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## Pantoprazole
### Overview
Pantoprazole is a proton pump inhibitor (PPI) that decreases the amount of acid produced in the stomach.
### Primary Indications
* Healing of erosive esophagitis associated with gastroesophageal reflux disease (GERD).
* Maintenance of healing of erosive esophagitis.
* Treatment of pathological hypersecretory conditions, including Zollinger-Ellison syndrome.
### Adult Dosing
* **Erosive Esophagitis (Healing):** 40 mg orally or intravenously once daily for up to 8 weeks.
* **Erosive Esophagitis (Maintenance):** 40 mg orally once daily.
* **Pathological Hypersecretory Conditions:** 40 mg orally or intravenously once daily. The dose should be titrated based on gastric acid output. Typical doses range from 40 mg to 120 mg daily. Doses above 80 mg should be administered intravenously in two divided doses.
### Pediatric Dosing
* **GERD (12 years and older):** 40 mg orally once daily for up to 8 weeks for healing of erosive esophagitis.
### Dose Adjustments
* **Hepatic Impairment:** Maximum daily dose of 40 mg orally once daily. No dose adjustment is necessary for renal impairment.
### Contraindications
* Known hypersensitivity to pantoprazole or any component of the formulation.
### Adverse Effects
* **Common:** Headache, diarrhea, nausea, abdominal pain, dizziness, flatulence.
* **Serious:** *Clostridium difficile*-associated diarrhea, bone fractures (hip, wrist, spine) with prolonged use, hypomagnesemia (can be severe and may lead to serious adverse events like seizures, tetany, muscle weakness, and cardiac arrhythmias), vitamin B12 deficiency, lupus erythematosus.
### Key Drug Interactions
* **Drugs Dependent on Gastric pH for Absorption:** May decrease absorption of drugs such as ketoconazole, itraconazole, erlotinib, and mycophenolate mofetil.
* **Methotrexate:** PPIs may increase methotrexate levels, potentially leading to toxicity.
* **CYP2C19 Substrates:** Pantoprazole is a moderate inhibitor of CYP2C19. Consider potential for increased concentrations of drugs metabolized by this enzyme (e.g., clopidogrel, though clinical significance is debated).
### Monitoring
* Monitor for signs and symptoms of *C. difficile*-associated diarrhea.
* Monitor serum magnesium levels, especially in patients receiving long-term therapy or concomitant diuretic use.
* Consider monitoring vitamin B12 levels in patients with prolonged therapy.
* Monitor bone mineral density in patients at risk for osteoporosis.
### Clinical Pearls
* Pantoprazole is generally taken 30-60 minutes before a meal.
* Intravenous administration may be used when oral administration is not feasible.
* Long-term PPI use has been associated with increased risk of fractures, *C. difficile* infection, and vitamin B12 deficiency. Use the lowest effective dose for the shortest duration necessary.
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*This information is intended for healthcare professionals and does not substitute for comprehensive prescribing information. Always consult the most current official prescribing information and relevant guidelines before making clinical decisions.*
