FAA bans anti-smoking drug Chantix for pilots, air controllers

washington – The Federal Aviation Administration today banned pilots and air traffic controllers from using a popular new anti-smoking drug after a medical safety group warned that the medication had apparently contributed to auto accidents and other mishaps that posed risks to both users and others.

The drug, called Chantix, had been hailed as an innovative treatment to help smokers quit. But a report from a medical safety group – also issued today –linked the medication to a variety of unusual and serious side effects, including loss of consciousness and seizures, and prompted the FAA to act, said spokesman Les Dorr.

The agency had approved the drug last summer, before drug safety regulators began investigating reports of serious psychiatric problems, including suicidal behavior, sharp shifts in mood and vivid nighttime episodes some patients call “Chantix dreams.”

The warning was contained in a report by the Institute for Safe Medication Practices based on an analysis of “adverse events” reports submitted to the Food and Drug Administration.

“We have immediate safety concerns about the use of [Chantix] among persons operating aircraft, trains, buses and other vehicles, or in other settings where a lapse in alertness or motor control could lead to massive, serious injury,” the study said.

It remained unclear whether other federal safety agencies would follow the FAA’s example.

The study also cited a range of other serious reported side-effects, including vision problems, heart rhythm disturbances, seizures and skin reactions. The nonprofit group that conducted the study advises hospitals and doctors on the prevention of medication errors, and is based near Philadelphia.

“These data provide a strong signal that the risks of [Chantix] treatment have been underestimated, and show that a wide spectrum of serious injuries are being reported in large numbers,” the report said.

Prescription drugs are usually tested on a few thousand people before approval, but serious problems many not emerge until many more patients have used the medication for a sustained period.

Responding to the study, FDA spokeswoman Susan Cruzan said: “We agree that these findings are a signal that requires further investigation and confirmation, and the FDA has been conducting a review of the adverse events associated with Chantix.”

The agency has recently issued warnings about the mental health effects of the drug, as well as the possibility that taking it could impair driving.

Manufacturer Pfizer strongly defended Chantix. Smoking “is one of the largest problems we face in the world,” said Dr. Anjan Chatterjee, a Pfizer medical director. “When you think about it in that perspective, the risk-benefit analysis is still substantially toward benefit. Even medications most people consider innocuous have side effects.”

Chantix has become a top seller for Pfizer since its approval in May 2006. It acts at sites in the brain affected by nicotine, providing some of the effects of nicotine to ease withdrawal symptoms and blocking the effects of nicotine if smokers take up the habit again, according to the FDA.

A month’s supply of the drug costs $130, and treatment can last from three to six months. More than 3.5 million people in the United States have used the drug.

But Chantix gained notoriety last fall when a Dallas-area rock musician named Carter Albrecht was shot to death as he pummeled a neighbor’s door in the middle of the night. Albrecht’s family and his girlfriend blamed the 34-year-old musician’s outburst on his taking Chantix.

The medical examiner found Albrecht was intoxicated with alcohol, but investigators were unable to test for the prescription drug. The FDA launched its own review, which led to warnings about the suicide risks.

The most recent warning, issued Friday, advised patients to stop taking Chantix and immediately call the doctor if they experience agitation, depression, behavior changes or suicidal thoughts.

The safety group’s lead researcher, Thomas J. Moore, said the FDA has not gone far enough. “We would not have written this report if all we had seen were the psychiatric effects, because the FDA has already issued a public health advisory on that,” he said. “The non-psychiatric elements are the ones that concern us.”

Moore said the concerns about Chantix came from a data monitoring program that the group has launched to help identify emerging drug risks. It tracks quarterly reports to the FDA of serious side effects that were not detected in testing before a medication’s approval.

By the end of 2006, Chantix registered among a relatively small group of 35 drugs out of all medications that accounted for 100 or more reports of serious harm per calendar quarter. Other medications in this group tend to be powerful painkillers and various kinds of drugs that affect the immune system.

By the middle of last year, Chantix ranked third among all drugs in reported problems. It moved into first place in the last quarter of 2007, with 988 reports.

The study identified 173 accidents involving Chantix that resulted in injuries. Falls accounted for the largest category, with a total of 77 cases. There were also 28 traffic accidents. The potential causes included loss of consciousness, dizziness, confusion and muscle spasms.

Dr. Martina Flammer, a Pfizer medical director, said the company’s own analysis does not appear to indicate a significant problem for drivers.

“The current post-market reporting rate in regards to impaired driving ability for patients taking Chantix is not higher than the reported rates associated with all other medicines in the FDA databases,” she said.

Aviation officials said they were not aware of any accidents involving Chantix. The FAA generally places tight restrictions on the use of mood-altering medications by pilots. Anti-depressants, for example, are banned.

 ricardo.alonso-zaldivar@latimes.com