combined fentanyl, an opioid that has been used for over 20 years, with a transdermal drug
delivery system [Alza Corporation, Palo Alto, CA]. The system controls release of fentanyl to
maintain a continuous and steady supply of drug through the skin. Application of a new TTS
fentanyl every 72 h can provide the sustained and relatively constant serum fentanyl
concentrations associated with continuous intravenous or subcutaneous opioid delivery but …