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# Pantoprazole
## Overview
Pantoprazole is a proton pump inhibitor (PPI) that suppresses gastric acid secretion.
## Primary Indications
* Gastroesophageal reflux disease (GERD) - erosive esophagitis healing and maintenance.
* Zollinger-Ellison syndrome.
* Part of *Helicobacter pylori* eradication regimens.
## Adult Dosing
* **Erosive esophagitis:** 40 mg orally or intravenously once daily for up to 8 weeks.
* **GERD (symptomatic relief):** 20 mg orally once daily. If inadequate symptom control after 4 weeks, consider therapy for up to another 4 weeks.
* **Maintenance of healing:** 40 mg orally once daily.
* **Zollinger-Ellison syndrome:** 40 mg orally or intravenously every 12 hours. Doses may be increased as clinically needed. Doses up to 240 mg daily (IV or oral) have been administered.
* ***H. pylori* eradication:** 40 mg orally twice daily (with amoxicillin 1 g twice daily and clarithromycin 500 mg twice daily) for 7-14 days.
## Pediatric Dosing
* **Erosive esophagitis (ages 5 to 16 years):** 20 mg orally once daily for up to 8 weeks. Dosing may be considered at 40 mg once daily for more severe disease.
* **GERD (ages 5 to 16 years):** 20 mg orally once daily for up to 8 weeks for symptomatic GERD. Dosing may be considered at 40 mg once daily.
* **Zollinger-Ellison syndrome (ages 12 to 16 years):** 40 mg orally twice daily.
## Dose Adjustments
No dose adjustment is generally required for hepatic or renal impairment. However, caution and appropriate monitoring are advised in severe hepatic impairment.
## Contraindications
* Hypersensitivity to pantoprazole or any component of the formulation.
## Adverse Effects
Common adverse effects include headache, diarrhea, nausea, abdominal pain, and dizziness. Long-term PPI use may be associated with an increased risk of:
* Fractures (hip, wrist, spine)
* Clostridium difficile infection
* Vitamin B12 deficiency
* Hypomagnesemia
* Fundic gland polyps
## Key Drug Interactions
* **Antiretrovirals:** Decreased absorption of drugs like rilpivirine, atazanavir, and nelfinavir due to increased gastric pH.
* **Methotrexate:** Increased serum levels of methotrexate may occur, potentially leading to toxicity.
* **CYP2C19 Substrates:** Pantoprazole is a moderate inhibitor of CYP2C19. Co-administration with substrates like clopidogrel may reduce their efficacy. However, the clinical significance is debated.
* **Iron supplements:** Decreased absorption due to increased gastric pH.
## Monitoring
* Monitor for magnesium levels, particularly in patients on long-term therapy or taking concomitant medications that can lower magnesium (e.g., diuretics).
* Monitor for signs and symptoms of *C. difficile*-associated diarrhea.
* Monitor for vitamin B12 deficiency with prolonged use.
## Clinical Pearls
* For intravenous administration, reconstitute the vial with 5 mL of 0.9% sodium chloride injection and then further dilute in 50 mL of 0.9% sodium chloride injection or 5% dextrose injection. Infuse over 15 minutes.
* Pantoprazole is typically taken 30-60 minutes before a meal.
* The 20 mg dose is available as a delayed-release orally disintegrating tablet.
* Consider the potential for drug interactions, especially with clopidogrel and certain antiretrovirals.
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**Disclaimer:** This information is intended for educational purposes and does not constitute medical advice. Always consult the most current prescribing information and guidelines or a qualified healthcare professional for patient-specific treatment decisions.
