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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 in 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 4 to 8 weeks. For maintenance, 40 mg once daily.
* **Pathological hypersecretory conditions:** Starting dose is typically 40 mg orally twice daily, but may be increased based on clinical response. Doses up to 240 mg daily have been administered.
## Pediatric Dosing
* **GERD (erosive esophagitis):**
* 1 year and older: 20 mg orally once daily for up to 8 weeks.
* Dosing may be weight-based for certain formulations or indications, consult specific product labeling.
## Dose Adjustments
* **Hepatic Impairment:** Maximum dose of 40 mg once daily.
* **Renal Impairment:** No dose adjustment generally needed.
## Contraindications
* Known hypersensitivity to pantoprazole, any component of the formulation, or other substituted benzimidazoles.
## Adverse Effects
* **Common:** Headache, diarrhea, nausea, abdominal pain, flatulence, vomiting, dizziness, arthralgia.
* **Serious:** Clostridium difficile-associated diarrhea, bone fractures (hip, wrist, spine), hypomagnesemia, fundic gland polyps, lupus erythematosus, vitamin B12 deficiency.
## Key Drug Interactions
* **Drugs requiring gastric acid for absorption:** Ketoconazole, itraconazole, posaconazole, iron salts, and certain HIV protease inhibitors (e.g., atazanavir, nelfinavir). Pantoprazole can decrease absorption.
* **Methotrexate:** PPIs may increase methotrexate levels.
* **CYP2C19 substrates:** Pantoprazole can inhibit CYP2C19, potentially affecting metabolism of drugs like clopidogrel.
## Monitoring
* Monitor for signs and symptoms of hypomagnesemia (e.g., muscle cramps, seizures, arrhythmias).
* Monitor for signs of Clostridium difficile infection.
* Consider monitoring magnesium levels in patients on long-term therapy, especially those taking concomitant medications like digoxin or diuretics.
* Monitor for bone fracture risk factors.
## Clinical Pearls
* Administer pantoprazole 30 minutes before a meal.
* Do not crush or chew delayed-release tablets.
* Long-term PPI use is associated with increased risk of C. difficile infection, bone fractures, and vitamin B12 deficiency.
* Consider tapering PPIs when discontinuing to avoid rebound acid hypersecretion.
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*This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and your healthcare provider for any medical advice, diagnosis, or treatment.*
