I've been taking atenolol 25mg for about a year now for tachycardia and palpitations. I've gained about 20 lbs while on atenolol and have been bloated. My primary doctor decided to switch me to Bystolic due to side effects. Says that Bystolic is newer and has very few side effects. I'm reading that Bysyolic is used mainly for High blood pressure and I do not have issues with that. I'm sure Bystolic will help with tachy and palpitations but I wanted to see if anyone had reviews??