Cephalexin is the generic form of an antibiotic prescribed to treat certain bacterial infections. Brand names of cephalexin include Keflex, Biocef and Zartan. According to MedlinePlus, cephalexin is primarily used to treat infections such as bacterial pneumonia and those of the bone, ear, skin and urinary tract. It is available in tablet, capsule or liquid form, and is taken by mouth. Cephalexin should be taken with food to avoid stomach upset.
Allergic Reaction
Some patients may experience an allergic reaction to cephalexin, according to RxList. Symptoms of an allergic reaction may include swelling of the lips, tongue or face, difficulty breathing, chest pain or hives. An itchy, red skin rash may develop over the body. Patients experiencing signs of allergic reactions to cephalexin should seek medical attention immediately. These symptoms usually subside with discontinuation of the drug.
Gastrointestinal Effects
RxList reports that diarrhea is the most common gastrointestinal side effect associated with cephalexin use. This may be due to cephalexin killing the healthy bacteria that occur in the gastrointestinal tract along with the infectious bacteria. Healthy bacteria in the gastrointestinal tract helps form stools and keeps the digestive process working regularly. Other gastrointestinal side effects of cephalexin may include nausea, vomiting and abdominal cramping.
Neurological Effects
In rare cases, neurological side effects may occur while taking cephalexin. According to Drugs.com, patients may experience confusion, agitation or hallucinations. Seizures have also occurred with cephalexin use. RxList adds that seizures are more likely to develop in patients with a history of kidney disease or impairment. If seizures occur, cephalexin should be discontinued.
Other Effects
Other possible side effects of cephalexin use include feelings of fatigue or excessive tiredness, joint pain or sore throat. Female patients may experience vaginal itching or discharge. This is due to cephalexin killing healthy bacteria in the vaginal tract that keep infectious sources--like the fungi that cause yeast infections--under control.
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