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# Pantoprazole
## Overview
Pantoprazole is a proton pump inhibitor (PPI) that decreases gastric acid production.
## 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 or intravenously once daily for up to 8 weeks.
* **Maintenance of Healing:** 40 mg orally once daily. For patients with a history of recurrence, 20 mg orally once daily may be used.
* **Pathological Hypersecretory Conditions (e.g., Zollinger-Ellison Syndrome):** Initially 40 mg orally or intravenously once daily. Dosing should be adjusted based on gastric acid output. Usual doses range from 40 mg to 80 mg daily. Doses above 80 mg should be divided and administered every 12 hours.
## Pediatric Dosing
* **Erosive Esophagitis (12 years and older):** 40 mg orally once daily for 4 to 8 weeks.
* **Erosive Esophagitis (5 to 11 years):** 20 mg orally once daily for 4 to 8 weeks.
* *Dosing for younger children or other indications in pediatrics is not well-established and may require specialist consultation.*
## Dose Adjustments
* **Hepatic Impairment:** Maximum dose of 40 mg orally once daily.
* **Renal Impairment:** No dose adjustment is generally needed.
## 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 of PPIs may be associated with an increased risk of *Clostridium difficile*-associated diarrhea, bone fractures (hip, wrist, spine), and vitamin B12 deficiency.
## Key Drug Interactions
* **Drugs Dependent on Gastric pH for Absorption:** Pantoprazole can decrease absorption of drugs that require an acidic gastric pH, such as ketoconazole, itraconazole, and certain HIV protease inhibitors.
* **Methotrexate:** PPIs may increase methotrexate levels.
* **CYP2C19 Substrates:** Pantoprazole may affect the metabolism of drugs like clopidogrel, though the clinical significance is debated.
## Monitoring
* Monitor for signs and symptoms of fracture risk (e.g., bone pain) with long-term therapy.
* Monitor for signs of *Clostridium difficile* infection.
* Consider monitoring vitamin B12 levels in patients on long-term therapy.
## Clinical Pearls
* Administer oral pantoprazole 30 minutes before a meal.
* Intravenous pantoprazole is a potential alternative for patients unable to take oral medications.
* Avoid concomitant use with St. John's Wort or rifampin.
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**Disclaimer:** This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and relevant clinical guidelines for definitive patient management decisions.
