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Aminopenicillin-induced exanthema allows treatment with certain cephalosporins or phenoxymethyl penicillin

Jiri Trcka1, Cornelia S Seitz, Eva-B Bröcker

  • 1Department of Dermatology, Venerology and Allergology, University of Würzburg, Würzburg, Germany.

The Journal of Antimicrobial Chemotherapy
|May 19, 2007
PubMed
Abstract

Insights

Patients with aminopenicillin-induced exanthema can often tolerate specific cephalosporins or phenoxymethyl penicillin. Allergy testing helps identify safe beta-lactam antibiotics, avoiding less effective alternatives and antibiotic resistance.

Area of Science:

  • Infectious Diseases
  • Clinical Immunology
  • Pharmacology

Background:

  • Aminopenicillin-induced exanthema complicates infectious disease management.
  • Cross-reactivity concerns often lead to avoidance of all beta-lactams.
  • Alternative antibiotics may be less effective and contribute to resistance.

Purpose of the Study:

  • To demonstrate that patients with aminopenicillin-induced exanthema can safely receive specific beta-lactams.
  • To evaluate the potential for cross-reactivity between aminopenicillins and other beta-lactams.
  • To provide evidence for personalized antibiotic selection in allergic patients.

Main Methods:

  • Skin testing followed by oral challenges.
  • Identification of tolerated beta-lactams in patients with confirmed hypersensitivity.
  • Focus on non-immunoglobulin E (IgE)-mediated reactions.

Main Results:

  • 97.2% of patients tolerated cephalosporins lacking an aminobenzyl side chain (e.g., cefpodoxime, cefixime).
  • 71.8% of patients tolerated phenoxymethyl penicillin.
  • High tolerance rates suggest limited cross-reactivity in this patient group.

Conclusions:

  • Most patients with non-IgE-mediated hypersensitivity to aminopenicillins tolerate certain cephalosporins and phenoxymethyl penicillin.
  • Skin and drug challenge tests are valuable for assessing individual cross-reactivity.
  • This approach can guide safer antibiotic selection and reduce reliance on alternative agents.

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