Bisoprolol in high-risk patients undergoing vascular surgery reduced the perioperative incidence of death from cardiac causes and nonfatal myocardial infarction. Since beta1 selectivity is not absolute, the lowest possible dose of Atenolol tablet, USP, should be used with therapy initiated at 50 mg and beta2-stimulating agent bronchodilator should be made available. Some institutions require monitoring of baseline atenolol til at kobe and postinfusion heart rate and blood pressure when patient response to beta-blockade has not been characterized ie, the patient initial dose or following change in dose. Use of this medicine is not recommended if you have history of heart block, very low heart rate, very low blood pressure, uncontrolled congestive heart failure, or shock caused by heart failure. SIDE EFFECTS: You may experience dizziness, lightheadedness, drowsiness, tiredness, nausea, diarrhea, unusual dreams, leg pain, or vision problems as your body adjusts to the medication.