Antibiotics Home > Keflex Reactions

Keflex® (cephalexin) is a prescription medication approved to treat bacterial infections and prevent heart valve infections. Although most people tolerate this medication well, it is possible to experience adverse reactions. Keflex, for example, can cause several side effects, such as:
 
While most side effects tend to be minor and are generally easy to treat, make sure to notify your healthcare provider right away if you develop serious reactions to Keflex, such as bloody stools, severe diarrhea, or difficulty breathing.
 
Also, negative Keflex reactions may occur if you have certain medical conditions (such as kidney disease), certain allergies, or if you are pregnant or breastfeeding. To help avoid complications, talk to your healthcare provider about any other medical conditions you may have and any other medications you are taking before starting treatment with Keflex.
 
(Click Keflex Side Effects and Precautions and Warnings With Keflex for a more in-depth look at the potentially negative reactions with Keflex, including information on possible side effects and some safety concerns to be aware of before using this medication.)
 
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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