Mechanism of Action
Ampicillin is a β-lactam antibiotic that works similarly to penicillin. It inhibits the final stage of bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs) on the bacterial cell wall. This prevents the cross-linking of peptidoglycan chains, leading to weakened cell walls and ultimately causing bacterial cell lysis and death. Additionally, ampicillin can activate autolytic enzymes in the bacterial cell wall, further promoting bacterial lysis.
Application
Ampicillin is a broad-spectrum antibiotic used to treat a variety of infections caused by susceptible bacteria, including:
- Respiratory Tract Infections: Such as pneumonia and bronchitis.
- Urinary Tract Infections: Caused by Escherichia coli, Proteus species, and others.
- Gastrointestinal Infections: Such as salmonellosis.
- Meningitis: Caused by Neisseria meningitidis.
- Soft Tissue Infections: Such as cellulitis.
- Endocarditis.
- Septicemia.
Dosage Instructions
The dosage of ampicillin varies depending on the type of infection and the patient's condition:
- Adults:Mild to Moderate Infections: 250 mg to 500 mg orally every 6 to 8 hours.Severe Infections: Up to 2 grams per day in divided doses.
- Children:Mild to Moderate Infections: 20 to 40 mg/kg per day in divided doses every 6 to 8 hours.Severe Infections: Up to 80 mg/kg per day in divided doses.
- Neonates:First Week of Life: 50 mg/kg per day in divided doses every 12 hours.After the First Week: 100 mg/kg per day in divided doses every 6 to 8 hours.
- Important Note: The dosage should be adjusted based on the severity of the infection and the patient's renal function. Patients with impaired renal function may require lower doses or longer dosing intervals.
Storage
Ampicillin should be stored in a cool, dry place, protected from light and moisture. Keep the container tightly closed to maintain the stability and efficacy of the medication. The recommended storage temperature is typically between 15°C and 30°C (59°F to 86°F).
