Proton pump inhibitors (PPIs) require specific dosing recommendations for maximum efficacy. The correct guidance regarding PPI administration is:

• A They should be taken 30–60 minutes before the first meal of the day to allow absorption before parietal cells are activated by food, maximizing irreversible H+/K+-ATPase binding ✓
• B They should be taken with food to increase gastric acid secretion and activate the prodrug
• C Administration at bedtime is preferred as they achieve maximal acid suppression overnight
• D They can be taken at any time as they are not prodrugs and have immediate action

Explanation

PPIs are prodrugs (weak bases) that are absorbed systemically, concentrate in the acidic canalicular space of active parietal cells, and are protonated to their active sulphenamide form, which covalently and irreversibly binds cysteine residues of the active H+/K+-ATPase proton pump. Parietal cells actively secrete acid primarily in response to a meal stimulus. Taking a PPI 30–60 minutes before the first meal ensures peak plasma PPI levels coincide with maximal recruitment of active (acid-secreting) proton pumps, maximizing the proportion of pumps inhibited. Administration at bedtime is less effective because fewer pumps are active during sleep.

Reference: KD Tripathi, Essentials of Medical Pharmacology, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.