All my doctors tell me it's unrelated, but I've been having my first skipped and abnormal beats of my life after I overdosed on amitriptyline. It started the day after I took too much of the drug by mistake and ended up in the ER with a fast heart rate during the day (160bpm, but it was a SOFT beat, not hard, which I now find strange). How is this possible to still be affecting me? It's been over a year and it's gotten really worse since then. I had a perfectly running heart till the OD. And a few months later I developed constant pounding in the 170s range, which I'm now on atenolol for. Atenolol slows it down, but no help with PVCs. I'd like to add they're positional skips, based on how I'm sitting or moving, or what kind of surface I'm sitting on. I am not accepting that it's not related as it all started during the same day of the OD. Skipping has gotten progressively worse since then, as well as pounding constantly if I don't take Atenolol. I'd like to know how did an amitriptyline OD cause this, and do you know anyone or have you experienced a drug causing permanent damage to your previously normal heart rate and beats? I am being treated like an idiot when I know this drug caused this, but no one believes me but my family. Could it have damaged cells in the heart that only an MP study could find?