These drugs include Anticholinergic drugs, such as trihexyphenidyl 5 mg once a day up to 10 to 15 mg orally in 2 or 3 doses (eg, 5 mg orally 2 or 3 times a day), but adverse effects possibly limiting their use Benzodiazepines (particularly clonazepam 0.5 mg orally 2 times a day) Baclofen 10 to 20 mg orally 3 times a day Carbamazepine 100 to 200 mg orally 3 times a day All drugs should be started in low doses (eg, trihexyphenidyl 2 to 2.5 mg orally once a day).