Which type of medication is NOT used to treat dystonia?

Dystonia is a movement disorder characterized by sustained muscle contractions and abnormal postures. Treatment often involves medications that can help manage these muscle contractions and related symptoms. Anticholinergics are commonly used because they help reduce the activity of acetylcholine, which plays a role in muscle movements. Antihistamines can also be effective, particularly those with anticholinergic properties, as they may reduce dystonic symptoms.

Benzodiazepines, while primarily used to treat anxiety and provide muscle relaxation, can also have some efficacy in certain cases of acute dystonic reactions. However, they are not the first-line treatment specifically aimed at chronic dystonia.

Antidepressants, particularly SSRIs or SNRIs, are generally not effective for treating dystonia and are not indicated for this condition. They address mood disorders but lack the mechanisms necessary to alleviate the movement symptoms associated with dystonia. Therefore, they are correctly identified as the type of medication not used for treating this specific disorder.