Hello, Dr.Grief My name is Josephine. I am 51 y/o female. I would like to know how is lopresser useful on a prn basis when symtoms of palpitations occur and is this a common way to use this medication. my cardiologist indicated lopressor after a 24 hr holter monitor showed pvc while asleep, my chief complaint was palpitaitons at rest mostly at night, no chest pain. I am hasitating to take this medication due to all the side effects it has, specially when the palpiations were said to be insignificant. I have made some life style modification such as exercise, eating better and healthier, taking vitamins, omega 3 in hope that this may help. looking foward to you feedback, thank you