nausea incidence

Can Keflex Cause Diarrhea In Dogs? Side effects to cephalexin are usually mild and rarely occur. It may cause gastrointestinal upset including lack of appetite, vomiting, and diarrhea. If these side effects become severe, contact your veterinarian. Can Keflex cause severe diarrhea? Nausea and diarrhea Diarrhea is the most common side effect of Keflex, occurring