Pantoprazole

Pantoprazole is a potent **proton pump inhibitor (PPI)** used to treat and prevent gastric acid-related pathologies, such as gastric ulcers, erosive esophagitis, and stress-related mucosal disease. While **omeprazole** is the most widely recognized oral PPI in veterinary medicine, pantoprazole is highly valued in clinical practice for its **intravenous (IV) formulation**. This makes it an excellent choice for hospitalized, critically ill patients (e.g., dogs or cats with severe pancreatitis, parvoviral enteritis, or active gastrointestinal bleeding) who cannot tolerate oral medications or have compromised GI absorption. * **Clinical Pearl:** Although its plasma half-life is very short (about 1 hour), its clinical effect lasts for 24 hours or more due to irreversible binding at the receptor site. * It has also been shown to directly reduce *in vitro* counts of *Helicobacter pylori* and is utilized in some eradication protocols.

กลไกการออกฤทธิ์: Pantoprazole is a substituted benzimidazole weak base. It accumulates in the highly acidic environment of the gastric parietal cell secretory canaliculi, where it is protonated and converted into its active sulfenamide form. * **Mechanism:** The active form binds **irreversibly via covalent disulfide bonds** to the **H+/K+ ATPase enzyme system** (the "proton pump") at the secretory surface of gastric parietal cells. * **Pathway:** Systemic circulation → Parietal cell → Acidic canaliculi → Active sulfenamide → **Irreversible inhibition of H+/K+ ATPase** → Profound suppression of both basal and stimulated gastric acid secretion. Because the binding is irreversible, acid secretion only resumes when new proton pump enzymes are synthesized by the parietal cell, explaining the prolonged duration of action despite rapid systemic clearance.

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