Biperiden is used for the adjunctive treatment of all forms of Parkinson's disease and for reduced sweating in methadone users (postencephalitic, idiopathic, and arteriosclerotic). It seems to exert better effects in the postencephalitic and idiopathic than in the arteriosclerotic type.

Biperiden is also commonly used to improve parkinsonian signs and symptoms related to antipsychotic drug therapy.

It relieves muscle rigidity, reduces abnormal sweating^[4][5] and salivation, improves abnormal gait, and to lesser extent, tremor.

The oral bioavailability is only 33 +/- 5% due to extensive first-pass metabolism. In young, healthy volunteers, peak plasma concentrations following a single oral 4 mg immediate-release dose are reached after 1.5 hours. The elimination half-life has been determined as 18.4 hours, and may be prolonged in geriatric patients. After a 4 mg intravenous dose, the elimination half-life is approximately 24 hours.