Also tell them if tenoretic venta you smoke, drink alcohol, or use illegal drugs. Take this medication exactly as prescribed by your doctor, even if your symptoms have disappeared. Ask your doctor or health care professional what your blood pressure should be and when you should contact him or her. Beta blockers may mask tachycardia occurring with hypoglycemia, but other manifestations such as dizziness and sweating may not be significantly affected. Dilutional hyponatremia may occur in edematous patients in hot appropriate therapy is water restriction rather than administration of salt except in rare instances when the hyponatremia is life-threatening. Significant beta-blocking effect of atenolol, as measured by reduction of exercise tachycardia, is apparent within one hour following oral administration of single dose.