Piribedil: Antiparkinsonian Properties and Potential Clinical Utility in Dopaminergic Disorders

Aravind      Mittur

Abstract

Piribedil is a relatively unknown non-ergot dopamine agonist that has been in clinical use for over 3 decades for the symptomatic management of Parkinsons disease (PD). Piribedil is currently not approved for therapeutic use in the United States. It has unique pharmacological and pharmacokinetic attributes with a profile that is unlike many direct dopamine agonists. In addition to proven motor effects in PD, nonclinical and clinical evidence over the last few years indicate that piribedil may also exert beneficial non-motor effects such as in mild cognitive impairment and frontal cognitive dysfunctions prevalent in PD patients. This review presents the pharmaceutics, pharmacological pleiotropy, and clinical properties of piribedil with a focus on its utility in the therapy of motor and non-motor symptoms in PD and related dopaminergic disorders. The varied pharmacological, behavioral, and clinical properties of piribedil are related to current knowledge on its multifunctional pharmacology. Properties of piribedil that may differentiate it from other dopamine direct agonists are noted. As a partial agonist of dopamine D2 and D3 receptors with functional α2 adrenolytic activity, piribedil may be an alternative to the inherent anti-akinetic (beneficial) and dyskinetic (unwanted) effects of some dopamine replacement therapies. The activation of limbic dopamine receptors by piribedil and stimulation of acetylcholine release in the frontal cortex provide a basis for improving mood and cognitive disturbances. Additionally, α2 antagonism and weak 5-HT1A agonism may provide beneficial effects on dyskinesias, neuropsychiatric symptoms in PD, neurotrophic effects, and reduced sedation. The adverse effects of piribedil generally mirror its monoaminergic activity and include nausea, vomiting, abnormal sleep events, and psychiatric effects such as psychosis and compulsive disorders. While the therapeutic potential of piribedil may yet to be fully realized, investigations of its safety and toxicology under current standards of drug development are warranted before exposure to new patient populations.

Keywords: Adrenergic antagonist, attention, cognitive dysfunction, dopamine agonist, drug repositioning, executive functions, Parkinson's disease, tremor, neurodegenerative disorder, substantia nigra pars compacta, striatal dopamine, basal ganglia, brains, neurons, locus coeruleus, dementia, depression, psychosis, anxiety, dopamine receptors, levodopa, dyskinesias, acetylcholinesterase inhibitors (AChEi), nausea, somnolence, peripheral edema, hypotension, plasma levels, pharmacokinetics, drug exposures, suboptimal dosing, dose-dependent receptor, CNS disease, insomnia, dystonia, smoking cessation, dysfunction, alopecia, schizophrenia, odorless, crystalline, bitter taste, properties, colon, absorption, urine, elimination, plasma, N-oxidation, isoenzymes, catechol, bioavailability, half-life, renal excretion, oral, frontotemporal dementia, dose, dorsal raphe nucleus (DRN), axial symptoms, sublingual