FDA now requiring stronger warnings on Chantix labels
July 1st, 2009 by Kurt Niland
The U.S. Food and Drug Administration announced today that it will require drug manufacturers to put boxed warnings on the product labeling for Chantix (varenicline) and Zyban (bupropion hydrochloride, otherwise called Wellbutrin when prescribed as an antidepressant). Both Chantix and Zyban, commonly prescribed to patients as smoking cessation aids, have been linked to serious behavioral changes and other symptoms. Agitation, hostility, depression, and suicidal thoughts and actions are possible side effects that users should be keenly aware of, the FDA warns.
“People who are taking Chantix or Zyban and experience any serious and unusual changes in mood or behavior or who feel like hurting themselves or someone else should stop taking the medicine and call their health care professional right away,” The FDA warns in its latest announcement.
The FDA also urges friends and family members to be observant of those using the medications, watching for behavioral changes in particular. The FDA said observers noticing such changes should “tell the person their concerns and recommend that he or she stop taking the drug and call a health care professional right away.”
Health officials are reluctant to withdraw smoking cessation drugs from the market even if the drugs prove to be dangerous for many people because smoking is the leading cause of preventable death in the U.S. Instead of an outright ban, they recommend taking the drugs with extreme caution.
In addition to boxed warnings on product labeling, the FDA will also require all adverse risks to be described in the drugs’ Medication Guides. The same regulations will also apply to generic versions of Zyban.
According to the FDA, analyses of both Chantix and Zyban users revealed disturbing patterns, noting that while many people stopped experiencing adverse affects once they discontinued the medication, others “continued to have symptoms after stopping the medication. Also, in a few cases, the problems began after the medication was stopped.”
The FDA also said it will require the drug manufacturers to conduct new clinical trials to determine how frequently serious neuropsychiatric symptoms occur in patients undergoing various smoking cessation therapies. To help discern whether the drugs cause the symptoms or merely exacerbate them, the trials will include patients with and without psychiatric disorders.
Chantix is manufactured by New York-based Pfizer Inc. Zyban is manufactured by GlaxoSmithKline, Brentford, Middlesex, United Kingdom.
Sources: http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm170100.htm
http://www.fda.gov/Drugs/DrugSafety/PublicHealthAdvisories/ucm169988.htm