Here is some information I ran across today while checking out a chronic pain board. This information is courtesy of Ortho-McNeil's website, and will include a link at the end.
ALZA Corporation Receives FDA Approval for
IONSYSTM (fentanyl iontophoretic transdermal system)
The First Needle-Free, Patient-activated Analgesic System for Acute Postoperative Pain
Mountain View, CA, May 23, 2006- The US Food and Drug Administration (FDA) has approved IONSYSTM (fentanyl iontophoretic transdermal system), the first needle-free, patient-activated analgesic system. IONSYS is indicated for the short-term management of acute post-operative pain in adult patients requiring opioid analgesia during hospitalization.
IONSYS is the first and only product to incorporate the proprietary E-TRANS® iontophoretic transdermal drug delivery system developed by ALZA. E-TRANS utilizes iontophoresis - a process in which a low-intensity electric field, which is generally imperceptible to the patient, is used to rapidly transport fentanyl across the skin and into the circulatory system of the body. IONSYS securely adheres to the upper outer arm or chest, and provides patients an on-demand dose of fentanyl. Fentanyl is an opioid analgesic that has been used in the management of pain for more than 40 years. Read more via this link