My husband takes both and one of them is causing him to burn up and night.
Answers (1)
Niaspan can cause side effects, such as flushing (warmth, itching, redness, or tingly feeling under your skin). These effects can be made worse if you drink alcohol or hot beverages shortly after you take Niaspan. These effects should disappear over time as you keep taking the medication.
Take Niaspan with a full glass of cold or cool water. Taking the medication with a hot drink may increase your risk of side effects such as flushing.

He's been on Niaspan for years and the flushing is getting worse! The doctor has him taking his Crestor at the same time, could this be the problem? He's always taken both together.