Debby , I also take the Niaspan as prescribed by my carido. doc. , he was aware of this side effect and slowly upped my dosage and still is increasing it . He said with the burning I suffered with RSD it would be to much to start with the rx he wanted to start with and I should slowly increase as I can tolerate it . I surely know of the flushing and hot feeling you speak of . Fortunately my cardio. doc. was aware of this side effect and took this into consideration . Hope this works for you ! Take care