• Kyriaki Mystakidou, Emmanuela Katsouda, Eleni Tsilika, Efi Parpa, and Lambros Vlahos.
• Department of Radiology, University of Athens, School of Medicine, Korinthias 27, Athens 115 26, Greece. mistakidou@yahoo.com
• In Vivo. 2004 Sep 1; 18 (5): 633-42.

AbstractFentanyl, a surgical analgesic and general anaesthetic, is a lipophilic short-acting synthetic opioid, having a selective potent effect on mu receptors. The transdermal therapeutic fentanyl-system (TTS-F) allows for a continued and sustained titratable amount of fentanyl to be delivered without the inconvenience of the typical 24-h administration of other analgesics. Although incidences of respiratory depression led to TTS-F being contraindicated for postoperative analgesia, it is currently undergoing Phase III trials for nociceptive, neuropathic and chronic moderate to severe pain in a variety of settings. It demonstrates a slow pharmacokinetic profile and incidences of breakthrough pain may still require rapid analgesia, for which intravenous and bolus administration of rapid acting opioids remain 'gold standard' However, TTS-F is finding uses for chronic pain of cancer origin where it offers a solution for step 3-pain (WHO) management on the WHO analgesic ladder. More recent data indicates that TTS-F is not only effective for neuropathic but also nociceptive non-cancer and cancer pain alike. This review presents an overview of the synthesis, delivery, pharmacokinetics, toxicity and clinical pharmacology of the transdermal delivery of fentanyl.

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