Hi,,I'm a pain patient and been on Methadone for over a year,,,I have no known heart issues that I know of,,,But my heart is acting strange beating feels off not like extra heartbeats I've had those before with no reason found why,,years ago,,but I just want to know if u did have any heart stuff while on methadone,,,and no worries if I for a moment i thought I was having a heart attract I wd call 911 immediately, just want to see how common that is,,thanks everyone..