not used in people who have motor tics, whose brothers or sisters have tics or a family history of Tourettes syndrome.
Tourette syndrome (TS) is an inherited disorder of the nervous system, characterized by a variable expression of unwanted movements and noises (tics).
The symptoms of Tourette syndrome are usually motor and/or vocal tics, although in some children other symptoms such as socially inappropriate comments, and socially inappropriate or self-injurious behaviors sometimes occur.
Some studies suggest that the tics in Tourette syndrome are caused by an increased amount of a neurotransmitter called dopamine.
The principal symptoms of Tourette syndrome include simple and complex motor and vocal tics.