There is a new form of Fentanyl available for breakthrough pain (BTP).

"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