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## Pantoprazole
### Overview
Pantoprazole is a proton pump inhibitor (PPI) that reduces gastric acid production.
### Primary Indications
* Erosive esophagitis associated with gastroesophageal reflux disease (GERD)
* Healing of erosive esophagitis
* Pathological hypersecretory conditions (e.g., Zollinger-Ellison syndrome)
* Maintenance of healing of erosive esophagitis
* H. pylori eradication (in combination with antibiotics)
### Adult Dosing
* **Erosive esophagitis:** 40 mg orally or intravenously once daily for up to 8 weeks.
* **Healing of erosive esophagitis:** 40 mg orally or intravenously once daily. Some patients may be treated for up to 16 weeks.
* **Maintenance of healing of erosive esophagitis:** 40 mg orally once daily.
* **Pathological hypersecretory conditions:** Starting dose is typically 40 mg orally or intravenously twice daily. Doses may be increased as needed. Doses up to 240 mg daily have been administered.
* **H. pylori eradication:** 40 mg orally twice daily for 7-14 days in combination with specific antibiotic regimens.
### Pediatric Dosing
Dosing in pediatric patients varies by age and indication. Consult specific pediatric guidelines.
* **Erosive esophagitis (12 years and older):** 40 mg orally once daily for up to 8 weeks.
* **Erosive esophagitis (5-11 years):** 20 mg orally once daily for up to 8 weeks.
### Dose Adjustments
* **Hepatic Impairment:** Maximum dose of 20 mg orally once daily. No dose adjustment needed for IV administration.
* **Renal Impairment:** No dose adjustment is typically necessary.
### Contraindications
* Known hypersensitivity to pantoprazole, substituted benzimidazoles, or any component of the formulation.
### Adverse Effects
* Common: Headache, diarrhea, nausea, abdominal pain, vomiting, dizziness, flatulence, arthralgia.
* Serious: *Clostridium difficile*-associated diarrhea, bone fractures (hip, wrist, spine), vitamin B12 deficiency, hypomagnesemia, lupus erythematosus (cutaneous and systemic), fundic gland polyps. Long-term use may be associated with increased risk of pneumonia.
### Key Drug Interactions
* **Drugs requiring gastric acid for absorption:** Ketoconazole, itraconazole, posaconazole, iron salts, cyanocobalamin, mycophenolate mofetil. Pantoprazole can decrease absorption.
* **Methotrexate:** PPIs may increase methotrexate levels, potentially leading to toxicity.
* **CYP2C19 Substrates:** Pantoprazole may affect the metabolism of drugs metabolized by CYP2C19 (e.g., clopidogrel, citalopram, diazepam).
### Monitoring
* Monitor for signs and symptoms of *C. difficile*-associated diarrhea.
* Consider monitoring serum magnesium levels, especially with prolonged use (typically > 1 year) or concomitant use of other drugs that can lower magnesium (e.g., diuretics).
* Monitor for signs and symptoms of bone fractures.
* Assess for vitamin B12 deficiency with prolonged therapy.
### Clinical Pearls
* Pantoprazole is often administered 30-60 minutes before a meal.
* For IV administration, reconstitute and dilute as per manufacturer instructions.
* Ensure adequate diagnosis of GERD or erosive esophagitis before initiating long-term PPI therapy.
* Consider the lowest effective dose for the shortest duration necessary to manage the condition.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines for complete details and to verify patient-specific appropriateness.*
