Pipemidic acid trihydrate is primarily used as an antibacterial agent, particularly effective against Gram-negative bacteria. It is commonly prescribed for treating urinary tract infections (UTIs), including cystitis and pyelonephritis, due to its ability to concentrate in the urine and target bacterial growth. Additionally, it is utilized in managing gastrointestinal infections caused by susceptible organisms. The compound works by inhibiting bacterial DNA gyrase, preventing DNA replication and thus stopping bacterial proliferation. Its use is generally limited to specific infections where it demonstrates high efficacy, and it is often considered when other antibiotics are less effective or unsuitable.