Is Sudafed (pseudoephedrine) toxic to cats?
No — emergency. Sudafed, Mucinex / NyQuil, and similar decongestants contain pseudoephedrine — a stimulant that's dangerous to cats at very small doses. A single tablet can cause significant toxicity in a 9 lb (4 kg) cat.
If your cat has just eaten sudafed (pseudoephedrine)
- Move your cat away from the Sudafed or decongestant.
- 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 Sudafed or decongestant was eaten, when, and your cat's weight.
What's the full picture?
Sudafed contains pseudoephedrine, a decongestant that acts as a stimulant on the central nervous and cardiovascular systems. Cats are extremely sensitive to pseudoephedrine — far more so than humans. Even a fraction of a standard 30mg tablet can cause life-threatening toxicity in an average-sized cat.
Pseudoephedrine causes rapid, dramatic symptoms in cats: heart rate can spike to dangerous levels within 30-60 minutes of ingestion. Other signs include agitation, tremors, dilated pupils, high blood pressure, rapid breathing, and in severe cases, cardiac arrhythmias and seizures. This is a true emergency — don't wait to see if symptoms develop.
Sudafed is kept behind the pharmacy counter in many US states due to its precursor role in methamphetamine production. This actually makes it more commonly left in medicine bags or receipt envelopes rather than in pill bottles on counters — check anywhere medicine bags are stored if your cat has access.
Other decongestants containing pseudoephedrine or phenylephrine — DayQuil, NyQuil, Claritin-D, Mucinex-D, and many combination cold medicines — carry the same risk. Phenylephrine (which replaced pseudoephedrine in some products) is also toxic to cats. Always check the active ingredients in any cold or sinus medicine.
If your cat has ingested any Sudafed or pseudoephedrine-containing medication, treat it as an emergency and call your vet or ASPCA Poison Control at (888) 426-4435 ($95 fee) immediately. Don't induce vomiting without veterinary guidance — the stimulant effects can make induced vomiting more dangerous.
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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Cat Owner Essentials
Questions owners ask
How much Sudafed is dangerous for cats?
Even a small fraction of a 30mg tablet can cause serious toxicity in an average cat. The toxic dose for pseudoephedrine in cats is very low — approximately 1-2mg/kg can cause significant effects. A standard Sudafed tablet (30mg) contains enough to seriously harm a 15-30 lb cat, and maximum-strength tablets (120mg) are dangerous in much smaller amounts.
My cat found a Sudafed tablet on the floor. What should I do?
Call your vet or ASPCA Poison Control at (888) 426-4435 immediately — don't wait for symptoms. Pseudoephedrine toxicity progresses rapidly and is much more treatable in the first 30-60 minutes than after symptoms develop. Tell them the dose, the time of exposure, and your cat's weight.
Are other cold medicines like DayQuil or NyQuil dangerous too?
Yes. Many cold and flu combination medications contain pseudoephedrine, phenylephrine, or acetaminophen — all toxic to cats. DayQuil and NyQuil also typically contain acetaminophen, which is fatal to cats at very low doses. Keep all cold medicines in a closed cabinet away from cat access.
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