I take 25 mg atenolol b.i.d. along with 1 mg Xanax and 0.1 Clonidine. Obviously, my pulse hangs out around 50. I can t remember if I took the Atenolol this evening. I have tachycardia and paroxysmal hypertension so I m concerned about going without it, but also reducing my pulse too far in my sleep.