Used primarily as an intestinal antiseptic, it acts against bacterial infections in the gastrointestinal tract. Due to its limited absorption in the gut, it maintains high concentrations in the intestines, making it effective for bowel sterilization before surgical procedures. It has been used in the treatment of dysentery and other enteric infections caused by susceptible organisms. Its action is enhanced when combined with other sulfonamides, providing a synergistic effect in controlling intestinal flora.