"Onsolis contains fentanyl in a small film (about the size of a dime or nickel) that sticks to the inside of your cheek."
http://www.fda.gov/Drugs/DrugSafety/PostmarketDrugSafetyInformationforPatientsandProviders/ucm172039.htm
The "film" sounds similar to those breath mint, film Listerines (Breath Strips).
Only available to cancer patients.
edit/g
