http://www.medications.com/effect/view/33949 My husband had a cyst on his face. His primary doctor gave him Bactrim. The first week was fine, but then he got really sick and had to to go the ER. He was doubled over in agony, screaming, nausea. He was admitted. They scoped his stomach, CAT scan, X Fri, 29 Aug 2008 09:32:51 -0400 http://www.medications.com/effect/view/33949?item=11742 A percentage of people are allergic to the family of medicines called "Sulphonanide" or "Sulpha Meds". I had an allergic reaction where I skin broke out in a terrible rash. There are more extreme reactions that can come from a Sulpha allergy. My doctor http://www.medications.com/effect/view/33949?item=11742