How are you? Sulfa drug is a class of synthetic chemical substances derived from sulfanilamide, or para-aminobenzenesulfonamide. Sulfa drugs are used to treat bacterial infections, although they have largely been replaced for this purpose by antibiotics.
Cephalexin, on the other hand, is a first-generation cephalosporin antibiotic. It is a useful alternative to penicillins in patients with penicillin hypersensitivity.
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