Rifamax 200 mg Tablet is an antibiotic medication manufactured by Incepta Pharmaceuticals Ltd. Its active ingredient is Rifaximin, a semisynthetic, rifamycin-based antibiotic that exhibits broad-spectrum bactericidal activity against various Gram-positive and Gram-negative bacteria. Rifaximin works by inhibiting bacterial RNA synthesis through its action on the beta-subunit of the DNA-dependent RNA polymerase. Due to its minimal systemic absorption, Rifaximin primarily acts locally within the gastrointestinal tract, making it effective for treating conditions like traveler's diarrhea, irritable bowel syndrome with diarrhea (IBS-D), and reducing the risk of overt hepatic encephalopathy.