Is Iron supplements toxic to cats?
No. Iron tablets (ferrous sulphate, ferrous fumarate — common UK brands: Feroglobin, Galfer, Spatone) are toxic to cats. Iron overdose causes severe vomiting, followed by delayed liver and heart injury after a deceptive 'recovery' period.
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Content compiled with reference to guidance from the Blue Cross, PDSA, Royal Veterinary College (RVC), Battersea, and Animal PoisonLine. This site does not provide veterinary advice — always consult a vet. Last reviewed: 27 September 2026.
Key facts
- Verdict: No — dangerous to cats. Iron supplements should never be given deliberately.
- Category: Supplement
- Onset: Signs can start 0–6 hours — see the full timeline below.
- If it's already happened: Call your vet now, or the Animal PoisonLine on 01202 509000 (24/7, charges apply) — see the emergency steps below.
If your cat has just eaten iron supplements
- Move your cat away from the iron supplement.
- Don't induce vomiting at home — this is dangerous in cats.
- Call your vet or out-of-hours emergency vet immediately.
- If you can't reach a vet, call the Animal PoisonLine on 01202 509000 — 24/7, charges apply.
- Note how much iron supplement was eaten, when, and your cat's weight.
What's the full picture?
Iron toxicity has a characteristic biphasic pattern: severe vomiting and diarrhoea in the first 6 hours, followed by apparent recovery for 12–24 hours, then worsening again with liver failure and cardiac problems.
The deceptive recovery phase is dangerous — owners think the cat is fine and don't go to the vet. Veterinary assessment is essential for any iron overdose regardless of apparent improvement.
Multivitamins often contain iron. Check the label carefully. Children's chewable vitamins with iron are a particular risk because they're flavoured and attractive.
Symptoms to watch for
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Cat-specific supplements (vet-supervised only)
For prescription-strength flea, tick and wormer protection, Best Vet Care ships direct from licensed vets — no vet visit required. (affiliate link)
Questions owners ask
How much iron supplement is dangerous to a cat?
A single adult-strength tablet can be enough to cause serious toxicity in a cat, particularly with common UK brands like Feroglobin, Galfer, or Spatone — there's no small dose worth assuming is safe, especially given the deceptive recovery pattern that follows initial symptoms.
My cat seemed to recover after vomiting from an iron tablet — are we in the clear?
No — this apparent recovery, typically lasting 12–24 hours, is a well-recognised and dangerous phase of iron toxicity, not a sign the danger has passed. Liver failure, shock, and cardiac problems can develop at 24–72 hours after the initial vomiting settles, which is exactly why veterinary assessment is essential for any iron overdose regardless of how your cat looks in that quiet middle period.
Are there safe multivitamins I could give my cat instead of a human supplement?
Veterinary-formulated feline multivitamins are dosed appropriately for a cat's much smaller body size and different nutritional needs, unlike human multivitamins which often include iron at levels calibrated for a person many times a cat's weight. Never give a human vitamin or mineral supplement to a cat without checking with your vet first, even one that seems generally healthy like a basic multivitamin.
A lockable medicine box is the simplest way to keep human tablets out of reach of a curious cat.
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Related
Sources referenced for this guidance
- Veterinary Poisons Information Service (VPIS) — UK clinical toxicology reference used by vets
- International Cat Care — feline-specific clinical guidance
- BSAVA — British Small Animal Veterinary Association reference materials
- Merck Veterinary Manual — professional veterinary reference
About this guidance
Every entry on this site is compiled from published UK veterinary toxicology sources — International Cat Care, Veterinary Poisons Information Service (VPIS) references, RCVS-registered practice materials, and peer-reviewed feline medicine literature. Where the evidence is mixed, we err on the cautious side because cats are unusually sensitive to many common substances that are harmless to humans and even to dogs.
This is general information written for UK cat owners. It is not personalised veterinary advice for your specific cat, their age, weight, medical history, or the exact exposure you're dealing with. If your cat has eaten something or is unwell, call your vet first. The Animal PoisonLine on 01202 509000 is available 24/7 for a small fee and can tell you whether an emergency visit is needed.
Entries are reviewed and updated as new research emerges. Spotted an error? Let us know — corrections are investigated and applied within 24 hours. For more context on how we work, see about and our full disclaimer.
Last reviewed: · By the What Can My Cat Eat? editorial team