A 39-year-old member asked:
allergic to penicillin can i take keflex?
1 doctor answer
Dr. Brant Ward answered
12 years experience Allergy and Immunology
Likely, not certain: The majority of people who are told they are allergic to penicillin are not actually so (they get rashes for other reasons, e.g.). Of those that are allergic, about 70% or more will lose the allergy after about 10 years. If you are still allergic, there is about a 10% chance of cross-reaction to 1st-gen cephalosporins like keflex. An allergist can perform testing to judge your risk for a reaction.
Answered on Oct 24, 2017
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