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# Pantoprazole
## Overview
Pantoprazole is a proton pump inhibitor (PPI) used to reduce stomach acid production.
## Primary Indications
* Healing of erosive esophagitis associated with gastroesophageal reflux disease (GERD).
* Maintenance of healing of erosive esophagitis.
* Pathological hypersecretory conditions, including Zollinger-Ellison syndrome.
## Adult Dosing
* **Erosive Esophagitis:** 40 mg once daily for up to 8 weeks. For maintenance, 40 mg once daily.
* **Zollinger-Ellison Syndrome:** Starting dose is typically 40 mg twice daily, but can be adjusted based on gastric acid output. The maximum recommended dose is 120 mg every 8 hours (IV) or 240 mg once daily (IV). Oral doses are generally limited to 40 mg twice daily.
## Pediatric Dosing
* **12 years and older:**
* **Erosive Esophagitis:** 40 mg once daily for up to 8 weeks.
* Dosing for children younger than 12 years with GERD or erosive esophagitis is not established by the FDA.
## Dose Adjustments
* **Hepatic Impairment:** In patients with severe hepatic impairment, a dose of 20 mg once daily is recommended.
* **Renal Impairment:** No dose adjustment is necessary in patients with renal impairment.
## 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 increased risk of fractures (hip, wrist, spine), Clostridium difficile infection, vitamin B12 deficiency, and hypomagnesemia.
## Key Drug Interactions
* **Drugs dependent on gastric pH for absorption:** PPIs can decrease the absorption of drugs such as ketoconazole, itraconazole, posaconazole, iron salts, and vitamin B12.
* **Methotrexate:** Concomitant use with PPIs may increase serum levels of methotrexate.
* **CYP2C19 substrates:** Pantoprazole is a moderate inhibitor of CYP2C19. Consider potential interactions with drugs metabolized by this enzyme.
* **Clopidogrel:** Pantoprazole may decrease the effectiveness of clopidogrel due to CYP2C19 inhibition.
## Monitoring
* Monitor for signs and symptoms of Clostridium difficile-associated diarrhea.
* Monitor serum magnesium levels, especially with prolonged use (typically >1 year).
* Monitor for signs of bone fracture.
## Clinical Pearls
* Pantoprazole is typically taken once daily, 30-60 minutes before a meal.
* For IV administration, reconstitute and further dilute as per manufacturer instructions.
* Discontinuation of PPIs should be considered gradually to avoid rebound acid hypersecretion.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines before making any treatment decisions.*
