Clarithromycin is an antibiotic used to treat various bacterial infections, including respiratory tract infections, skin infections, and certain stomach ulcers caused by Helicobacter pylori. It belongs to a class of medications called macrolides, which work by inhibiting bacterial protein synthesis, effectively stopping the growth of bacteria. This medication is typically taken orally in the form of tablets or liquid. Common side effects may include nausea, diarrhea, and changes in taste. It is important to complete the full course of treatment as prescribed by a healthcare provider to ensure the infection is fully cleared and to prevent antibiotic resistance.