<http://schema.org/description>
"FENTANYL  is a pain reliever. It is used to treat breakthrough cancer pain that your long acting pain medicine does not control. Do not use this medicine for a pain that will go away in a few days like pain from surgery, doctor or dentist visits. The medicine is used only by people who have been taking an opioid or narcotic pain medicine for at least a week."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.goodrx.com/subsys/what-is>