Ontario Registered Pharmacy Technician (RphT) Practice Exam

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A patient with a penicillin allergy is most likely to exhibit sensitivity to:

  1. Tetracycline

  2. Erythromycin

  3. Cephalexin

  4. Gentamycin

The correct answer is: Cephalexin

A patient with a penicillin allergy is most likely to exhibit sensitivity to cephalexin. This is because both penicillin and cephalexin are beta-lactam antibiotics, which have a similar chemical structure. This means that patients who are allergic to penicillin may also have an allergic reaction to cephalexin. Tetracycline, erythromycin, and gentamycin are not beta-lactam antibiotics, so a patient with a penicillin allergy is unlikely to have a reaction to these medications.

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