Fentanyl Powder (also known as fentanil) with a rapid onset and short duration of action. It is a strong agonist at the μ-opioid receptors. Fentanyl is estimated to be between 50 and 100 times as potent as morphine.
Fentanyl Powder was first made by Paul Janssen in 1960,following the medical inception of pethidine (also known as meperidine, marketed as Demerol) several years earlier. Janssen developed fentanyl by assaying analogues of the structurally related drug pethidine for opioid activity. The widespread use of fentanyl triggered the production of fentanyl citrate (the salt formed by combining fentanyl and citric acid in a 1:1 stoichiometry), which entered medical use as a general anaesthetic under the trade name Sublimaze in the 1960s. Following this, many other fentanyl analogues were developed and introduced into medical practice, including sufentanil, alfentanil, remifentanil, and lofentanil.