💊 Proton Pump Inhibitor

Nexium Dosage for Dogs Calculator

Evidence-based esomeprazole (Nexium) dosing for dogs — covering gastric ulcers, GERD, and acid-suppression protocols with capsule breakdown guidance.

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Veterinary supervision required. Chronic PPI use can alter gut microbiome and reduce vitamin B12 absorption. Confirm indication before long-term use.

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About Omeprazole (Prilosec / Nexium)

Drug Class

Proton Pump Inhibitor (PPI) — Gastric Acid Suppressant

Mechanism of Action

Omeprazole irreversibly inhibits the H⁺/K⁺-ATPase proton pump in gastric parietal cells, reducing acid secretion by 90–95%. Esomeprazole (Nexium) is the S-enantiomer with similar efficacy and slightly longer duration.

Primary Uses in Dogs

Gastric ulcers, erosive gastritis, GERD, oesophagitis, gastrinoma (Zollinger-Ellison syndrome), stress ulcer prophylaxis in hospitalised patients, and Helicobacter pylori co-treatment.

Dosing Quick Reference

Indication Dose Frequency
GI ulcers/erosions 1 mg/kg q24h PO fasted
GERD / oesophagitis 0.5–1 mg/kg q12h PO
Gastrinoma 1–2 mg/kg q12h PO

Common Side Effects

  • Diarrhoea or soft stools
  • Nausea or vomiting (paradoxical)
  • Hypomagnesaemia with chronic use (> 3 months)
  • Increased risk of enteric infections (Salmonella, C. diff) with long-term use
  • Rebound hypersecretion on abrupt discontinuation

Monitoring

Electrolytes (especially Mg²⁺) with long-term use. Reassess gastric pathology by endoscopy if no response after 4–6 weeks.

⚠️ Give on an empty stomach 30 minutes before food for best efficacy. Taper gradually after prolonged use to avoid acid rebound. Long-term continuous use (> 8 weeks) should be reassessed with your vet.

What Is Esomeprazole (Nexium)?

Esomeprazole is the S-enantiomer of omeprazole, a proton pump inhibitor (PPI) that irreversibly blocks the H⁺/K⁺-ATPase pump in gastric parietal cells, producing profound acid suppression. It is used in dogs for gastric ulcers, esophagitis, gastroesophageal reflux (GERD), Helicobacter-associated gastritis, and to protect the gastric mucosa during NSAID therapy.

PPIs require an acidic environment to be activated; they are pro-drugs converted to active sulfenamide in the secretory canaliculus. Onset of maximal effect is 3–5 days with repeated dosing. Available as 20 mg and 40 mg delayed-release capsules and IV powder for reconstitution.

Pharmacokinetics in Dogs

  • Bioavailability: ~60–70% oral (food reduces absorption — give 30 min before meals)
  • Onset: Single dose partial effect; full suppression after 3–5 days
  • Half-life: ~1–2 hours (effect outlasts plasma half-life due to irreversible pump binding)
  • Metabolism: Hepatic CYP2C19, CYP3A4
  • Forms: 20 mg, 40 mg delayed-release capsules; IV 20 mg, 40 mg vials

How to Use This Calculator

  1. Enter your dog’s weight in kg or lbs
  2. Select the clinical indication
  3. Choose available capsule strength
  4. Click Calculate to see daily dose and tablet count
  5. Give capsules whole on an empty stomach, 30 minutes before first meal

🧮 Esomeprazole Dose Calculator

Esomeprazole Dosing Result

References

  1. Plumb DC. Plumb’s Veterinary Drug Handbook, 9th ed. Wiley-Blackwell; 2018.
  2. Marks SL, et al. ACVIM consensus statement on gastroprotectant use. J Vet Intern Med. 2018;32(6):1823-1840.
  3. Tolbert K, et al. Efficacy of oral famotidine and 2 omeprazole formulations for the control of intragastric pH in dogs. J Vet Intern Med. 2011;25(1):47-54.