I was just walking up the street and all of the sudden I hunched over b/c my heart was beating faster then I was accustomed too. I was in pain, scared, worried and had to get to the hospital. When I got there I told them that I thought I was having a heart attack, but it just turned out to be a tachycardia. My blood pressure was extremely high and they shot me up with some drugs to slow down my heart. I think one of the drugs was Verapamil. Like I said very scarey experience. Now before I am ever perscribed something I always ask what the side effects are. My luck is I always get the worse effects. Hope this helped again.