Alfentanil

Analgesik yang efeknya cepat dan kerjanya singkat yang berasal dari fentanil, digunakan sebagai garam hidroklorida pada industri dan sebagai tambahan dalam mempertahankan efek anestesi umum.

Alfentanil (Wikipedia)
Alfentanil
Alfentanil-2D-skeletal.svg
Clinical data
Trade names Alfenta
AHFS/Drugs.com Micromedex Detailed Consumer Information
MedlinePlus a601130
Routes of
administration
Intravenous
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability ~50%
Protein binding 92%
Metabolism Hepatic
Biological half-life 90–111 minutes
Duration of action 15 min
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
Chemical and physical data
Formula C21H32N6O3
Molar mass 416.517 g/mol
3D model (Jmol)
Melting point 140.8 °C (285.4 °F)
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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. 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 anesthesia providers 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.

Alfentanil was discovered at Janssen Pharmaceutica in 1976.

Side effects of fentanyl analogs are similar to those of fentanyl itself, which include itching, nausea and potentially serious respiratory depression, which can be life-threatening. Fentanyl analogs have killed hundreds of people throughout Europe and the former Soviet republics since the most recent resurgence in use began in Estonia in the early 2000s, and novel derivatives continue to appear.