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If i am allergic to penicillin can i take keflex

A 39-year-old member asked:
Dr. Brant Ward
13 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 a ... Read More
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A 21-year-old member asked:
Dr. Alex Martinez
Specializes in Allergy
Maybe: Penicillins (like amoxil) & cephalosporins (like keflex) are both beta-lactam antibiotics named because of their ringed chemical structure. Allergy to ... Read More
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Dr. Gary Moss
Dr. Gary Moss answered
29 years experience Allergy and Immunology
Probably: Most doctors are concerned about cross reactivity between penicillins and cephalosporins, including keflex. In actuality, the cross-reactivity is unc ... Read More
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A 42-year-old member asked:
Dr. Paul Carter
A Verified Doctor answered
A US doctor answered Learn more
No: If you are truly allergic to penicillin, you should avoid all penicillin derivatives and the first generation cephalosporins. Keflex is a first gen. ... Read More
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A 36-year-old member asked:
Dr. Jeffrey Rumbyrt
32 years experience Allergy and Immunology
Yes: Cephalexin (keflex) is a first generation cephalosporin and a very close cousin to penicillin. Though it is not 100% true that all penicillin allergi ... Read More
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A 29-year-old female asked:
Dr. Eric Stansby
26 years experience Emergency Medicine
Don't panic: Scarlet fever is an acute febrile illness, primarily affecting children, caused by group a beta-hemolytic streptococci. Clinical manifestations inclu ... Read More
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4 thanks
A 39-year-old female asked:
Dr. Janet Turkle
35 years experience Plastic Surgery
Yes: Neither of your allergies are related to neosporin.
A 40-year-old female asked:
Dr. Joram Seggev
Specializes in Allergy and Immunology
Not necessarily: While penicillin and Cephalexin (keflex) share some features, allergy to one does not necessarily to one mean that you are allergic to the other. See ... Read More
A 31-year-old female asked:
Dr. Yelena Kipervas
23 years experience Family Medicine
Avoid penicillin: I am not aware of the connection between allergy to PCN and lupus, You need to avoid PCN if you are allergic to keflex.
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A 36-year-old female asked:
Dr. Victor Bonuel
38 years experience Internal Medicine
Not at all.: Have fun!
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A 40-year-old female asked:
Dr. Ankush Bansal
17 years experience Internal Medicine
Not true: It is not an antibiotic nor does it have antibiotics. No antibiotic works against a virus, only bacteria. Keflex and penicillin are antibiotics for b ... Read More

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