Adefovir dipivoxil

UsesHas a broad spectrum of antiviral activity, can be used for the treatment of chronic hepatitis B.

DescriptionAdefovir dipivoxil is the first nucleotide analog to be launched in the US as an oral treatment for hepatitis B virus (HBV) infections. It can be easily prepared in 4 steps from adenine. Adefovir dipivoxil acts as a bioavailable ester prodrug which is rapidly hydrolyzed to free adefovir and further anabolized to its active form, adefovir diphosphate, by two intracellular phosphotylation steps. The diphosphate competitively inhibits reverse transcriptase and/or causes chain termination when incorporated into growing DNA. Adefovir dipivoxil has a broad antiviral spectrum against retro-, herpes- and hepadnaviruses. The drug inhibits HBV replication, decreases HBV DNA levels and improves liver histology of patients infected with HBV wild type and resistant to other antivirals such as lamivudine. It also demonstrated activity in hepatitis B”e” antigennegative, or precore mutant, patients and in patients co-infected with HIV. To date, no adefovir dipivoxil-associated resistance mutations have been identified in patients up to 136 weeks with the drug. The oral bioavailability of adefovir after oral administration of its dipivoxil prodrug is approximately 30%. It is mainly excreted unchanged in the urine and its plasma elimination half-life is 4.2 h. However, a long intracellular half-life (17 h) of the active bisphosphorylated metabolite enables once-daily dosing. The most prominent adverse effect of adefovir dipivoxil is nephrotoxicity (which has prevented the drug from being marketed for HIV infections where the drug required administration at higher doses).

UsesAdefovir Dipivoxil(Preveon, Hepsera) works by blocking reverse transcriptase, an enzyme that is crucial for the hepatitis B virus (HBV) to reproduce in the body. It is approved for the treatment of chronic hepatitis B in adults with evidence of active vir

UsesA nucleotide analog, useful as an oral reverse transcriptase inhibitor (ntRTI).

General DescriptionAdefovir is an orally active prodrug that is indicated for thetreatment of the chronic form of hepatitis B. The dipivoxil moieties are hydrolyzed by ubiquitous esterases to yieldadefovir, which is phosphorylated by adenylate kinase toyield adefovir diphosphate. This compound is inhibitory atHBV DNA polymerase. In addition, adefovir undergoes incorporationinto viral DNA and causes chain termination.Adefovir is poorly absorbed by the oral route, but the dipivoxilester groups cause the bioavailability to increase toapproximately 60%.

DefinitionChEBI: Adefovir pivoxil is an organic phosphonate that is the dipivoxil ester of adefovir. A prodrug for adefovir, an HIV-1 reverse transcriptase inhibitor, adefovir pivoxil is used to treat chronic hepatitis B viral infection. It has a role as a prodrug, an antiviral drug, a DNA synthesis inhibitor, a HIV-1 reverse transcriptase inhibitor and a nephrotoxic agent. It is an organic phosphonate, a member of 6-aminopurines, an ether and a carbonate ester. It is functionally related to an adefovir.