Maclacin is a brand name for the antibiotic medication clarithromycin, which is used to treat a variety of bacterial infections such as respiratory tract infections, skin and soft tissue infections, and stomach ulcers. It works by stopping the growth and spread of bacteria in the body. It belongs to a class of drugs known as macrolide antibiotics. Maclacin 500mg tablets are usually taken orally with or without food, and the dosage and duration of treatment depend on the type and severity of the infection being treated. It is important to finish the full course of treatment as prescribed by the doctor, even if the symptoms improve before the medication is finished.