Ampicillin is a type of antibiotic that belongs to the penicillin group. It is used to treat various bacterial infections, including those affecting the respiratory tract, urinary tract, and skin. Ampicillin works by stopping the growth of bacteria, helping the body to fight off infections. This medication can be taken orally or given through an injection, depending on the severity of the infection. Common side effects may include nausea, diarrhea, and allergic reactions. It is important to complete the full course of treatment as prescribed by a healthcare provider to ensure the infection is fully cleared.