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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
* Gastroesophageal reflux disease (GERD)
* Erosive esophagitis
* Pathological hypersecretory conditions (e.g., Zollinger-Ellison syndrome)
* Healing of duodenal ulcers
* H. pylori eradication (in combination therapy)
## Adult Dosing
* **GERD/Erosive Esophagitis:** 20 mg to 40 mg orally or intravenously once daily. Max dose: 40 mg daily for GERD, 40 mg daily for erosive esophagitis.
* **Pathological Hypersecretory Conditions:** Starting dose: 40 mg orally or intravenously once daily. Titrate as needed. Doses up to 240 mg daily have been administered intravenously in divided doses. Max oral dose: 240 mg daily.
* **Duodenal Ulcer Healing:** 40 mg orally once daily.
* **H. pylori Eradication:** Typically 40 mg orally twice daily for 7 to 14 days, in combination with antibiotics.
## Pediatric Dosing
* **GERD (age 5 to 16 years):** 20 mg orally once daily. For severe erosive esophagitis, 40 mg orally once daily may be considered.
* **GERD (age 6 months to 5 years):** Dosing is variable and depends on weight and indication. Consult specific pediatric guidelines. Typical doses range from 1 mg/kg/day to 2.5 mg/kg/day, divided once or twice daily. Max dose typically 40 mg daily.
## Dose Adjustments
* **Hepatic Impairment:** Reduce daily dose by half (e.g., 20 mg once daily).
## Contraindications
* Known hypersensitivity to pantoprazole or any component of the formulation.
## Adverse Effects
* **Common:** Headache, diarrhea, nausea, dizziness, abdominal pain, flatulence.
* **Serious:** *Clostridium difficile*-associated diarrhea, bone fractures (hip, wrist, spine) with prolonged use, hypomagnesemia (symptomatic or asymptomatic), vitamin B12 deficiency, potential increased risk of certain infections (e.g., pneumonia).
## Key Drug Interactions
* **Drugs requiring gastric acid for absorption:** Ketoconazole, itraconazole, iron salts, mycophenolate mofetil. Separate administration by at least 2 hours.
* **Methotrexate:** PPIs may increase methotrexate levels. Consider holding pantoprazole during methotrexate treatment.
* **CYP2C19 substrates:** May alter metabolism of drugs like clopidogrel (though clinical significance is debated).
## Monitoring
* Monitor for signs and symptoms of *C. difficile* infection.
* Consider monitoring serum magnesium levels with long-term therapy, especially in patients taking concomitant diuretics or digoxin.
* Monitor for signs of bone fractures.
* Assess for vitamin B12 deficiency with prolonged use.
## Clinical Pearls
* Administer oral pantoprazole 30 to 60 minutes before a meal.
* Delayed-release formulations are enteric-coated and should not be crushed or chewed.
* For intravenous administration, reconstitute and further dilute as per manufacturer instructions.
* While generally well-tolerated, long-term PPI use is associated with potential risks that should be discussed with patients.
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*This information is intended for clinical use and does not substitute for professional medical advice. Always verify current prescribing information and consult relevant guidelines or drug references before making treatment decisions.*
