The indicence of allergy to cephalosporins in patients with history of penicillin allergy is approximately 8% (1). However the data sheets recommend that cephalosporins are used only with extreme caution in patients with a known type I reaction to penicillin.
There appears to be cross-reactivity between penicillins and imipenem. There appears to be significant cross-reactivity between penicillins and monobactams.
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