Some mild side effects may occur when you begin taking this generic Cephalexin antibiotic including, mild nausea, vomiting, diarrhea, dizziness, fatique, joint pain, vaginal itching or discharge. Before you order Cephalexin online, consult your local doctor, because a simple adjustment in your medicinal regimen is warrented. However, if your symptoms worsen, then you may need emergency treatment. Call your local doctor and seek emergency help if you begin to suffer allergic reactions, hives, difficulty breathing, swelling of the face, lips, tongue or mouth, bloody or watery diarrhea, convulsions, fever, sore throat, headache associated with blistering, peeling or rash, jaundice of the eyes or skin, dark urine, fever, confusion or weakness, bruising or bleeding, confusion, hallucinations, and urination less than usual or not at all.