I had triple bypass heart surgery and two bypasses failed. I was put on diltiazem to help two laterials that grew is my heart to the closed area.I have been on it for a year or so and now I am so weak that I can hardly walk, and other symptoms. I spend most of my time in bed. I can t exercise because I am too weak. I chose to stop taking the medication and I am feeling so much better. I haven t told my cardiologist yet. I am watching my blood pressure closely and so far no problems. Is there a natural substance to keep my blood pressure in check? (Age 71 female)