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Related Experiment Videos

Immediate allergic reactions to amoxicillin

J M Vega1, M Blanca, J J García

  • 1Allergy Section, Carlos Haya Regional Hospital, Málaga, Spain.

Allergy
|May 1, 1994
PubMed
Summary

Patients allergic to amoxicillin (AX) may have selective allergies, not cross-reacting with penicillin. Specific diagnostic tests are crucial for accurate amoxicillin allergy diagnosis and safe treatment.

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Area of Science:

  • Immunology
  • Allergy and Clinical Immunology
  • Pharmacology

Background:

  • Beta-lactam antibiotics are common causes of allergic reactions.
  • Distinguishing selective amoxicillin allergy from cross-reactivity with other penicillins is clinically important.
  • Accurate diagnosis impacts patient management and antibiotic selection.

Purpose of the Study:

  • To evaluate patients with suspected beta-lactam antibiotic allergy.
  • To determine if immediate allergic responses were selective to amoxicillin (AX) or due to cross-reactivity.
  • To identify patients with immediate AX allergy who tolerate penicillin (PG).

Main Methods:

  • Clinical history, skin tests (benzylpenicilloyl-poly-L-lysine, benzylpenicillin, ampicillin, amoxicillin), and radioallergosorbent tests (RAST) were employed.

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  • Controlled challenge tests were used to confirm tolerance or sensitivity.
  • Specific AX-related reagents were utilized for diagnosis.

    • Main Results:

    • 54 out of 177 patients (30.5%) were diagnosed with immediate AX allergy and tolerated PG.
    • Anaphylaxis occurred in 37 patients (69%) with AX allergy.
    • Skin tests for AX were positive in 63% and RAST for AX in 41% of patients, while cross-reactivity markers were largely negative.

    Conclusions:

    • The study identified the largest group of AX-allergic patients tolerating PG.
    • Accurate diagnosis of selective amoxicillin allergy requires specific AX-related diagnostic reagents.
    • Further research is needed to understand the prevalence and improve diagnostic efficacy for amoxicillin allergy.