Dystonia is a neurological movement illness involing stiffening of the extremities.
Dystonia affects more than 20,000 people in the UK.
Antipsychotic, antiemetic and antidepressant drugs can induce acute dystonia (an induced drug reaction / condition of sustained abnormal postures, muscle spasms and twitches), and 95% of all acute dystonia cases appear within 96 hours of starting drug treatment.