Ray, here is a link to the Niaspan. I've taken plain Niacin and had the flushing, and didn't get along with it too well, but I've really heard some good things about this one!
By the way, re the Imdur, it, too is a great medication for Angina, unless you have a low Blood Pressure to begin with.
I'm glad to see that you and these particular med.'s are getting along, Ray, as they obviously seem to be making you feel better and that's what it's all about with this angina~especially when they know your main arteries are clear and it's the CAD or small vessel disease causing this! Best wishes to you!