Which medication regimens are commonly used in the treatment of anaphylaxis?

Updated: May 16, 2018
  • Author: S Shahzad Mustafa, MD; Chief Editor: Michael A Kaliner, MD  more...
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The following regimens are used commonly by clinicians, though very little hard data concerning the natural history of anaphylaxis treated in the ED exists. In light of this, do not construe the following as an unqualified recommendation or as a standard of care. Evidence for efficacy of H2 -blocker antihistamines is particularly sparse.

H1 -blocker antihistamine treatment is as follows:

  • Diphenhydramine (Benadryl) - Adults: 25 mg PO q6h for 2-5 d; Children: 1 mg/kg PO q6h for 2-5 d

  • Hydroxyzine (Atarax) - Adults: 25 mg PO q8h for 2-5 d; Children: 1 mg/kg PO q8h for 2-5 d

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