Cimetidine Dosage and Administration in Children

Introduction to Cimetidine

• The American Academy of Pediatrics recommends cimetidine at 30-40 mg/kg/day divided into 4 doses for pediatric patients with gastroesophageal reflux disease (GERD) and other acid-related conditions 1
• Cimetidine is available as a syrup formulation, making administration easier for pediatric patients, although the FDA has only approved it for use in children 16 years and older 1

Pharmacokinetics and Pharmacodynamics

• The acid-inhibiting effects of H2 receptor antagonists like cimetidine last for approximately 6 hours, making the four-times-daily dosing schedule appropriate 1
• Gastric pH begins to increase within 30 minutes of administration, with peak plasma concentration reached approximately 2.5 hours after dosing 1

Efficacy and Safety

• Proton pump inhibitors (PPIs) have been shown to be more effective than H2 receptor antagonists like cimetidine for symptom relief and healing of erosive esophagitis 1

Potential Issues and Considerations

• Tachyphylaxis can develop within 6 weeks of treatment initiation, limiting long-term use 1
• Cimetidine may cause side effects, including gynecomastia and liver dysfunction 1