Clarithromycin 250 mg is an antibiotic belonging to the macrolide class, effective against a broad spectrum of bacterial infections. It functions by inhibiting bacterial protein synthesis through binding to the 50S ribosomal subunit, thereby preventing bacterial growth. This medication is commonly prescribed for respiratory tract infections (such as pneumonia and bronchitis), skin and soft tissue infections, and as part of combination therapy for Helicobacter pylori eradication in peptic ulcer disease. Clarithromycin is generally well-tolerated but may cause side effects like gastrointestinal disturbances, headache, and taste alterations. It is essential to complete the full prescribed course to prevent antibiotic resistance. Patients should consult their healthcare provider before use, especially if they have liver or kidney conditions, or are pregnant or breastfeeding.