i was on the same medication and it slowed my heart rate down, I mean way down. At one point I had headaches because due to the medication my heart wasnt pumping enough blood to my brain. They put me on Tylenol for headache but after while I got dependence on them. The only way I could stop that was to go cold turkey and deal with the headaches. They soon went away. I was later referred to a neurologist for my headaches because they kept coming back and she told me not to take tylenol more than three days because they can mess up your liver and other issues. Of course, we are all different and our bodies react differently. If your heart rate goes too low, check with your doctor and ask him about it and if he can put you on another medication that will not slow your heart rate down. However, consider the fact that if your heart is beating too fast, that's another situation.