Tell your doctor if you have or have ever had asthma or other lung severe an overactive thyroid gland hyperthyroidism heart slow heart circulation or heart or kidney disease. If any develop or change in intensity, kjope neste dag tenormin inform your doctor as soon as possible. Tenormin can pass into breast milk and may harm nursing baby. Atenolol, with B1 selectivity, has been used cautiously in bronchospastic disease with close monitoring. Because of its relative beta selectivity, however, TENORMIN may be used with caution in patients with bronchospastic disease who do not respond to, or cannot tolerate, other antihypertensive treatment. Your condition may become worse when the drug is suddenly stopped.