KLARICID XL is a brand name for the antibiotic clarithromycin in an extended-release formulation. It belongs to a class of medications known as macrolide antibiotics and is used to treat a wide range of bacterial infections, including respiratory tract infections, skin infections, and more. The "XL" in its name indicates that it is designed to release the drug slowly into the body over an extended period, allowing for once-daily dosing. Clarithromycin works by stopping the growth of bacteria, helping the body to fight off the infection. It is important to note that KLARICID XL is effective only against bacterial infections and will not work for viral infections such as the common cold or flu. As with any antibiotic, it is crucial to take KLARICID XL exactly as prescribed by a healthcare professional to ensure its effectiveness and to help prevent antibiotic resistance.