Off-label prescription and physician knowledge (or lack thereof)

From the New York Times article "Disparities: Study Finds Risk in Off-Label Prescribing":

Physicians are allowed to use drugs in ways that are not specifically approved by the Food and Drug Administration, a practice called off-label prescribing. There is usually less scientific evidence to support nonapproved uses, and a new survey of physicians has found that many might not even know when they are prescribing off label.

Click here to access the NYT article. Click here to access the peer-reviewed article published in Pharmacoepidemiology and Drug Safety (sub. req.).