Others, e.g. tardive dyskinesia may not appear at first but can develop during the course of treatment. The types of EPS are listed below. Parkinsonism affects up to 4 out of 10 people on typical neuroleptic medication and older people are more susceptible to the symptoms at lower does of medication. Symptoms appear within days of starting medication but usually improves spontaneously within 3 months of treatment. Dystonia Sustained muscle contraction, contorting and twisting movements are all signs of dystonia.
Spasms are often painful and distressing and can be frightening.
In extreme cases, dystonic movements can cause injuries such as dislocated jaw. The prevalence of dystonia is rare but is more common in younger people and children. Acute dystonia can appear within one or two days of beginning treatment and is usually transient. Akathisia Characterised by jittery and restless movements, akathisia literally means 'can't sit down'. Jerky, often purposeless limb movements are also characteristic signs.