As the pharmaceutical giant Pfizer was reminded in May, arriving first has its rewards, but they come with the risks of venturing into uncharted territory. This past spring the Federal Aviation Administration banned pilots and air traffic controllers from taking the company’s popular smoking -cessation aid, varenicline, which is sold in the U.S. as Chantix. Amid 6.5 million prescriptions written worldwide since 2006, the drug had spawned highly publicized reports of acute psychiatric episodes that included seizures, psychosis and suicidal depression . In May the nonprofit Institute for Safe Medication Practices documented 988 such “adverse events,” prompting the aviation ban.

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