Heart, BP & diabetes · cat safety
Are beta-blockers toxic to cats?
Severe
No — beta-blockers (atenolol, propranolol, metoprolol) are dangerous if a cat swallows one. Vets use some in cats, but at cat doses; an overdose slows the heart, crashes blood pressure and can cause heart failure. Go to a vet now with the strip.
Why severe: Narrow margin of safety: even a small overdose can dangerously slow the heart and drop blood pressure (Pet Poison Helpline).
- Name
- Beta-blockers (heart and BP tablets)also Atenolol (Aten), Propranolol (Ciplar), Metoprolol, Bisoprolol, Nebivolol, Heart-rate, migraine and tremor tablets
What counts
Beta-blocker tablets and capsules, including slow-release (XL/SR) ones and combinations with other BP medicines.
What's in it
Beta-blockers block adrenaline's effect on the heart; too much slows the heart rate and weakens each beat (Merck).
Brands it hides in
- Aten and other atenolol tablets
- Ciplar (propranolol) — also prescribed for migraine, tremor and anxiety
- Metoprolol and bisoprolol strips, often marked XL or SR
- Combination BP tablets
Symptoms to watch for
- Lethargy, weakness
- Very slow heartbeat
- Low blood pressure — wobbliness or collapse
- Breathing difficulty
- Vomiting
Usually within 4 hours; effects can last 24–48 hours, longer with slow-release tablets (Merck).
What to do — now
Go to a vet now — don't wait for signs.
- Take the strip, and say if it is slow-release.
- Don't make your cat vomit at home unless a vet tells you to.
- At home: keep pill organisers shut and pick up dropped tablets at once.
Where Indian cats meet it
BP and heart tablets are a daily routine for many Indian elders, often in open pill boxes on the dining table — a dropped tablet becomes a cat toy.
Sources
- Pet Poison Helpline: Beta-blockers
- Merck Veterinary Manual: Toxicoses from cardiovascular medications
Facts last checked
General information for cat parents, not a diagnosis or a treatment plan. The facts come from ASPCA, Pet Poison Helpline, International Cat Care, the Merck Veterinary Manual and the other sources listed on every page — and we say so when the evidence comes from dogs or people. If your cat may have eaten something harmful, call your vet.