I have been taking atenolol for 3 days now. I am taking a half of a 25 mligram dose. I have been feeling weird, really cranky, agitated, and my asthma is acting up my cough has been worse. I feel so ansy, agitated and can't relax right now. Is it the atenolol? I have no reason to feel this way so I do not know what is causing it. Does atenolol cause hypoglycemia? I remember I used to take celexa for anxiety but that caused me to get hypoglycemia so I stopped taking it. I hope this medicine doesn't cause it. What are your experiences and opinions on atenolol?