I just wanted to ask anyone if you have taken antihistamine for hay fever and had palpertations that nearly bought on an AF attack. As I have Proxy AF and I am on beta blockers and clopidrogel. I took one table of flexafendine (antihistamine) given to me by my doctor. Last week I finally took one tablet and it gave me palpertations. Thought nothing of it and again took one this Monday and the same happened, but this time I was finding it hard to breath and I could feel I almost had an AF attack. Good job I took my meds as soon as I could. I did have to call paramedics as I was very scared and did not know why I was feeling like I was. And my blood pressure went up to 200/180. It did come down after I took my meds to 130/80. Most days my BP is anything from 127/75 to 114/72. My heart beat also went up to 98 which I know is ok but my normal heart beat is always between 55-70 tops. Thank god all was ok and I did not need to go to hospital. So you can imagine what I was feeling was not right. When I was diagnosed with PAF last September and put on these meds bisoprlol and clopidrogel I have been ok until now when I took these antihistamine. So I wanted to know if anyone else has got or been through it. And if so please be aware all antihistamines can give you an irregular/fast heart beat and palpertations. Frightening really and it's amazing how you become allergic to loads of things when you had been taking it for years before.... I had been taking citrazine last summer before I got diagnosed with PAF. I wonder now if it was that, that set my PAF of...They don't know but they did say it could be.