Clarithromycin belongs to a clinical class of antibiotics, which are macrolides. It is mainly used clinically for Gram-positive bacterial infections, such as upper respiratory tract infections and bronchitis and bronchiectasis. Clarithromycin dispersible tablets can be pressed into powder form because the texture is in the form of dispersion, and then suitable for children. It is usually taken by adults as 1 capsule, 250 p.p., twice a day. There are also specific uses for specific diseases, for example, sinusitis can be used in small doses, 1 time a day. Clarithromycin is mainly metabolized by the liver, so it is not usually used simultaneously with other drugs, such as anti-mycotics and anti-allergy drugs. The reactions to clarithromycin are mainly gastrointestinal and less severe than those to erythromycin.