I take both Verapamil and the d3 regimen. Verapamil around 6am and d3 between 12 and 1pm. I took prednisone about 3 or 4 years ago and just got my brand new hip! The only thing that the doc could think to pin the hip replacement on was the prednisone. I'm 43 years old. Be careful with that stuff. Dont over do it. It will keep most of the clusters away only when your taking it. Stop taking it and the clusters return. Just my experience.