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# Pantoprazole ## Overview Pantoprazole is a proton pump inhibitor (PPI) that inhibits the gastric H+/K+-ATPase enzyme system. It is available in oral (delayed-release tablets, suspension) and intravenous (IV) formulations. ## Primary Indications * Treatment of erosive esophagitis associated with gastroesophageal reflux disease (GERD). * Maintenance of healing of erosive esophagitis. * Pathological hypersecretory conditions including Zollinger-Ellison (ZE) syndrome. * Short-term treatment of GERD symptoms in pediatric populations (5 years and older). ## Adult Dosing * **Erosive Esophagitis:** 40 mg orally or IV once daily for up to 8 weeks. * **GERD Maintenance:** 40 mg orally once daily. * **Hypersecretory Conditions (e.g., ZE Syndrome):** Initial dose 40 mg twice daily. Doses up to 240 mg daily have been used; adjust based on gastric acid output. * **IV Bolus:** 40 mg dose should be administered over at least 15 minutes. 80 mg dose should be administered over at least 15 minutes. ## Pediatric Dosing * **GERD (5 years and older):** * 15 kg to <40 kg: 20 mg once daily for up to 8 weeks. * 40 kg or greater: 40 mg once daily for up to 8 weeks. * **Note:** Pediatric dosing for hypersecretory conditions is generally extrapolated from adult data and requires specialist consultation. ## Dose Adjustments * **Hepatic Impairment:** Reduce frequency; usually 40 mg every other day in severe impairment (Child-Pugh C). No specific dose adjustment is required for mild to moderate impairment. * **Renal Impairment:** No dosage adjustment necessary. * **Geriatric:** No dosage adjustment necessary. ## Contraindications * Known hypersensitivity to pantoprazole or any substituted benzimidazole (e.g., omeprazole, lansoprazole). * Concomitant use with rilpivirine-containing products. ## Adverse Effects * **Common:** Headache, diarrhea, nausea, abdominal pain, flatulence. * **Serious:** *Clostridioides difficile*-associated diarrhea, hypomagnesemia, vitamin B12 deficiency (with long-term use), acute interstitial nephritis, cutaneous/systemic lupus erythematosus, and increased risk of bone fractures. ## Key Drug Interactions * **pH-Dependent Absorption:** May decrease absorption of drugs like atazanavir, nelfinavir, and ketoconazole. Avoid coadministration. * **Methotrexate:** PPIs may increase methotrexate levels; monitor levels closely, especially in high-dose therapy. * **Clopidogrel:** Potential reduced antiplatelet effect; clinical significance is debated, but consider alternative acid suppression if high CV risk. ## Monitoring * Monitor for signs of hypomagnesemia (e.g., palpitations, tremors) during prolonged therapy. * Monitor for symptom resolution and potential transition to "as needed" or lower-dose therapy. * Baseline and periodic magnesium and B12 levels if utilized long-term (>1 year). ## Clinical Pearls * **Administration:** Oral delayed-release tablets should be swallowed whole; do not crush or chew. * **Timing:** Administer 30–60 minutes before a meal for optimal efficacy. * **Deprescribing:** Use the lowest effective dose for the shortest duration. Tapering may be necessary to avoid rebound hypersecretion upon discontinuation. * **IV vs ORAL:** Switch to oral therapy as soon as the patient can tolerate it. IV pantoprazole is often overutilized; limit use to patients who cannot take medication orally (e.g., NPO status, severe dysphagia). *** **Educational Disclaimer:** This summary is for informational purposes only and does not constitute medical advice. Clinical practice protocols may vary significantly by institution. Verify all dosages, contraindications, and drug interactions against current prescribing information (e.g., FDA labels, package inserts, or clinical decision support software) before prescribing or administering medication.