Some side effects that may occur when you buy keflex include, watery or bloody diarrhea, convulsions, fever, headache with severe blistering and redness of the skin, jaundice, dark colored urine, weakness, easy bruising or bleeding, confusion, agitation or hallucinations, trouble passing urine. If you experience any of these then call your local doctor immediately and get emergency asistance. Milder side effects may crop up at the beginning of treatment. So before you order keflex online, check with your local physician about these mild side effects including, mild nausea, vomiting and diarrhea, dizziness, fatique, joint pain, vaginal itching or discharge. These side effects can usually be controlled with an adjustment in your treatment regimen by your local doctor.