Trimethoprim-sulfamethoxazole -- a widely used antibiotic sold as Septra, Bactrim, and others -- has a set of adverse reactions that range from minor to potentially fatal, according to a literature ...

People with sulfa allergies should avoid medications containing sulfonamides. Bactrim, Septra, and Silvadene are examples of drugs containing sulfa. Non-sulfa antibiotics like penicillins and ...