Is Iron supplements toxic to cats?
No. Iron tablets (ferrous sulphate, ferrous fumarate — common US 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.
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 ASPCA Poison Control on (888) 426-4435 — 24/7, charges apply.
- Note how much iron supplement was eaten, when, and your cat's weight.
What's the full picture?
Iron supplements are one of the more common medication toxicities in cats. The toxic dose is relatively low — approximately 20mg/kg of elemental iron — and standard iron supplement tablets contain 65-325mg of iron each. A single tablet from a bottle left accessible can be dangerous to a small or medium-sized cat.
Iron toxicity has a distinctive two-phase pattern. The first phase (within hours) causes severe GI symptoms: vomiting, diarrhea, and abdominal pain — sometimes with blood in the vomit or stool. This phase often improves temporarily, creating a false impression of recovery. The second phase (12-48 hours later) involves liver damage and potentially cardiovascular collapse. The false recovery period is dangerous because it may delay seeking treatment.
Prenatal vitamins are a particular risk because they combine high-dose iron with other fat-soluble vitamins (A, D) that are also toxic to cats in high doses. A single prenatal vitamin tablet could cause multi-toxin poisoning. Keep prenatal vitamins in a sealed container and never leave them on a bedside table.
Children's iron-containing vitamins (Flintstones, gummy vitamins) are often more accessible and appealing-looking than adult pills, but they still contain meaningful amounts of iron. A 13mg children's vitamin isn't as immediately dangerous as an adult supplement, but a whole bottle is. Store all vitamins as you would medications.
If your cat has ingested any iron supplement, contact your vet or ASPCA Poison Control at (888) 426-4435 immediately — even if the cat seems fine. The deceptive recovery phase means waiting for symptoms can lead to delayed treatment with worse outcomes.
Symptoms to watch for
Emergency vet treatment for poisoning typically costs $800–$3,000 in the US. Pet insurance covers it — and you can get a quote in under 2 minutes.
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Human iron supplements contain doses fatal to cats. If your cat needs supplementation, use vet-prescribed products only.
Cat-specific supplements (vet-supervised only)
Questions owners ask
What are signs of iron poisoning in cats?
First phase (within hours): severe vomiting and diarrhea, possibly with blood, and abdominal pain. There may be a temporary improvement before a second phase (12-48 hours later) of liver damage, lethargy, and in severe cases, cardiovascular collapse. Don't be misled by apparent improvement — seek vet care promptly.
Are prenatal vitamins dangerous to cats?
Yes — prenatal vitamins contain high doses of iron plus fat-soluble vitamins (A, D) that are also toxic to cats in excess. A single prenatal tablet could cause multi-toxin poisoning. Store all vitamins in a sealed container and never leave them accessible to cats.
My cat chewed a vitamin bottle and may have eaten some. What should I do?
Call your vet or ASPCA Poison Control at (888) 426-4435 with the product name and the cat's weight. If the product contains iron, vitamin D, or vitamin A, treat as an emergency even if the cat seems fine — symptoms may be delayed.
Alongside secure storage, a pheromone diffuser can lower the stress that drives cats to chew strange things.
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About this guidance
Every entry on this site is compiled from published US veterinary toxicology sources — AAFP, ASPCA Animal Poison Control Center (ASPCA APCC) references, AVMA-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 US 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 ASPCA Poison Control on (888) 426-4435 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 Cat Ate It editorial team