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Is minoxidil toxic to cats?

Also called: Rogaine, Regaine, hair regrowth, hair growth treatment, minoxidil foam

Toxic

Hair regrowth products with minoxidil can cause heart failure in cats.

Yes. Minoxidil, the active ingredient in hair regrowth products such as Rogaine, can cause signs of heart failure in cats. Cats can be exposed by licking it off skin or surfaces.

Signs to watch for

  • Heart and breathing signs caused by heart failure.

How cats get exposed

  • On skin, fur or surfacesProducts on the skin can be absorbed, and cats swallow what they groom off their fur.

Sources

  • Household Hazards – Toxic Hazards for CatsVCA Animal Hospitals · Read 9 October 2026
    Exposure to topical hair growth products with minoxidil (such as Rogaine®), can result in signs of heart failure in cats
    With topical exposures, the skin may absorb the toxin, but the cat can also ingest it when grooming its fur.
  • Cats and poisonsInternational Cat Care · Read 9 October 2026
    Human medicines such as laxatives, aspirin, paracetamol, ibuprofen, minoxidil, psoriasis creams, 5-fluorouracil and antidepressants.
    If you’re concerned your cat has come into contact with any of the substances listed, contact your veterinary team immediately

Information from VCA Animal Hospitals and International Cat CareSources checked 9 October 2026

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