|Systematic (IUPAC) name|
|Licence data||EMA: , US FDA:|
|Protein binding||13% (in vitro)|
|Mol. mass||277.279 g/mol|
|(what is this?)|
Entecavir is a nucleoside analog (more specifically, a guanosine analogue) that inhibits reverse transcription, DNA replication and transcription in the viral replication process. The drug's manufacturer claims that entecavir is more efficacious than previous agents used to treat hepatitis B (lamivudine and adefovir).
Entecavir was approved by the U.S. FDA in March 2005.
Entecavir is used to treat chronic hepatitis B. It also helps prevent the hepatitis B virus from multiplying and infecting new liver cells. Entecavir is also indicated for the treatment of chronic hepatitis B in adults with HIV/AIDS infection. However, entecavir is not active against HIV.
The clinical efficacy of entecavir has been studied in several randomized, double-blind, multicentre trials. Oral entecavir was an effective and generally well tolerated treatment.
- 1992: SQ-34676 at Squibb as part of anti-herpes virus program
- 1997: BMS 200475 developed at BMS pharmaceutical research institute as antiviral nucleoside analogue à Activity demonstrated against HBV, HSV-1, HCMV, VZV in cell lines & no or little activity against HIV or influenza
- Superior activity observed against HBV pushed research towards BMS 200475, its base analogues and its enantiomer against HBV in HepG2.2.15 cell line
- Comparison to other NAs, proven more selective potent inhibitor of HBV by virtue of being Guanine NA
- 1998: Inhibition of hepadnaviral polymerases was demonstrated in vitro in comparison to a number of NAs-TP
- Metabolic studies showed more efficient phosphorylation to triphosphate active form
- 3 year treatment of woodchuck model of CHB à sustained antiviral efficacy and prolonged life spans without detectable emergence of resistance
- Efficacy # LVD resistant HBV replication in vitro
- Superior activity compared to LVD in vivo for both HBeAg+ & HBeAg− patients
- Efficacy in LVD refractory CHB patients
- “BARACLUDE® (entecavir) Tablets for Oral Use & Oral Solution. U.S. Full Prescribing Information.” Bristol-Myers Squibb Company, 2005. Revised December 2013. 
- Sims KA, Woodland AM (December 2006). "Entecavir: a new nucleoside analog for the treatment of chronic hepatitis B infection". Pharmacotherapy 26 (12): 1745–57. doi:10.1592/phco.26.12.1745. PMID 17125436.
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- Lai, C. L. et al. Entecavir versus lamivudine for patients with HBeAg-negative chronic hepatitis B. N. Engl. J.Med. 2006. 354:1011–1020.
- Sherman, M., C. Yurdaydin, J. Sollano, M. Silva, Y. F. Liaw, J. Cianciara, A. Boron-Kaczmarska, P. Martin, Z. Goodman, R. J. Colonno, A. Cross, G. Denisky, B. Kreter, R. Hindes, and the AI463026 Behold Study Group. Entecavir for the treatment of lamivudine-refractory, HBeAg-positive chronic hepatitis B. Gastroenterology 2006. 130:2039–2049.