The cough, and sore throat are not symptoms of
Niaspan. So it sounds like more likely a virus. If you had an
allergic reaction to the antibiotics you would have had a rash, hives, swelling of the throat or breathing problems, something other than the symptoms you describe. A virus can make your stomach feel like it has been torn up. Stay hydrated. Hope this helps. Check out the diet on drmcdougall.com it lowered my husbands and my cholesterol a lot and helped with weight loss.