I have done that when mine was high and then gone back to regular
dosing. I hope you find the problem quickly. Let us know what you find out if you feel it would be of help to others on this drug. BTW, I am doing better on 1/2 of a 25 mg. Atenolol at night and nothing thru the day. My heart rate is up a little and I am not used to that, so I'm feeling a little hyper. I am hoping it will level out and I will feel more energetic. My dizzy spells are also less.