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# Pantoprazole
## Overview
Pantoprazole is a proton pump inhibitor (PPI) that reduces gastric acid production.
## Primary Indications
* Healing of erosive esophagitis
* Maintenance of healing of erosive esophagitis
* Symptomatic gastroesophageal reflux disease (GERD)
* Pathological hypersecretory conditions (e.g., Zollinger-Ellison syndrome)
## Adult Dosing
* **Erosive esophagitis healing:** 40 mg orally or intravenously once daily for up to 8 weeks.
* **Maintenance of healing erosive esophagitis:** 40 mg orally once daily. Some patients may be treated with 20 mg orally once daily.
* **Symptomatic GERD:** 40 mg orally once daily for up to 4 weeks.
* **Pathological hypersecretory conditions:** Starting dose 40 mg orally or intravenously twice daily. Doses can be titrated up to 240 mg orally or intravenously daily. Doses >80 mg daily should be divided and administered every 12 hours.
## Pediatric Dosing
Dosing varies by indication and age. Consult specific pediatric guidelines or product information.
* **Erosive esophagitis healing (1-5 years):** 20 mg orally once daily for up to 8 weeks.
* **Erosive esophagitis healing (6-11 years):** 20 mg orally once daily for up to 8 weeks, may increase to 40 mg daily if needed.
* **Erosive esophagitis healing (12-17 years):** 40 mg orally once daily for up to 8 weeks.
* **Symptomatic GERD (5-11 years):** 20 mg orally once daily for up to 4 weeks.
* **Symptomatic GERD (12-17 years):** 40 mg orally once daily for up to 4 weeks.
## Dose Adjustments
No dose adjustment is typically required for renal impairment.
For severe hepatic impairment, a maximum dose of 20 mg orally once daily is recommended.
## Contraindications
* Known hypersensitivity to pantoprazole or any component of the formulation.
* Use of rilpivirine-containing products.
## Adverse Effects
Common: Headache, diarrhea, nausea, abdominal pain, dizziness, flatulence.
Less common: Rash, pruritus, arthralgia, myalgia.
Long-term use (over 1 year) may be associated with an increased risk of:
* Clostridium difficile-associated diarrhea
* Bone fractures (hip, wrist, spine)
* Vitamin B12 deficiency
* Hypomagnesemia (can be severe)
* Fundic gland polyps
## Key Drug Interactions
* **Drugs requiring gastric acid for absorption:** Ketoconazole, itraconazole, posaconazole, iron salts, vitamin B12. Pantoprazole can decrease their absorption.
* **Methotrexate:** PPIs may increase methotrexate levels, potentially leading to toxicity.
* **CYP2C19 substrates:** Pantoprazole can inhibit CYP2C19, affecting metabolism of drugs like clopidogrel (reduced efficacy).
* **Rilpivirine:** Concomitant use is contraindicated due to risk of decreased rilpivirine plasma concentrations.
## Monitoring
* Monitor for relief of GERD symptoms.
* Monitor for signs and symptoms of C. difficile infection.
* Consider monitoring magnesium levels, especially with long-term use or concurrent diuretic use.
* Monitor for signs of bone fracture.
## Clinical Pearls
* Oral pantoprazole is generally preferred over IV unless oral administration is not possible.
* For IV administration, reconstitute and further dilute as per manufacturer instructions. Infuse over 15 minutes.
* PPIs are most effective when taken before the first meal of the day.
* Long-term use should be re-evaluated periodically, and the lowest effective dose should be used.
* Consider the potential for drug interactions, particularly with clopidogrel and methotrexate.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the current prescribing information and relevant clinical guidelines for complete and up-to-date details before making treatment decisions.
