A study published in 2006 found that off-label use was the most common in cardiac medications and anticonvulsants. This study also found that 73% of off-label use had little or no scientific support.
In 1993, the US FDA approved gabapentin, marketed by Pfizer under the name "Neurontin", only for treatment of seizures. Pfizer subsidiary Warner-Lambert used activities not usually associated with sales promotion, including continuing medical education and research, to promote gabapentin, so that within 5 years the drug was being widely used for the off-label treatment of pain and psychiatric conditions. In 2004, Warner-Lambert admitted to charges that it violated FDA regulations by promoting the drug for pain, psychiatric conditions, migraine, and other unapproved uses. The company paid $430 million to the federal government to settle the case.
Access to pharmaceutical industry documents have revealed marketing strategies used to promote drugs for off-label use. The United States federal government is aggressively pursuing criminal and civil cases against pharmaceutical companies and their employees for promoting off-label uses of prescription drugs. Between 2003 and 2008, U.S. federal prosecutors and state attorneys general brought more than a dozen cases against drug makers for off-label marketing and won more than $6 billion in criminal and civil settlements. In September 2009, Pfizer paid $1.3 billion, the largest criminal fine ever imposed in the United States, for the off-label marketing of Bextra and three other drugs. Pfizer paid an additional $1 billion in civil penalties resulting from the same illegal activities