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# Pantoprazole ## Overview Pantoprazole is a proton pump inhibitor (PPI) that inhibits the gastric H+/K+-ATPase enzyme system, effectively suppressing basal and stimulated gastric acid secretion. It is available in oral (delayed-release tablets, suspension) and intravenous (IV) formulations. ## Primary Indications * Treatment of erosive esophagitis (associated with GERD). * Maintenance of healing in erosive esophagitis. * Pathological hypersecretory conditions (e.g., Zollinger-Ellison syndrome). * Prophylaxis of stress-related mucosal bleeding (off-label use of IV formulation in critical care). ## Adult Dosing * **GERD/Erosive Esophagitis:** 40 mg PO or IV once daily for up to 8 weeks. * **Maintenance of Healing:** 40 mg PO once daily. * **Hypersecretory Conditions:** Starting dose is 40 mg PO twice daily. Doses up to 240 mg/day have been utilized; titration is based on individual acid output. * **Stress Ulcer Prophylaxis:** Common protocol is 40 mg IV daily or twice daily (follow local institutional protocol). ## Pediatric Dosing * **Erosive Esophagitis (Children ≥5 years):** * 15 kg to <40 kg: 20 mg PO once daily for up to 8 weeks. * ≥40 kg: 40 mg PO once daily for up to 8 weeks. * **Note:** IV safety and efficacy not established in pediatric patients. ## Dose Adjustments * **Hepatic Impairment:** No specific dose adjustment defined for mild to moderate impairment, but clinical observation is recommended. Severe impairment may require dose reduction or increased monitoring. * **Renal Impairment:** No dosage adjustment necessary. ## Contraindications * Known hypersensitivity to pantoprazole or other substituted benzimidazoles (e.g., omeprazole, lansoprazole). * Concomitant use with rilpivirine-containing products. ## Adverse Effects * **Common:** Headache, diarrhea, nausea, abdominal pain, flatulence. * **Serious:** *Clostridioides difficile*-associated diarrhea (CDAD), hypomagnesemia, vitamin B12 deficiency (long-term use), acute interstitial nephritis, cutaneous/systemic lupus erythematosus, and bone fractures (hip, wrist, spine) with prolonged high-dose use. ## Key Drug Interactions * **CYP2C19/3A4:** Pantoprazole has a lower potential for CYP enzyme interactions compared to other PPIs, but exercise caution with drugs dependent on gastric pH for absorption (e.g., ketoconazole, atazanavir, mycophenolate mofetil). * **Methotrexate:** High-dose PPI therapy may increase serum levels of methotrexate. * **Warfarin:** Monitor INR/PT; some reports suggest potential interaction though inconsistent. ## Monitoring * Monitor for signs of hypomagnesemia (tremors, arrhythmias) if on long-term therapy or concomitant drugs like diuretics. * Observe for symptoms of *C. difficile* infection (persistent diarrhea). * Baseline and periodic monitoring of Vitamin B12 for patients on therapy >1 year. ## Clinical Pearls * **Administration:** Tablets should be swallowed whole; do not split, chew, or crush. * **Timing:** For oral formulations, best taken 30–60 minutes before a meal. * **IV Usage:** IV pantoprazole should be discontinued as soon as the patient can tolerate oral therapy. * **De-prescribing:** Always evaluate the necessity of long-term PPI therapy; avoid indefinite use without a valid indication to minimize risk of side effects. *** **Educational Disclaimer:** This information is for educational purposes only. Always consult current institutional protocols and the official FDA-approved prescribing information (package insert) before prescribing or administering medication.