I was recently diagnosed with PSVT and my doctor prescribed me 25 mg of atenolol 1 x daily. I know this medication is supposed to lower your heart rate & blood pressure. My normal BP is anywhere from 105/59 to 133/80 it just varies & my normal resting HR is about 75 without the medication. I'm just extremely worried about this medicine causing it to go too low! Last night I took 1/4 of the pill it didn't have any effect on my PSVT but I didn't feel the pounding & it made me calm & sleepy & I did notice at night my resting HR was 68. It's never been that low before & it freaked me out so I didn't take the medication & I woke up with a HR of 120. I really don't know what to do anymore. I don't want the PSVT but I don't want to take this scary medication & I'm not really getting a good answer from my cardiologist. Im TERRIFIED!