Educational use only. Drug cards are AI-assisted study material for NCLEX preparation.
Proton pump inhibitors (omeprazole, pantoprazole, esomeprazole, lansoprazole)
Mechanism of action
Irreversibly inhibit the H+/K+ ATPase ("proton pump") on gastric parietal cells, suppressing basal and stimulated gastric acid secretion. Profound and prolonged acid suppression after a single dose. Used for GERD, peptic ulcer disease, H. pylori eradication (with antibiotics), Zollinger-Ellison syndrome, NSAID-induced ulcer prevention, and stress-ulcer prophylaxis in critical care.
Adverse effects
Life-threatening / NCLEX-tested
- Increased risk of C. difficile colitis
- Community-acquired pneumonia (modest signal)
- Hip and vertebral fracture with long-term use (calcium absorption interference)
- Hypomagnesemia with long-term use → tetany, arrhythmias, seizures
- Vitamin B12 deficiency with long-term use
- Acute interstitial nephritis → AKI
- Severe hypersensitivity reactions including SJS/TEN (rare)
- Rebound hypersecretion after abrupt discontinuation
Side effects
Common — what to teach
- Headache
- GI upset, nausea, diarrhea, abdominal pain
- Dizziness
- Vitamin B12, magnesium, and calcium absorption issues with chronic use
- Mild flatulence
Food & drug interactions
Omeprazole and esomeprazole are strong CYP2C19 inhibitors — REDUCE CLOPIDOGREL ACTIVATION (antiplatelet effect drops); pantoprazole is preferred when a PPI is needed in patients on clopidogrel. PPIs reduce absorption of drugs requiring acid (atazanavir, ketoconazole, iron, calcium carbonate). May increase digoxin levels by raising gastric pH. Long-term use lowers magnesium, B12, and calcium.
Nursing implications
Assessment, monitoring, patient teaching
- Take 30–60 minutes BEFORE the first meal of the day — proton pumps are activated by food, so the drug works best when active pumps are available to bind
- Capsules can be opened and contents sprinkled on applesauce for swallow-impaired patients (do not crush or chew the granules — they are enteric-coated)
- If patient is on clopidogrel and needs a PPI, recommend PANTOPRAZOLE (less CYP2C19 interaction)
- For long-term use: monitor magnesium, B12, and calcium periodically; review the indication at least yearly — many patients can step down to H2 blocker or stop
- Counsel against indefinite OTC use without medical review
- Teach to report severe diarrhea (C. diff), muscle cramps/tetany (hypomagnesemia), or new fatigue/anemia (B12)
- For H. pylori eradication: stress adherence to the full 10–14 day combination regimen
When to hold / contraindications
- Suspected acute interstitial nephritis with rising creatinine
- Severe hypomagnesemia with neuromuscular or cardiac symptoms (correct first)
- Active C. difficile infection — review the indication
- Severe rash, fever, mucosal involvement (suspected SJS/TEN)
- Long-term unjustified use — re-evaluate the indication and step down where appropriate
Memory anchor
PPIs end in "-prazole." Take 30–60 min before breakfast. Long-term: low magnesium, low B12, low calcium, more C. diff. Pantoprazole is the PPI of choice with clopidogrel.
Practice Proton questions
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