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Metformin (diabetes medication)

Pet medication safety reference — educational information only.
Medication reference

What to know

Metformin (diabetes medication) — medication safety for dogs and cats

Call your vetReference for: dogs and cats.

Overview

Metformin can cause severe stomach upset and, rarely, more serious metabolic issues in dogs after large ingestions. Cats are less commonly affected by accidental metformin ingestion, but any non-veterinary medication should be assessed.

Symptoms

Vomiting, diarrhea, lethargy, collapse (severe cases)

Typical onset

1–12 hours

Formulations

Extended-release tablets can behave differently after ingestion.

What to do

Contact your veterinarian for amount-based guidance; bring mg strength.

This page is educational and does not replace veterinary advice. For possible poisoning or ingestion, contact UVEC at (801) 218-2227 or ASPCA Poison Control at (888) 426-4435.

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Medication safety reference

Search common household medications and why they can be risky for pets. This is not dosing guidance — when in doubt, call us or poison control.

Educational reference only. It does not replace an exam or phone advice for your specific pet. Never give human medications to animals unless your veterinarian tells you exactly what to use.

23 results · 13 emergency-level

Metformin can cause severe stomach upset and, rarely, more serious metabolic issues in dogs after large ingestions. Cats are less commonly affected by accidental metformin ingestion, but any non-veterinary medication should be assessed.

Symptoms
Vomiting, diarrhea, lethargy, collapse (severe cases)
Onset
1–12 hours
Formulations
Extended-release tablets can behave differently after ingestion.
Recommended next step
Contact your veterinarian for amount-based guidance; bring mg strength.
This tool is informational only and does not replace veterinary advice. For possible poisoning or ingestion, contact UVEC at (801) 218-2227 or ASPCA Poison Control at (888) 426-4435. Bring medication packaging when possible.
Common questions

About this tool

  • Is this tool telling me what dose to give my pet?

    No. It is a general education library about common household medications and why they can be dangerous to pets. Dosing depends on species, weight, health conditions, and the exact product — only your veterinarian should choose a medication plan for your animal.

  • My pet just ate pills. Should I use this page first?

    If you believe your pet swallowed medication, call Utah Veterinary Emergency Center or a poison hotline right away. Bring the bottle with strength (mg), formulation (tablet/capsule/liquid), and approximate number eaten.

  • Why do you ask for dog vs cat?

    Cats and dogs differ in sensitivity to many drugs (for example, acetaminophen). Filtering helps you read entries that apply to the pet you are worried about.

  • Are “natural” supplements or topical creams safer than pills?

    Not necessarily. Creams can be licked, and supplements can be concentrated or combined with other ingredients (including xylitol in some liquids). Always check labels and ask your veterinarian before exposing your pet.

  • Is this the same as calling poison control?

    No. Poison control can do case-specific triage using your pet’s weight and exact product. This page cannot replace that individualized guidance.

  • What are Utah Veterinary Emergency Center’s hours?

    We are open daily from 9:00 am to 9:00 pm for urgent care and appointments. For life-threatening emergencies outside those hours, call our number for guidance and referral to a 24-hour facility if needed.