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Drug-induced myoclonus: frequency, mechanisms and management

Félix Javier Jiménez-Jiménez1, Inmaculada Puertas, María de Toledo-Heras

  • 1Department of Medicine - Neurology, Hospital "Príncipe de Asturias", Universidad de Alcalá, Alcalá de Henares, Madrid, SpainNeuro-Magister S.L. Company, Madrid, Spain. fjimenez.hupa@salud.madrid.org

CNS Drugs
|January 20, 2004
PubMed

Insights

Myoclonus, sudden involuntary movements, can be caused by various disorders or adverse drug reactions. Levodopa, cyclic antidepressants, and bismuth salts are implicated, with potential links to increased serotonergic activity.

Area of Science:

  • Neurology
  • Pharmacology

Background:

  • Myoclonus presents as sudden, brief, involuntary muscle contractions or lapses.
  • It can stem from neurodegenerative, metabolic, or infectious central nervous system (CNS) disorders.
  • Myoclonus is also recognized as an adverse effect of certain medications.

Purpose of the Study:

  • To review the causes and mechanisms of myoclonus, particularly drug-induced forms.
  • To identify specific drugs associated with myoclonus.
  • To discuss potential pharmacological pathways and management strategies.

Main Methods:

  • Literature review of studies on myoclonus.
  • Analysis of evidence linking specific drugs to myoclonus.
  • Examination of proposed pharmacological mechanisms, including serotonergic pathways.

Main Results:

  • Level II evidence supports levodopa, cyclic antidepressants, and bismuth salts as causes of myoclonus.
  • Other drugs are less definitively associated with myoclonus induction.
  • Increased serotonergic transmission is a potential mechanism for drug-induced myoclonus.

Conclusions:

  • Drug-induced myoclonus is a recognized adverse effect.
  • Withdrawal of the causative drug often resolves symptoms.
  • Specific treatments may be necessary in persistent cases.

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