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# Pantoprazole
## Overview
Pantoprazole is a proton pump inhibitor (PPI) that suppresses gastric acid secretion by irreversibly inhibiting the H+/K+-ATPase enzyme system in gastric parietal cells.
## Primary Indications
* Gastroesophageal reflux disease (GERD) - symptomatic and erosive esophagitis
* Healing of erosive esophagitis
* Pathological hypersecretory conditions (e.g., Zollinger-Ellison syndrome)
* Duodenal ulcers
* Gastric ulcers
## Adult Dosing
* **GERD/Erosive Esophagitis:** 20 mg to 40 mg once daily. For healing erosive esophagitis, typically 40 mg once daily for up to 8 weeks. Maintenance therapy can be 20 mg once daily.
* **Pathological Hypersecretory Conditions:** Starting dose is 40 mg twice daily, may be increased as needed. Doses up to 240 mg daily have been administered.
* **Duodenal/Gastric Ulcers:** 40 mg once daily for up to 4 weeks (duodenal) or up to 8 weeks (gastric).
Maximum dose generally considered to be 40 mg twice daily, although higher doses may be used in severe hypersecretory states under specialist guidance.
## Pediatric Dosing
* **GERD/Erosive Esophagitis:**
* **12 to 17 years:** 20 mg to 40 mg once daily for up to 8 weeks.
* **5 to 11 years:** 20 mg once daily for up to 8 weeks. Dosing may be adjusted based on weight (e.g., 10 mg for 15-30 kg, 20 mg for >30 kg).
* **Less than 5 years:** Dosing is not well established. Use with caution and under specialist supervision.
## Dose Adjustments
No dose adjustment is typically required for hepatic impairment, but caution is advised. Severe hepatic impairment may necessitate lower doses (e.g., 20 mg once daily). No dose adjustment is needed for renal impairment.
## Contraindications
* Known hypersensitivity to pantoprazole, benzimidazole derivatives, or any component of the formulation.
## Adverse Effects
Common: Headache, diarrhea, nausea, dizziness, abdominal pain, flatulence.
Less Common: Rash, itching, fatigue, muscle pain, elevated liver enzymes.
Long-term use concerns: Increased risk of *Clostridioides difficile*-associated diarrhea, bone fractures (hip, wrist, spine), hypomagnesemia, vitamin B12 deficiency.
## Key Drug Interactions
* **Clopidogrel:** Pantoprazole may decrease the antiplatelet effect of clopidogrel. Consider alternative PPIs or separate administration if concomitant use is necessary.
* **Ketoconazole, Itraconazole, Posaconazole:** Acid suppression may decrease absorption.
* **Methotrexate:** PPIs may increase methotrexate levels. Monitor for toxicity.
* **Drugs dependent on gastric pH for absorption:** e.g., rilpivirine, nelfinavir.
## Monitoring
* Monitor for signs and symptoms of *Clostridioides difficile*-associated diarrhea.
* Monitor serum magnesium levels periodically, especially with prolonged use (>3 months) or concomitant diuretic use.
* Monitor for signs of vitamin B12 deficiency with long-term therapy.
* Monitor bone mineral density in patients at risk for osteoporosis.
## Clinical Pearls
* Administer 30 minutes before a meal for optimal efficacy.
* Enteric-coated formulations should be swallowed whole and not crushed, chewed, or broken.
* For patients unable to swallow intact tablets, the delayed-release pantoprazole for oral suspension can be used. Mix with 100 mL of water or applesauce.
* Consider the shortest duration of therapy needed to treat the condition.
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**Disclaimer:** This information is intended for clinical decision-making support and does not replace the need for critical evaluation of the information in light of individual patient circumstances. Always consult the most current official prescribing information and relevant clinical guidelines before prescribing any medication.
