Roxithromycin is widely used as an antibiotic to treat various bacterial infections. It is effective against respiratory tract infections, including bronchitis, pneumonia, and sinusitis. It is also prescribed for skin and soft tissue infections, such as cellulitis and impetigo. Additionally, it is used to treat urinary tract infections and certain sexually transmitted infections like chlamydia. Roxithromycin works by inhibiting bacterial protein synthesis, preventing the growth and spread of bacteria. It is often chosen for its broad-spectrum activity and relatively mild side effect profile compared to other antibiotics.