Give this medication exactly as directed by your veterinarian. The usual dose and the frequency of administration is based on the condition and your pet's response to treatment. Do not stop giving atenolol abruptly unless you are directed to do so by your veterinarian. Stopping abruptly may make the condition worse. If you do not understand the directions ask the pharmacist or veterinarian to explain them to you. Atenolol can be given with or without food. Atenolol should be given with lots of water. Do not stop giving atenolol abruptly unless you are directed to do so by the veterinarian. Stopping abruptly may make the condition worse.