If you're on a multi-vitamin regiment, read on.
New details from two studies reveal more side effects from niacin.
Many Americans take the drug for general heart health and for cholesterol problems in place of, or in addition to, statin medicines such as Lipitor.
But some doctors say the drug now seems too risky for routine use.
Details in this week's New England Journal of Medicine suggest that deaths, bleeding, infections, gastrointestinal and other problems are more common among niacin users.
However, heart specialists say no one should stop taking any drug without talking with a doctor.