Side effects may include lethargy, difficulty exercising, low blood pressure which would cause fainting, weakness, or dizziness, loss of appetite, nausea, diarrhea, behavior change, and low blood sugar.
Atenolol may constrict the bronchi, resulting in coughing, wheezing, or difficulty breathing.
An improper dose of Atenolol can cause the heart rate to be too slow.
If your pet experiences an allergic reaction (symptoms may include swelling, hives, difficulty breathing, itching, etc.) or any of the above symptoms, contact your veterinarian.
Atenolol should not be used in pets with heart block, bradycardia (slow heart rate), and some types of heart failure. Use with caution in diabetic pets or those with kidney disease.
Use with caution in animals with some types of lung disease such as asthma.
Atenolol should not be used in pets allergic to it, or pets who have had reactions to other beta-blockers.
Possible interactions may occur with the following drugs: albuterol (Ventolin), anesthetic agents, cimetidine, epinephrine, furosemide, hydralazine, insulin, metaproterenol, nonsteroidal anti-inflammatories (ex. aspirin, carprofen), other heart medications (digoxin, diltiazem, verapamil), phenothiazines (tranquilizers), phenylpropanolamine, prazosin, and terbutaline.
Tell your veterinarian about any other medications, vitamins, or supplements that your pet is taking.