I was prescribed this as an inexpensive option to treat a long-term sinus infection in March 2008. I had no prior history of allergic reactions or prior health problems. After 3 days (6 doses) my whole body was in throbbing pain, I felt like my skin was on fire, and I was seeing spots, and had difficulty breathing. I initially had NO RASH or visible/external signs while taking the medication. I immediately stopped taking the medication and saw my doctor, but symptoms persisted for a week. My doctor prescribed prednisone, and had to up the dosage two weeks later when a rash formed over my torso and legs and persisted for 2 months.