Niaspan ER and hives

I took increasing amounts of Niaspan for a number of years and experienced the flushing that even at its worst soon passed each time. But earlier this year, while on 1000 mg, I suddenly experienced terrible itching after showering, even after taking cool showers. It was maddening, as sometimes after a shower, there was no side-effect. When it reached the point one day that I had hives, I stopped Niaspan. I have been off the medication for about 4 months. Two weeks ago, I started up again at 500mg. I have been ok with no flushing. Today, after a cool shower, I experienced a bout of severe itching on my legs. I don't know what to do. I can't tolerate the itching but my HDL has already gone lower than before. Any ideas?

For a year and half my physician had me on 500 mg a day. In november he had me take 1000 mg a day. Within three days my hands and feet swelled to twice their size. My skin on my hands, feet and face felt like they were burning. I also suffered from hives. I stop taking the niaspan and yet six weeks later I still get the above side effects. I know of another three people who suffered similar side effects. Are there others who have had the same experiences and how long did the side effects last.

Take care,
Mike