I'm allergic to penicillin, can I take keflex?

answered:

Maybe

Fever
Penicillins (like Amoxil) & cephalosporins (like Keflex) are both beta-lactam antibiotics named because of their ringed chemical structure. Allergy to penicillins is sometimes directed against this ring, and an allergic reaction may also occur if a similar antibiotic is taken. It is estimated that about 10% of penicillin-allergic patients are also allergic to cephalosporins like Keflex.
Sign Up

Get personalized answers from doctors!

Antibiotic Amoxil Keflex Allergic reaction Child allergies Cephalexin Amoxicillin Penicillin

answered:

Probably

Doctors
Most doctors are concerned about cross reactivity between penicillins and cephalosporins, including keflex. In actuality, the cross-reactivity is uncommon between these two classes. Also, most people who think that they are allergic to penicillin are not. An allergist can test to see wether you are allergic to penicillin. He could also confirm whether it would be safe to take Keflex.
Sign Up

Get personalized answers from doctors!

Allergies Cephalexin Keflex Penicillin