Medication safety · 2 min read

Is Pseudoephedrine (Sudafed) toxic to cats?

No — dangerous

No. Pseudoephedrine — the decongestant in Sudafed and many cold/flu remedies — is a stimulant that causes rapid heart rate, agitation, and seizures in cats.

If your cat has just eaten pseudoephedrine (sudafed)

  1. Move your cat away from any remaining pseudoephedrine. Do not try to make them vomit at home — this is dangerous in cats and rarely works.
  2. Note how much was eaten and when, and keep the packaging or a photo of the plant/substance if you can.
  3. Call your vet immediately, even out of hours. Tell them your cat's weight, what they ate, and when.
  4. If you can't reach your vet, call Animal PoisonLine (01202 509000) — paid triage, 24/7 for guidance. They can advise on urgency and route you to emergency care.

What's the full picture?

Pseudoephedrine is a decongestant found in Sudafed, Benylin Day & Night, and some UK cold/flu combination products. It's a potent stimulant in cats at small doses.

Signs include agitation, tremors, rapid heart rate, dilated pupils, and hyperthermia. Seizures can occur at larger doses.

UK availability is restricted (pharmacy-only, limited quantities) but household supplies are common. Store cold and flu medications out of reach.

Symptoms to watch for

0–2 hours
Restlessness, hyperactivity, dilated pupils, rapid breathing.
2–8 hours
Rapid heart rate, high blood pressure, tremors, elevated temperature.
8–24 hours
Seizures, cardiac arrhythmias in severe cases.

If you're worried right now

Call your vet or out-of-hours emergency vet first. For poison advice, the Animal PoisonLine (UK) is on 01202 509000 — 24/7, charges apply. Your vet can also call the Veterinary Poisons Information Service (VPIS) directly.

ADHD medications (methylphenidate, amphetamines) no Antidepressants (SSRIs) no Caffeine (coffee, tea, energy drinks) no Sudafed (pseudoephedrine) no

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

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