Are you just taking an over-the-counter supplement?
I'm taking 20mg of Lovastatin and 500mg Niacin(Niaspan-KOS) daily on a prescription from my doctor. He tried to increase my Lovastatin to 40mg daily but I started having urinary problems. That's when he put me on Niacin and reduced by Lovastatin back to 20mg daily. My cholestorel was 199 when he made these changes.