Depression in Parkinson's disease: the effectiveness and risk of pharmacotherapy. Clinical review.

Parkinson's disease (PD) is a neurological disease with a heterogeneous pattern of neurological symptoms and concomitant psychiatric syndromes. These syndromes are triggered by alterations to neurotransmission that are likely common for both neurological and psychiatric symptoms. Syndromes such as depression, anxiety, or cognitive impairment can precede motor symptoms of PD and delay its diagnosis. Recently, questions related to aetiological factors and treatment strategies of depression in PD have become a growing concern of PD researchers. This article describes the main features of depression in PD and presents current hypotheses on its aetiology and recommended treatment modes.