Study: No suicide risk for anti-smoking pills Chantix, Zyban

TRENTON, N.J. (AP) - Seven years after U.S. regulators slapped their strictest warning on two popular smoking-cessation medicines citing risks of suicidal behavior, a large international study found no such risk.

Now Chantix maker Pfizer and Zyban maker GlaxoSmithKline hope the Food and Drug Administration, which ordered them to do the study, will remove the so-called "black box warnings" put on their prescription drugs due to anecdotal patient reports of serious psychiatric side effects.

Study: No suicide risk for anti-smoking pills Chantix, Zyban