Is Nitroglycerin tablets/spray Safe for Cats?
Why it’s a problem
Nitroglycerin relaxes blood vessels, and a cat’s small circulatory system cannot buffer an unsupervised dose. Severe low blood pressure can lead to fainting, weakness, and shock. Even licking residue from spilled spray or a used patch has been reported to cause signs in pets.
How to keep your pet safe
Keep tablets, spray, and patches stored high and closed, and dispose of used patches in a sealed container cats cannot open, since they still contain drug. Wash skin after handling, and never let a cat groom anyone wearing a patch.
Warning signs to watch for
Sudden weakness, stumbling, drooling, vomiting, pale gums, rapid breathing, fainting, collapse.
When to call the vet
Call your vet or a pet poison hotline right away, even if the exposure seemed tiny. Handle the cat gently and keep it calm on the way to care, and bring the tablets, spray, or patch packaging for dose estimation.
Common questions
My cat stepped on a nitroglycerin patch and groomed her paws — now what?
Call your vet or a pet poison hotline immediately. Patch residue absorbed through the mouth can drop a cat’s blood pressure enough to cause weakness or collapse.
What are the first signs of nitroglycerin exposure in a cat?
Watch for sudden weakness, stumbling, pale gums, and rapid breathing. Any of these after possible exposure warrants an immediate call — do not wait for collapse.
More medications hazards for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).