It is important to avoid the use of ampicillin (and amoxicillin (amoxycillin *)) in glandular fever because it increases the occurrence of a macular, pruritic rash.
A recent review suggests that the incidence of this occurring is not as high as previously thought (1)
Even though it is associated with penicillin, this rash does not represent a true penicillin allergy.
It typically resolves in a few days after discontinuing the antibiotic. (2)
* Amoxicillin became the British Approved Name for amoxycillin in 2004
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