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Related Experiment Videos

Nonsedating histamine H1-receptor antagonists.

K V Mann1, J P Crowe, K J Tietze

  • 1Department of Pharmacy Practice/Pharmacy Administration, Philadelphia College of Pharmacy and Science, PA 19104.

Clinical Pharmacy
|May 1, 1989
PubMed
Summary

New nonsedating histamine H1-receptor antagonists like terfenadine and loratadine offer effective allergy relief without drowsiness. These antihistamines provide good alternatives to older medications for seasonal allergic rhinitis and chronic urticaria.

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Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Drug Development

Background:

  • Review of nonsedating histamine H1-receptor antagonists.
  • Comparison with older antihistamines.
  • Focus on terfenadine, astemizole, loratadine, and acrivastine.

Purpose of the Study:

  • To review the chemistry, pharmacology, pharmacokinetics, clinical efficacy, adverse effects, and dosages of four nonsedating H1-receptor antagonists.
  • To evaluate their effectiveness and safety in treating allergic conditions.
  • To compare them with traditional antihistamines.

Main Methods:

  • Literature review of terfenadine, astemizole, loratadine, and acrivastine.
  • Analysis of clinical trial data on efficacy and adverse effects.
  • Pharmacokinetic and pharmacodynamic comparisons.

Main Results:

  • Terfenadine and astemizole are structurally distinct from older antihistamines.
  • All four drugs competitively block histamine receptors.
  • Clinical trials show efficacy comparable or superior to conventional antihistamines for allergic rhinitis and urticaria.
  • None of the agents impair psychomotor activity.
  • Adverse effects are infrequent, including dry mouth and skin reactions.

Conclusions:

  • Nonsedating H1-receptor antagonists are effective alternatives to classic antihistamines.
  • They offer significant benefits for patients with seasonal allergic rhinitis, chronic rhinitis, and chronic urticaria.
  • Reduced sedative effects and convenient dosing schedules improve patient compliance and quality of life.

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