Backflow of cerebrospinal fluid through a 25 gauge spinal needle after puncture of the arachnoid mater during initiation of spinal anaesthesia
A fentanyl nasal spray with a strength of 100 μg per use
Schematic drawing showing the principles of spinal anaesthesia.
A fentanyl transdermal patch with a release rate of 12 micrograms per hour, on a person's arm
US yearly overdose deaths, and some of the drugs involved. Among the more than 70,200 deaths estimated in 2017, the sharpest increase occurred among deaths related to fentanyl and fentanyl analogs (other ) with over 28,400 overdose deaths.
US yearly deaths involving other, predominantly fentanyl.
A package of 30 tablets, 600 mcg of fentanyl, each
Fentanyl powder (23% fentanyl) seized by a sheriff

Fentanyl is sometimes given intrathecally as part of spinal anesthesia or epidurally for epidural anaesthesia and analgesia.

- Fentanyl

Commonly opioids are added to improve the block and provide post-operative pain relief, examples include morphine, fentanyl, diamorphine, and buprenorphine.

- Spinal anaesthesia

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