Atenolol is primarily prescribed to treat heart disease in cats and dogs. Atenolol decreases the heart’s need for blood and oxygen which reduces the amount of work the heart must do. It also helps the heart beat more regularly.


If you miss a dose ensure it is given as soon as possible, however, if it is almost time for the next dose then skip the missed dose and continue as normal. Ensure two doses are not administered together.

I have heard that this drug can have side effects, how will this affect my pet?

All medicines have potential side effects but this does not mean your pet has a high risk of experiencing them. Contact your veterinarian immediately if your pet becomes very tired, has trouble exercising, develops shortness of breath or a cough or if it’s attitude or behaviour changes.

Possible drug interactions

Ensure your vet is aware of any other medication you are giving your pet. Drug interaction is not uncommon when two differing medications are prescribed. The following drugs are known to interact with Atenolol: metaproterenol, terbutaline, epinephrine, phenylpropanolamine, anesthetic agents, phenothiazines, furosemide, hydralazine, insulin, calcium channel blockers (verapamil, diltiazem), and prazosin.