My son went to the emergency room last week. He has a terrible large sore on his left leg. His leg is swollen as well as his ankle and the top of his foot. I figured it was a staph infection after seeing the wound. He went to the ER room on 1/9/17 and was given the antibiotics for the infection. He was prescribed a generic for Bactrim DS 800-160. He is having problems breathing and it is very painful for him. He has a problem relaxing his body which is increasing his pain.