Nursing Mothers Atenolol is excreted in human breast milk at ratio of. The frequency estimates in the following table buy tenormin in the uk were derived from controlled studies in hypertensive patients in which adverse reactions were either volunteered by the patient US studies or elicited, eg, by checklist foreign studies. Try not to miss any doses, especially if you are taking Tenormin once day. This should include measurement of blood pressure just prior to the next dose trough blood pressure to ensure that the treatment effect is present for full 24 hours. Be careful if you drive or do anything that requires you to be awake and alert. Your doctor can and may use Tenormin with other high blood pressure medications. The following symptoms are uncommon, but if you experience any of them, call your doctor immediately: shortness of breath swelling of the hands, feet, ankles, or lower legs unusual weight gain fainting Atenolol may cause other side effects.