Erythromycin is widely used as an antibiotic to treat various bacterial infections. It is effective against respiratory tract infections, such as pneumonia and bronchitis, as well as skin infections like acne and cellulitis. Additionally, it is used to treat sexually transmitted infections, including chlamydia and syphilis. In some cases, it is prescribed to prevent infections before surgeries or dental procedures for patients with heart conditions. Erythromycin is also utilized in veterinary medicine to treat bacterial infections in animals. Its broad-spectrum activity makes it a versatile option in both human and animal healthcare.