[Usefulness of fentanyl patch (Durotep) in cancer patients when rotated from morphine preparations].

Background: [corrected] The transdermal fentanyl patch (Durote patch) is an opioid preparation requiring replacement once in three days, which is occasionally prescribed to replace morphine preparations. The conversion ratio from morphine to fentanyl has been claimed to be 100:1 or 150:1, but there may exist individual variations.

Methods: We retrospectively evaluated the analgesic effects and adverse effects of fentanyl patch in 24 cases among 22 patients (11 men and 11 women).