Proton pump inhibitors (PPIs) such as omeprazole are prodrugs that require an acidic environment for activation. This means they must be:

• A Taken before meals on an empty stomach to coincide with proton pump activation by meal-stimulated acid secretion ✓
• B Taken with food to slow gastric emptying and prolong drug-acid contact time
• C Taken at bedtime to suppress nocturnal acid secretion by accumulated drug
• D Dissolved in alkaline solution before administration to prevent premature acid activation

Explanation

PPIs are weak bases that accumulate in the acidic secretory canaliculus of the parietal cell, where they are protonated and converted to sulfenamide — the active form that covalently binds H+/K+-ATPase. For maximum effect, PPIs must be taken 30–60 minutes before the first meal, as eating stimulates the parietal cell proton pumps that are required to activate the prodrug; pumps in resting parietal cells are not accessible. Taking with food or at bedtime reduces efficacy.

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

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Written and medically reviewed by the StethoPrep medical team.