The Namoxin CV 625 LB is a penicillin-type of antibiotic that helps your body fight infections caused by bacteria. This medicine is widely used to treat infections of the lungs ear, nasal sinus, urinary tract, skin and soft tissue. It will not work for viral infections such as the common cold. The Namoxin CV 625 LB is best taken with a meal to reduce the chance of a stomach upset. You should always complete a full course of this antibiotic as prescribed by your doctor or else some bacteria may survive and the infection may come back or worsen.