Antihistamine onset of action: the importance to the patient.

Allergy Asthma Proc

Department of Pediatrics, Medical College of Georgia, Augusta, Georgia 30912, USA.

Published: August 2004

Although some older antihistamines have a relatively slow onset of action, modern agents indicate an efficacy between 1 and 3 hours of administration. For patients who use antihistamines regularly, a short onset of action is relatively unimportant. When antihistamines are used as needed, either because of poor compliance or in accordance with emerging therapeutic guidelines, antihistamines with a short onset of action are preferable.

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