I have had two episodes of runs of PVCS, PACS trigerring tachycardia, one with a rate of almost 200bpm in the last three months with the most recent being a week ago. Both landed me in the ER because they scared the *** out of me. After the first I went to cardiologist, echo was normal, holter was ok whatever that means. Last MOnday I started taking 25mg of atenolol once daily. It has really helped the palps but it's killing my stomach. I have no appetite, terrible gas and I seem to be getting constipated. I'm also concerned about the weight gain that I've read about. I'm just wondering what others have experienced with this medication and if the stomach symptoms will get better with time. I truly don't want to stop taking it because I feel like I can actually relax and not worry so much about my heart flopping all around and taking off to the races. That part has been nice!