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Sulfa is a term used to describe a class of drugs called sulfonamides. This includes antibiotic and non-antibiotic sulfonamides. Septra and Bactrim, (brand names for trimethoprim-sulfamethoxazole), sulfacetamide eye drops, and dapsone are examples of sulfa antibiotics. Sulfonylureas and celebrex are common non antibiotic sulfas.
Sulfates are "salts" of various medications, including Polymyxin B sulfate and Neomycin sulfate. These medications are not sulfonamides, and generally speaking they do not contain sulfa drugs.
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