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## Pantoprazole
### Overview
Pantoprazole is a proton pump inhibitor (PPI) that reduces 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. A subsequent 8-week course may be considered for patients who have not healed.
* **Maintenance of Healing:** 40 mg orally once daily.
* **Pathological Hypersecretory Conditions (e.g., Zollinger-Ellison Syndrome):** Initial dose of 40 mg orally or intravenously twice daily. Doses can be adjusted based on the degree of acid reduction. Usual doses range from 40 mg to 240 mg daily. Doses exceeding 120 mg daily should be divided and administered every 12 hours.
### Pediatric Dosing
* **12 years and older:**
* **Erosive Esophagitis:** 40 mg orally once daily for up to 8 weeks.
* **GERD Symptoms:** 20 mg orally once daily for up to 8 weeks.
### Dose Adjustments
* **Hepatic Impairment:** Maximum dose of 40 mg orally once daily. Intravenous administration is not recommended.
* **Renal Impairment:** No dose adjustment required.
### Contraindications
* Known hypersensitivity to pantoprazole, substituted benzimidazoles, or any component of the formulation.
### Adverse Effects
* **Common:** Headache, diarrhea, nausea, abdominal pain, dizziness, flatulence.
* **Serious:** *Clostridium difficile*-associated diarrhea, bone fractures (hip, wrist, spine), hypomagnesemia (potentially severe), vitamin B12 deficiency, lupus erythematosus cutaneus subacutus.
### Key Drug Interactions
* **Drugs requiring gastric pH for absorption:** Absorption may be decreased (e.g., ketoconazole, itraconazole, certain HIV protease inhibitors).
* **Methotrexate:** May increase methotrexate levels, potentially leading to toxicity.
* **CYP2C19 substrates:** May affect metabolism of drugs like clopidogrel.
### Monitoring
* Magnesium levels, especially in patients on long-term therapy or concomitant medications known to cause hypomagnesemia (e.g., diuretics).
* Bone mineral density in patients at risk for osteoporosis.
* Vitamin B12 levels with long-term use.
* Renal function and electrolytes in patients receiving IV pantoprazole.
### Clinical Pearls
* Pantoprazole is generally longer-acting than omeprazole.
* Administer oral pantoprazole 30 minutes before a meal.
* Do not crush or chew delayed-release tablets; they should be swallowed whole or dispersed in applesauce or a comparable medium.
* Long-term PPI use is associated with increased risk of bone fractures, C. difficile infection, and hypomagnesemia. Consider the risks versus benefits for long-term therapy.
* IV pantoprazole is indicated for patients unable to take oral medications.
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**Disclaimer:** This information is intended for clinical use and does not replace professional medical advice. Always consult the most current prescribing information and guidelines for definitive patient management decisions.
