I just want to make some people aware of some of the problems that can crop up when being prescribed amitriptyline by your GP or pain specialist. I found this out all to my own cost..which nearly cost my life. I had no idea that amitriptyline can interfere and cause problems with arrythmia in the heart..I recently had a cardiac arrest where my heart stopped but luckily enough for me I had someone in the same store I was shopping in who was able to perform CPR until the paramedics arrived...I was given two shocks on a defribrillator then flown by air ambulance to hospital where they could deal with my critical medical condition. Whilst in hospital I underwent a lot of extensive tests where they showed I had a long term and potential critical heart condition..the medication I was on did not help that condition...! I have now been taken off amitriptyline and venaflaxine and my GP is going to have to look at what other suitable meds will be ok for me to take. I am recovering at home now after having an ICD fitted..BUT I am so glad that someone was there on the original scene to help keep me alive..I have no idea what my future has ahead...I am on paracetamol for pain till an alternative medication can be found that will help me cope with FMS and wont interfere with my heart condition...So if you suspect you have heart condition or there is a family history of heart conditions..do mention this to your GP or pain specialist before embarking on long term medication such as Amitriptyline..Because I would not like this to happen to anyone else..