Cephalosporins are sort of related to penicillins, and if one has an allergy to either a cephalosporin or a penicillin, there is a 5 to 15 percent chance that they will react to the other as well. Keflex® (cephalexin), Ceclor® (cefaclor) and Cefzil® are the most common. These are all available as capsule/tablet or suspension. The suspension form of these medications must be refrigerated and are good for 14 days after being mixed. All of them can be given with or without food. They may cause some stomach upset and diarrhea. Cephalosporins are considered to be a little more powerful than penicillins, but still cover the same types of infections. They are used in individuals with repeated infections or when a penicillin did not work.

Note: This information is not meant to supersede physicians' instructions. If there are any questions on a prescription, contact the prescribing physician or a pharmacist.

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