Common and Rare Reactions to Cephalexin

Common Cephalexin Side Effects

Cephalexin has been studied extensively in clinical trials, with thousands of people worldwide having been evaluated. In these studies, the side effects that occur in a group of people taking the drug are documented and are then compared to side effects that occur in another group of people not taking the medicine. As a result, it is possible to see what side effects occur, how often they appear, and how they compare to the group not taking the medicine.
 
Based on these studies, the most common side effects with cephalexin occurring in either adults or children include:
 
 

Rare Cephalexin Side Effects

Rare side effects with cephalexin occur in less than 1 percent of people taking the drug. Because these side effects are so uncommon, it is difficult to tell whether they are because of the medication or something else.
 
Some of these rare side effects include but are not limited to:
 
  • Hallucinations
  • Fatigue
  • Joint pain
  • Bloody diarrhea
  • Vomiting
  • Anemia
  • Low platelets in the blood (thrombocytopenia)
  • Vaginal discharge
  • Confusion
  • Seizures
  • Serious intestinal infection (enterocolitis).
     

Final Thoughts on Cephalexin Side Effects

You may experience some or none of the cephalexin side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have side effects from a medicine that you have never tried. Therefore, make sure to let your healthcare provider know if you develop any side effects while taking the drug. Also, let your healthcare provider know if you develop something that "just does not seem right." While it may not be a side effect of cephalexin, your healthcare provider will be able to diagnose and treat the problem.
 
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