Keflex side effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:
diarrhea that is watery or bloody;
seizure (convulsions);
fever, sore throat, and headache with a severe blistering, peeling, and red skin rash;
pale or yellowed skin, dark colored urine, fever, confusion or weakness;
easy bruising or bleeding, unusual weakness;
confusion, agitation, hallucinations (seeing things that are not there); or
urinating less than usual or not at all.
Less serious side effects are more likely to occur, such as:
mild nausea, vomiting, diarrhea;
dizziness, tired feeling;
joint pain; or
vaginal itching or discharge.