Fentanyl patches offer a continuous dose and last 72 hours. According to the National Institute of Health, the normal IV dose for post-operative pain control is 50 to 100 mcg every 1 to 2 hours as ...

The dosage of fentanyl was increased to 50 µg/h in an attempt to prevent breakthrough pain. However, at this dosage she reported some somnolence, such that the patch strength was reduced back to ...