Sulfabromomethazine is a long-acting derivative of sulfamezathine that is used in the poultry, swine and cattle industries for the treatment of coccidiosis and various bacterial infections. Single oral doses of the drug have been used to treat calf diphteria and pneumonia, metritis, foot root and septic mastitis in cattle with repeated dose 48 hors later sometimes required. Use of sulfabromomethazine during the last 3 months of pregnancy should be avoided. The compound is now rarely used.

Sulfalene (INN, USAN) or Sulfametopyrazine (BAN) is a long-acting sulfonamide antibiotic used for the treatment of chronic bronchitis, urinary tract infections, and malaria. Sulfametopyrazine, by virtue of a long half-life, achieves peak blood levels of 120 mkg/ml or more which fall to around 30-50 mkg/ml one week after a single oral dose of 2 g. Long-term administration of this drug in the treatment of leprosy for up to 3 years has been accomplished without serious unwanted effects

Sulfazamet is a sulfanilamide derivative that exhibits antibacterial activity against Streptococci sepsis

Sulfadoxine is an antimalarial agent which, together with pyrimethamine, composes an FDA-approved drug, Fansidar. Sulfadoxine acts by inhibiting dihydropteroate synthase; it crosses the blood-brain barrier and achieves 30% to 60% of the plasma concentration.

Sulfametoxydiazine (INN) or sulfamethoxydiazine (USAN: sulfameter) is a long-acting sulfonamide antibacterial, shows bacteriostatic effects against Gram positive and Gram negative bacteria in vivo. It is used as a leprostatic agent and in the treatment of urinary tract infections. Orally active. Sulfonamides block the synthesis of dihydrofolic acid by inhibiting the enzyme dihydropteroate synthase. Sulfonamides are competitive inhibitors of bacterial para-aminobenzoic acid (PABA), which is required for bacterial synthesis of folic acid. Sulfameter is a dihydrofolate reductase (DHFR) inhibitor. Mode of resistance is via the alteration of dihydropteroate synthase or alternative pathway for folic acid synthesis.

Sulfamethoxypyridazine is a sulfonamide antibacterial with a broad spector of activity. It acts by inhibiting the enzyme dihydropteroate synthetase (DHPS), required for the synthesis of nucleic acids and microbial cells.

Sulfaethidole is an antibacterial agent, indicated for the treatment of urinary tract infection.

Diethanolamine (DEA) is an amino alcohol commonly used in the preparation of soaps and surfactants, agricultural chemicals and in textile processing. DEA and DEA-Derivatives are used in other products besides cosmetics and personal care products. For example, DEA and DEA-derivatives have been approved for several food-related applications, primarily food packaging.

Sulfisoxazole is a sulfonamide antibacterial antibiotic. The sulfonamides are synthetic bacteriostatic antibiotics with a wide spectrum against most gram-positive and many gram-negative organisms. However, many strains of an individual species may be resistant. Sulfisoxazole acetyl in combination with erythromycin ethylsuccinate is used for treatment of ACUTE OTITIS MEDIA in children that is caused by susceptible strains of Haemophilus influenzae. Sulfisoxazole acetyl is a prodrug of sulfisoxazole. Acetyl group is added to make the drug poorly water soluble, and is hydrolyzed in vivo to the active drug. Sulfisoxazole and its acetylated metabolites are excreted primarily by the kidneys through glomerular filtration. Sulfisoxazole is a competitive inhibitor of the enzyme dihydropteroate synthetase. It inhibits bacterial synthesis of dihydrofolic acid by preventing the condensation of the pteridine with para-aminobenzoic acid (PABA), a substrate of the enzyme dihydropteroate synthetase. The inhibited reaction is necessary in these organisms for the synthesis of folic acid

Sulfamethazine is a sulfonamide used to treat a variety of bacterial diseases in animals. It inhibits bacterial synthesis of dihydrofolic acid by competing with para-aminobenzoic acid (PABA) for binding to dihydropteroate synthetase (dihydrofolate synthetase).