Used to treat a wide range of bacterial infections, including respiratory tract infections, urinary tract infections, acne, and certain sexually transmitted diseases. Commonly prescribed in both human and veterinary medicine. Effective against gram-positive and gram-negative bacteria, as well as some atypical pathogens like chlamydia and rickettsia. Often used in agriculture to promote growth in livestock and control bacterial infections in aquaculture. Also applied in research settings for inducing gene expression in antibiotic-regulated expression systems.