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A member asked:
Does keflex usually cause anaphylaxsis right away?
A doctor has provided 1 answer
Anaphylaxis: is a delayed hypersensitivity reaction and usually will present after the second or third exposure to the same agent. about 15-20 % of people allergic to penicillin are also allergic to Keflex ( cephalexin ).
Answered 10/1/2016
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