Diaz Del Consuelo, Isabel Transport of fentanyl through pig buccal and esophageal epithelia in vitro: influence of concentration and vehicle pH. [electronic resource] - Pharmaceutical research Sep 2005 - 1525-9 p. digital Publication Type: Journal Article ISSN: 0724-8741 Standard No.: 10.1007/s11095-005-6020-y doi Subjects--Topical Terms: Analgesics, Opioid--pharmacokineticsAnimalsCheekEsophagus--metabolismFentanyl--pharmacokineticsHydrogen-Ion ConcentrationMouth Mucosa--metabolismSwine