Nicotinic acids are used to treat high cholesterol, reduce the risk of heart attack, and manage atherosclerosis (hardening of the arteries). Nicotinic acids work by reducing the production of bad cholesterol (LDL) and triglycerides while increasing good cholesterol (HDL) in your blood. These medications are available in different forms, including extended-release and immediate-release oral tablets. Examples include niacin ER and niacin (Niacor). You can choose the form that best fits your needs.