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Related Experiment Videos

Beta-blockers and central nervous system side effects.

J McAinsh1, J M Cruickshank

  • 1Imperial Chemical Industries PLC, ICI Pharmaceuticals, Macclesfield, Cheshire, U.K.

Pharmacology & Therapeutics
|January 1, 1990
PubMed
Summary
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Hydrophilic beta-blockers, like atenolol, show fewer central nervous system (CNS) side effects than lipophilic ones, such as propranolol. This difference relates to how easily drugs cross the blood-brain barrier.

Area of Science:

  • Pharmacology
  • Neuroscience
  • Cardiology

Background:

  • Beta-adrenergic blocking drugs (beta-blockers) are widely used for cardiovascular and noncardiovascular conditions.
  • Beta-blockers are associated with a low incidence of central nervous system (CNS) side effects.
  • The variability in CNS side effect incidence among different beta-blockers is not fully understood.

Purpose of the Study:

  • To investigate the relationship between the lipophilicity of beta-blockers and their incidence of CNS side effects.
  • To compare the CNS side effect profiles of four specific beta-blockers: propranolol, pindolol, metoprolol, and atenolol.

Main Methods:

  • A comprehensive literature review of published clinical papers comparing the four beta-blockers.
  • Assessment of reported CNS side effects, including sleep disturbances, dreaming, nightmares, and hallucinations.

Related Experiment Videos

  • Pharmacokinetic analysis considering lipophilicity and blood-brain barrier penetration.

    • Main Results:

    • The overall incidence of CNS side effects for the studied beta-blockers is generally low.
    • Hydrophilic atenolol exhibited the lowest incidence of CNS side effects.
    • Lipophilic propranolol and moderately lipophilic pindolol showed the highest incidence of CNS side effects, with metoprolol in an intermediate position.
    • Effects on short-term memory were minimal or absent across all studied drugs.

    Conclusions:

    • The lipophilicity of beta-blockers influences their penetration of the blood-brain barrier and subsequent CNS side effect incidence.
    • Hydrophilic beta-blockers are associated with a lower risk of CNS side effects compared to lipophilic agents.
    • Clinical relevance of psychometric testing in this context requires further clarification.