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# Pantoprazole
## Overview
Pantoprazole is a proton pump inhibitor (PPI) that suppresses gastric acid secretion by inhibiting the H+/K+-ATPase enzyme system at the secretory surface of gastric parietal cells.
## 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:** 40 mg orally once daily for up to 8 weeks. For maintenance of healing, 40 mg orally once daily.
* **Pathological Hypersecretory Conditions (e.g., Zollinger-Ellison Syndrome):** Starting dose is typically 40 mg orally twice daily, but may be increased based on clinical response. Doses up to 240 mg daily (divided into two doses) have been administered.
## Pediatric Dosing
Dosing is not well-established in pediatric patients for all indications.
* **GERD (erosive esophagitis):** 1 mg/kg/day to 1.3 mg/kg/day orally once daily, not to exceed 40 mg/day. Duration of treatment is typically 4 weeks.
## Dose Adjustments
* **Hepatic Impairment:** Maximum daily dose of 40 mg orally.
* **Renal Impairment:** No dose adjustment necessary.
## Contraindications
* Known hypersensitivity to pantoprazole or any component of the formulation.
## Adverse Effects
Common adverse effects include headache, diarrhea, nausea, abdominal pain, and dizziness. Long-term use may be associated with an increased risk of fractures, Clostridium difficile infection, and vitamin B12 deficiency.
## Key Drug Interactions
* **Drugs requiring gastric acid for absorption:** Pantoprazole can decrease absorption of drugs such as ketoconazole, itraconazole, posaconazole, iron salts, and vitamin B12.
* **Methotrexate:** PPIs may increase levels of methotrexate.
* **CYP2C19 substrates:** Pantoprazole is a moderate inhibitor of CYP2C19. Caution advised with drugs primarily metabolized by CYP2C19 (e.g., clopidogrel, although clinical significance is debated).
## Monitoring
* Monitor for signs and symptoms of fracture, C. difficile infection, and vitamin B12 deficiency with prolonged use.
* Monitor electrolytes (e.g., magnesium) in patients on long-term therapy, especially with concomitant diuretic use.
## Clinical Pearls
* Pantoprazole is generally taken 30-60 minutes before a meal.
* IV formulation is available for patients unable to take oral medication.
* Consider the potential for rebound acid hypersecretion upon abrupt discontinuation. Tapering may be considered.
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**Disclaimer:** This information is for educational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment. Verify current prescribing information with the manufacturer's package insert or other relevant clinical resources.
