Pet Medication 101: Tagamet

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Pet Medication 101: Tagamet

It’s important to understand a medication’s uses and side effects before giving it to your pet. This medication info sheet is meant to give you a good understanding of what Tagamet (cimetidine) is used for, how it works, and potential side effects in cats and dogs. Always consult a veterinarian before giving your pet any medication.

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1. Drug Name:


2. Brand Names:

Tagamet, Good Sense Heartburn Relief

3. How Dispensed:

Over the counter and prescription

4. Forms:

200mg, 300mg, 400mg, and 800mg tablets; 300mg/5mL liquid; 150mg/mL injectable solution

5. Drug Type/Class:

Histamine-2 blocker

6. Uses in Dogs and Cats:

Stomach ulcers, intestinal ulcers, stomach inflammation and erosion due to kidney disease, stress-related gastritis, drug-induced gastritis, acid reflux, esophageal inflammation, inflammatory bowel disease, and parvovirus

7. How it Works:

Cimetidine decreases the amount of acid that is produced in the stomach by inhibiting the histamine-2 receptor. Decreasing the amount of acid in the stomach produces a more favorable environment to rest and heal.

8. Side Effects and/or Signs of Overdose:

Confusion, headaches, exacerbation of heart arrhythmias, drooling in cats, irregular heartbeat, difficulty breathing, collapse

9. Drug Interactions:

  • Alprazolam
  • Beta-blockers
  • Calcium channel blockers
  • Cefpodoxime
  • Chloramphenicol
  • Cisapride
  • Clopidogrel
  • Cyclosporine
  • Diazepam
  • Loratadine
  • Metronidazole
  • Mirtazapine
  • Sildenafil
  • Theophylline
  • Tricyclic antidepressants

10. Cautionary Statements:

  • Never give your pet Tagamet without the approval of your veterinarian.
  • Use with caution in pets with kidney disease, liver disease, and heart rhythm abnormalities.
  • Use with caution in geriatric patients.
  • Safety has not been established for pregnant or lactating animals.
  • Can alter skin testing for allergen-specific immunotherapy.

Read more:

Medication Info Sheet: Zantac

Medication Info Sheet: Imodium

Medication Info Sheet: Dramamine

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