Alfentanil

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Alfentanil
Alfentanil-2D-skeletal.svg
Systematic (IUPAC) name
N-{1-[2-(4-ethyl-5-oxo-4,5-dihydro-1H-1,2,3,4-tetrazol-1-yl)ethyl]-4-(methoxymethyl)piperidin-4-yl}-N-phenylpropanamide
Clinical data
Trade names Alfenta
AHFS/Drugs.com Micromedex Detailed Consumer Information
MedlinePlus a601130
Legal status Controlled (S8) (AU) Class A (UK) Schedule II (US)
Routes Intravenous
Pharmacokinetic data
Bioavailability 100%
Protein binding 92%
Metabolism Hepatic
Half-life 90–111 minutes
Identifiers
CAS number 71195-58-9 YesY
ATC code N01AH02
PubChem CID 51263
DrugBank DB00802
ChemSpider 46451 YesY
UNII 1N74HM2BS7 YesY
KEGG D07122 YesY
ChEBI CHEBI:2569 YesY
ChEMBL CHEMBL634 YesY
Chemical data
Formula C21H32N6O3 
Mol. mass 416.517 g/mol
Physical data
Melt. point 140.8 °C (285 °F)
 YesY (what is this?)  (verify)

Alfentanil (R-39209, trade name Alfenta, Rapifen in Australia) is a potent but short-acting synthetic opioid analgesic drug, used for anaesthesia in surgery. It is an analogue of fentanyl with around 1/4 to 1/10 the potency of fentanyl and around 1/3 of the duration of action, but with an onset of effects 4x faster than fentanyl.[1] Alfentanil has a pKa of approximately 6.5, which leads to a very high proportion of the drug being uncharged at physiologic pH. This unique characteristic is responsible for its rapid onset. It is an agonist at mu opioid receptors.

While alfentanil tends to cause fewer cardiovascular complications than other similar drugs such as fentanyl and remifentanil, it tends to give stronger respiratory depression and so requires careful monitoring of breathing and vital signs. Almost exclusively used by anesthesiologists during portions of a case where quick, fast acting (though not long lasting) pain control is needed (i.e. during a nerve block, head pinning etc..) Alfentanil is administered by the parenteral (injected) route for fast onset of effects and precise control of dosage.

Alfentanil is a restricted drug which is classified as Schedule II in the USA, according to the U.S. DEA website.[2]

Alfentanil was discovered at Janssen Pharmaceutica in 1976.

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