If you have a sulfa allergy, you should avoid antibiotics such as Bactrim or Septra (TMP/SMX, trimethoprim-sulfamethoxazole). Trimethoprim-sulfamethoxazole is the most commonly used sulfa antibiotic.

Sulfamethoxazole 400mg, trimethoprim 80mg; scored tabs. Sulfamethoxazole inhibits bacterial synthesis of dihydrofolic acid by competing with para-aminobenzoic acid (PABA). Trimethoprim blocks the ...

Sulfamethoxazole 800mg, trimethoprim 160mg; scored tabs. Sulfamethoxazole inhibits bacterial synthesis of dihydrofolic acid by competing with para-aminobenzoic acid (PABA). Trimethoprim blocks the ...

The veterinarian had treated the hamster with ivermectin (0.4 mg per kg body weight, administered subcutaneously) for possible skin parasites and had sent the animal home with trimethoprim-sulfa ...