Used primarily as an intestinal antiseptic, it treats acute diarrhea caused by susceptible bacteria in the gastrointestinal tract. It works by inhibiting bacterial metabolism through disruption of energy production in microbial cells. Commonly prescribed for mild to moderate infectious diarrhea, it helps reduce symptoms without significantly affecting normal gut flora. Due to limited systemic absorption, it acts locally in the intestines, minimizing side effects and making it suitable for short-term oral treatment.