Tetracycline is a broad-spectrum antibiotic that is used to treat various bacterial infections. It works by inhibiting the growth of bacteria, making it effective against conditions like acne, respiratory infections, and urinary tract infections. Tetracycline is available in oral and topical forms. This antibiotic belongs to the tetracycline class of antibiotics, which also includes doxycycline and minocycline. It is important to take tetracycline as prescribed, as misuse can lead to antibiotic resistance. Common side effects may include nausea, diarrhea, and sensitivity to sunlight.