Optimal Timing of Famotidine Administration

Pharmacokinetic Considerations

• Famotidine's acid-inhibiting effects last for approximately 6 hours, making twice-daily dosing effective for maintaining acid suppression throughout the day, with gastric pH beginning to increase within 30 minutes of administration and reaching peak plasma concentrations 2.5 hours after dosing 1

Special Considerations

• The American College of Cardiology recommends famotidine over proton pump inhibitors for patients on dual antiplatelet therapy, as there is no evidence that H2 blockers interfere with the antiplatelet activity of clopidogrel 2, 3, 4
• For patients requiring nighttime acid suppression, famotidine before bedtime is particularly effective at controlling nocturnal acid breakthrough, although tachyphylaxis can develop within 6 weeks of initiating H2 receptor antagonist therapy 5, 1