Tetracyclines are a class of broad-spectrum antibiotics used to treat various bacterial infections. They work by inhibiting protein synthesis in bacteria, which prevents their growth and reproduction. Commonly prescribed tetracyclines include doxycycline and minocycline, effective against conditions like acne, respiratory infections, and certain sexually transmitted diseases. These antibiotics are generally taken orally and can be used in both adults and children, although their use in young children is limited due to potential effects on tooth development. It's important to complete the prescribed course to prevent antibiotic resistance and ensure the infection is fully treated.