Methacycline is primarily used as an antibiotic in the treatment of various bacterial infections. It is effective against a wide range of bacteria, making it useful for treating respiratory tract infections, urinary tract infections, skin infections, and certain sexually transmitted diseases. Additionally, it is sometimes prescribed for acne vulgaris due to its ability to reduce inflammation and control bacterial growth on the skin. Methacycline is also employed in veterinary medicine to treat infections in animals. Its broad-spectrum activity and ability to penetrate tissues make it a versatile option in both human and animal healthcare.