Drug information provided by: Micromedex

If your symptoms do not improve within a few days, or if they become worse, check with your doctor.

Serious allergic reactions can occur with this medicine. Check with your doctor right away if you have chest pain, blistering, peeling, or loose skin, red skin lesions, large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs, severe acne or skin rash, sores or ulcers on the skin, trouble breathing or swallowing, or fever or chills while you are using this medicine.

Cephalexin may cause diarrhea, and in some cases it can be severe. Do not take any medicine or give medicine to your child to treat diarrhea without first checking with your doctor. Diarrhea medicines may make the diarrhea worse or make it last longer. If you have any questions about this or if mild diarrhea continues or gets worse, check with your doctor.

Before you or your child have any medical tests, tell the medical doctor in charge that you are using this medicine. The results of some tests may be affected by this medicine.

Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.