Drug Safety

, Volume 21, Supplement 1, pp 33–38

Cardiotoxicity of Histamine and the Possible Role of Histamine in the Arrhythmogenesis Produced by Certain Antihistamines

  • Jesús Llenas
  • Ignasi Cardelús
  • Ascensión Heredia
  • Fernando de Mora
  • Robert W. Gristwood
Review Article

DOI: 10.2165/00002018-199921001-00005

Cite this article as:
Llenas, J., Cardelús, I., Heredia, A. et al. Drug-Safety (1999) 21: 33. doi:10.2165/00002018-199921001-00005

Abstract

Since 1990 it has repeatedly been reported that some histamine H1 receptor antagonists (e.g. terfenadine and astemizole) are able to produce ventricular arrhythmias (e.g. torsade de pointes) when they are given at dosages above the therapeutic range and/or administered together with cytochrome P-450 3A4 inhibitors, such as ketoconazole or erythromycin. Although the mechanism by which these arrhythmias are produced remains unclear, the recently reported ability of these drugs to block outward K+ currents has been suggested as the cause of their arrhythmogenic effects. Alternatively, we have observed that some H1 antihistamines, including terfenadine and astemizole, are able to release histamine from guinea-pig cardiac mast cells. Thus, we have proposed that the liberated histamine, acting through an H2 receptor-stimulating mechanism, can prolong the action potential duration and hence induce arrhythmogenic effects. This paper describes experimental observations supporting the hypothesis that some H1 antihistamines can induce severe cardiac arrhythmias via the local release of histamine.

Copyright information

© Adis International Limited 1999

Authors and Affiliations

  • Jesús Llenas
    • 1
  • Ignasi Cardelús
    • 1
  • Ascensión Heredia
    • 1
  • Fernando de Mora
    • 2
  • Robert W. Gristwood
    • 3
  1. 1.Department of Pharmacological Development, Research CentreAlmirall Prodesfarma S.A.BarcelonaSpain
  2. 2.Department of Pharmacology, Facultad de VeterinariaUniv. Autónoma de BarcelonaBarcelonaSpain
  3. 3.Stevenage Biosciences LtdStevenage, HertfordshireEngland