Use caution in patients with cardiovascular disease (arrhythmia or hypertension or heart failure), convulsive disorders, diabetes, glaucoma, hyperthyroidism, or hypokalemia. Beta-agonists may cause elevation in blood pressure, heart rate, and result in CNS stimulation/excitation. Beta2-agonists may increase risk of arrhythmia, increase serum glucose, or decrease serum potassium.