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Keflex: Side Effects

Cephalexin  [Oral]


You may experience the following side effects with the use of this drug:

Common Symptoms

  • Mild diarrhea
  • Nausea or vomiting
  • Stomach cramps
  • Headache
  • White patches in the mouth (oral candidiasis)
  • Vaginal yeast infecrtion

Less Common to Rare Symptoms

  • Severe diarrhea with mucus or blood in stool
  • Unusual weakness or tiredness
  • Severe allergic reaction (with such symptoms as hives, rash, difficulty breathing or swelling of the lips, tongue and face)
  • Temporary neutropenia (low levels of neutrophils in the blood)
  • Anemia

Life-threatening Symptoms

  • Anaphylaxis (severe allergic reaction)
  • Difficulty breathing

Possible Overdose Symptoms

  • Abdominal cramps
  • Seizures
  • Severe nausea or vomiting
  • Severe diarrhea with mucus or blood in stool

What to Do in Case of Overdose

Dial 911 for emergency help or call your poison control center.

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Updated on: 02/01/10

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