Side effects from cephalexin are possible. Call your doctor right away if you experience any of the following symptoms, or seek emergency medical attention if you do: extreme fatigue, agitation, headache joint pain, watery or bloody stools, stomach cramps, or fever during treatment or for up to two or more months after stopping treatment, rash, itching, and swelling of the face, throat, tongue, lips, and eyes, difficulty breathing, or rectal or genital itching. Tell your doctor if any of these symptoms are severe or persistent, including: dizziness, extreme fatigue, agitation, confusion, headache, joint pain, watery or bloody stools, stomach cramps, fever, rash, itching, hives, swelling of the face, throat, tongue, lips, and eyes, difficulty breathing or swallowing, and a return of fever.
Cephalexin drug interactions (more detail) Not all possible drug interactions are covered in this list. Cephalexin may interact with other medications, including prescription and OTC drugs, vitamins, and herbal remedies. Tell your doctor about all your other medicines, especially: This isn't a comprehensive list. or probenecid; metformin.
The "bad" bacteria C. difficile can lead to diarrhea. seizures linked to patients with impaired kidney function Hypersensitivity reaction: Cephalexin may cause an allergic reaction. These are just a few of the serious side effects that have been reported. Symptoms of an allergic reaction to cephalexin include: skin rash itching hives difficulty breathing or swallowing sore throat vaginal infections dizziness fatigue headache agitation confusion hallucinations joint pain Clostridium difficile associated diarrhea: Cephalexin and other antibiotics can kill the “good” bacteria in the colon leading to a growth of C. difficile bacteria. Inform your doctor if you are allergic to cephalosporin antibiotics like cephalexin (Keflex) and cefuroxime (Ceftin) or penicillin antibiotics like ampicillin and moxicillin (Moxatag).