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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, symptomatic GERD
* Zollinger-Ellison syndrome
* Duoenlal and gastric ulcer treatment and healing (often in combination with antibiotics for H. pylori eradication)
* Prevention of NSAID-induced gastric ulcers
## Adult Dosing
* **GERD (Erosive Esophagitis Healing):** 40 mg orally or intravenously once daily for up to 8 weeks.
* **GERD (Maintenance):** 40 mg orally once daily. Some patients may be managed on 20 mg orally once daily.
* **Symptomatic GERD:** 20 mg orally once daily. If symptoms are not controlled after 4 weeks, consider treatment for up to another 4 weeks.
* **Zollinger-Ellison Syndrome:** 40 mg orally or intravenously twice daily. Doses may be adjusted based on clinical response; doses up to 240 mg daily have been administered intravenously.
* **H. pylori Eradication (Triple Therapy):** 40 mg orally twice daily for 7-14 days in combination with clarithromycin and amoxicillin or metronidazole.
* **NSAID-Induced Ulcers (Prevention):** 20 mg orally once daily.
## Pediatric Dosing
* **GERD (Erosive Esophagitis Healing):**
* 1 year to less than 5 years: 10 mg orally once daily for up to 8 weeks.
* 5 years to 16 years: 20 mg orally once daily for up to 8 weeks.
* Dosing for H. pylori eradication in pediatrics is not well-established.
## Dose Adjustments
* **Hepatic Impairment:** Maximum oral dose of 20 mg daily for patients with severe hepatic impairment. IV dosing should also be used cautiously.
## 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 fracture (hip, wrist, spine) with prolonged use, hypomagnesemia (can be severe), vitamin B12 deficiency, potential for fundic gland polyps.
## Key Drug Interactions
* **Drugs Dependent on Gastric pH:** May decrease absorption of drugs like ketoconazole, itraconazole, posaconazole, erlotinib, and vitamin B12. May increase levels of drugs like digoxin.
* **CYP2C19 and CYP3A4 Substrates:** Pantoprazole is a moderate inhibitor of CYP2C19. Caution with drugs metabolized by this enzyme (e.g., clopidogrel, voriconazole). It can also interact with CYP3A4 substrates.
* **Methotrexate:** May increase methotrexate levels.
## Monitoring
* Monitor for signs and symptoms of C. difficile infection.
* Consider periodic serum magnesium levels, especially with prolonged use or concomitant diuretic/digoxin use.
* Monitor for signs of vitamin B12 deficiency with long-term therapy.
* Monitor bone mineral density in patients at risk for osteoporosis.
## Clinical Pearls
* Oral pantoprazole is generally administered 30-60 minutes before a meal.
* IV pantoprazole is typically given as an infusion over 15 minutes.
* PPIs are associated with an increased risk of fracture, C. difficile infection, and hypomagnesemia. Use the lowest effective dose for the shortest duration necessary.
* Antacids may be used as needed for symptomatic relief.
*Disclaimer: This information is intended for healthcare professionals and does not replace individual clinical judgment. Always verify current prescribing information and consult relevant guidelines.*
