A 53-year-old female asked:
Disclaimer

ive been on keflex 6 days. last night i had a hive about the size of a dime on left breast. i took 2 benadryl and its almost gone this morning. could keflex cause 1 hive? should i finish the last dose? or skip it? am i now allergic to keflex?

1 doctor answer
Dr. Robert Kwok
33 years experience Pediatrics
Cannot tell for sure: It is possible to be allergic to any medication. A medication has other ingredients, such as stabilizers, preservatives, pH buffers, etc..., and a person may be allergic to one of the other ingredients. Also, a person can be ok with the drug, but react to a breakdown product of the drug, or react to a "bound" combination of the drug+substance (the substance may be from the person's own body).
Answered on Feb 21, 2020

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