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# Pantoprazole
## Overview
Pantoprazole is a proton pump inhibitor (PPI) that reduces gastric acid production. It is available in oral and intravenous formulations.
## Primary Indications
* Gastroesophageal reflux disease (GERD) - symptomatic relief and healing of erosive esophagitis.
* Duo...enal ulcers.
* Gastric ulcers.
* Zollinger-Ellison syndrome.
* Eradication of *Helicobacter pylori* infection (in combination with antibiotics).
## Adult Dosing
* **GERD (Symptomatic Relief):** 20 mg orally once daily.
* **Healing of Erosive Esophagitis:** 40 mg orally or IV once daily for up to 8 weeks. A further 8 weeks may be needed.
* **Duo...enal Ulcers:** 40 mg orally once daily for 10 to 15 days.
* **Gastric Ulcers:** 40 mg orally once daily for 4 to 8 weeks.
* **Zollinger-Ellison Syndrome:** 40 mg orally or IV twice daily. Doses may need to be titrated up to 240 mg daily (given as 40 mg or 80 mg every 8 hours).
* ***H. pylori* Eradication:** 40 mg orally twice daily for 7 to 14 days, in combination with specific antibiotics (clarithromycin, amoxicillin, and/or metronidazole).
## Pediatric Dosing
* **GERD (Healing of Erosive Esophagitis):**
* **1 to 5 years:** 20 mg orally once daily for up to 8 weeks.
* **5 to 12 years:** 20 mg orally once daily for up to 8 weeks. Doses of 40 mg once daily have also been used.
* **12 to 17 years:** 40 mg orally once daily for up to 8 weeks.
* **Note:** Pediatric dosing beyond these indications or at different ages may require specialist consultation or adherence to specific institutional protocols.
## Dose Adjustments
* **Hepatic Impairment:** Maximum daily dose is 40 mg orally or IV once daily.
## Contraindications
* Known hypersensitivity to pantoprazole, any component of the formulation, or other substituted benzimidazoles.
## Adverse Effects
* **Common:** Diarrhea, headache, nausea, abdominal pain, dizziness, flatulence.
* **Serious:**
* *Clostridioides difficile*-associated diarrhea (CDAD).
* Fracture of the hip, wrist, or spine (associated with long-term, high-dose PPI therapy).
* Hypomagnesemia (can be severe and may lead to hypocalcemia, hypokalemia, tetany, seizures, and arrhythmias; usually occurs after at least 1 year of use).
* Vitamin B12 deficiency (may occur with long-term use, typically >3 years).
* Fundic gland polyps (generally benign and reversible upon discontinuation).
* Cutaneous and systemic lupus erythematosus.
## Key Drug Interactions
* **Drugs dependent on gastric pH for absorption:** Ketoconazole, itraconazole, posaconazole, iron salts, mycophenolate mofetil.
* **Methotrexate:** PPIs may increase methotrexate levels, potentially leading to toxicity.
* **CYP2C19 substrates:** Pantoprazole is a moderate inhibitor of CYP2C19. Consider potential interactions with drugs like clopidogrel, though clinical significance is debated.
* **Antiretrovirals:** Such as rilpivirine, atazanavir.
## Monitoring
* Monitor for signs and symptoms of CDAD.
* Monitor serum magnesium levels periodically, especially in patients on long-term therapy or concomitant diuretic use.
* Monitor for signs and symptoms of vitamin B12 deficiency in patients on long-term therapy.
* Monitor bone mineral density in patients at risk for osteoporosis.
## Clinical Pearls
* PPIs are most effective when taken 30-60 minutes before a meal.
* For *H. pylori* eradication, ensure all prescribed antibiotics are completed as directed.
* Long-term PPI use is associated with potential risks; consider the lowest effective dose and shortest duration necessary.
* IV pantoprazole should be infused over at least 15 minutes. Do not reconstitute or mix with other drugs.
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**Disclaimer:** This information is intended for healthcare professionals and should not replace professional medical advice. Always consult the most current prescribing information and relevant clinical guidelines before making treatment decisions.
