"I was prescribed Cephalexin by a doctor at a hospital I visited when my arm swelled up and the rash I had got very severe. I had been exposed to Poison Sumac three weeks prior and it just went nuts in that third week. When the swelling entered my hand, I knew I was in trouble. I was prescribed Prednisone which got rid of the swelling splendidly and Cephalexin to deal with the infection. The Cephalexin dosage was 4 per day for 7 days. It made me overly anxious, I had trouble sleeping, my stomach was little upset, and I ended up with vaginal discharge (really yucky), but it was so important to get rid of that infection, I took the entire prescription. My arm is in much better shape though not 100% yet. I am satisfied with the positive results."