http://www.medications.com/effect/view/8057 I have been on Atenolol for about 7 years now - 25mg. At first I found it made me feel tired and slowed me down too much, however, I decided to cut it in 1/2 and take 1/2 in the am and 1/2 in the pm and this seems to work much better. In fact, when I to