The difference between Clindamycin Hydrochloride and Clarithromycin lies in the different classes of antibiotics, the different adverse reactions, and the different types of diseases treated. 1. Different antibiotic categories: Clindamycin hydrochloride is a lincomycin antibiotic, while clarithromycin is a macrolide antibiotic. 2. Different adverse reactions: Clindamycin Hydrochloride capsules are prone to acute renal impairment and hematuria, while Clarithromycin capsules usually have side effects such as nausea, heartburn, abdominal pain, diarrhea and headache. 3. Different kinds of treatment diseases: Clindamycin Hydrochloride Capsules are mainly used for the treatment of abdominal infections and gynecological infections caused by mycobacteria, while Clarithromycin Capsules are mainly used for the treatment of lower respiratory tract infections, such as bronchitis and pneumonia caused by bacterial infections. Patients are advised to use the drugs under the guidance of a doctor and not on their own. Patients who are allergic to the components of the drug are prohibited from taking it.