Is Tums (Calcium carbonate) Safe for Cats?
Why it’s conditional
Calcium carbonate is low in toxicity, so small accidental amounts seldom harm a cat. The concern is that cats are small and cats with kidney disease handle calcium poorly, so even modest amounts can shift their balance. Tums also do nothing useful for the causes of feline vomiting, which are often medical rather than acidic.
How to keep your pet safe
Keep antacid bottles where a cat cannot push them off a counter, and never dose a cat with human antacids. If your cat vomits or seems off, a veterinary exam beats any home remedy.
Warning signs to watch for
Usually none or mild drooling; larger ingestions can cause vomiting, constipation, and lethargy, and cats with kidney disease can develop calcium-related illness.
When to call the vet
Call your veterinarian or a pet poison hotline if more than a lick or a single tablet was involved, and sooner for a cat with kidney disease. Persistent vomiting in a cat needs an exam.
Common questions
My cat ate half a Tums tablet — is that bad?
Half a tablet of plain calcium carbonate is unlikely to harm a healthy cat, so a call to your vet or a poison hotline for reassurance is enough. A cat with kidney disease should be mentioned by name when you call.
Why is Tums a worse idea for cats than dogs?
Cats are smaller and many have hidden kidney issues that make calcium balance fragile. Tums also do not treat the real causes of feline stomach upset.
My cat keeps eating my Tums — what should I do?
Move them into a closed cabinet or lockbox and stop leaving doses out. Repeated calcium ingestion can cause constipation and imbalance even at low toxicity.
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).