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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).

MP 249-252°C
storage temp.
-20°C Freezer
Hepatitis B treatment first-line drug Entecavir is a new generation of guanine nucleoside analogues oral medicine for treatment of hepatitis B virus infection in, mainly for the treatment of adult patients with viral replication activity and serum transaminase continued to increase, or liver tissue for pathological activity of chronic hepatitis B, is currently down virus the fastest and the most powerful, the mutation rate lowest nucleoside analogues.
Data show that different in patients with chronic hepatitis B, including nucleoside naive and nucleoside treated and liver cirrhosis patients, using well entecavir tablets in the treatment can control the disease rapidly and easily reach the treatment of reality end, namely the hepatitis B virus unmeasured; through adherence to treatment, a considerable portion of patients can be arrived at the end of treatment satisfaction, namely e antigen serology conversion, some patients can even reach the ideal for the treatment of end, namely surface antigen negative.
mechanism of action This product is guanosine analogue, having inhibiting effect to hepatitis B virus (HBV) polymerase. It can change to the active phosphorylation by three phosphate, the half-life of three phosphate in cells is 15 hours. The natural substrate DNA guanine nucleoside and HBV polymerase three phosphate competition, entecavir three phosphate can inhibite of viral polymerase (reverse transcriptase) of all three activities: (1) HBV polymerase promoter; (2) the formation of before genomic mRNA reverse transcription negative strand; (3) HBV DNA chain is synthetised. Entecavir three phosphate on the inhibition constant HBV DNA polymerase (Ki) 0.0012 μM. entecavir three phosphate on cell entecavir α, β, δ DNA polymerase and mitochondrial DNA polymerase inhibition. Ki value is 18 to 160μM.
side effect In the treatment of hepatitis B, entecavir as first-line antiviral drugs in the treatment of hepatitis B virus on the effect is worthy of recognition, have a significant treatment effect of serum transaminase ALT increased or liver lesions for active viral replication in patients with chronic hepatitis B in adults,. However, the clinical application of entecavir is affected due to the side effects of entecavir. The most common side effects of entecavir: the increase of ALT, fatigue, dizziness, nausea, abdominal pain, abdominal discomfort, abdominal discomfort, liver, muscle, insomnia, rubella and indigestion, also be found in neutrophils decreased slightly. These adverse reactions were mild to moderate. In trials with lamivudine controls, the incidence of adverse events is equivalent to lamivudine.
According to the study, it also found that, as the same type of antiviral drugs, entecavir and the first generation of antiviral drugs have similar side effects, such as acid poisoning, hepatomegaly, liver fatty degeneration in the withdrawal will appear rebound phenomenon. In these studies, using entecavir of the patients in the treatment process, ALT increased to 10 times of the normal value upper limit and baseline values of 2 times, the generally continue to medication for a period of time, the ALT returned to normal; prior to or concurrently with viral load 2 on the numerical decline. So during the treatment, regular liver function should be tested.
In the side effects of entecavir, most not easy to accept the resistance for patients, resistance will increase the difficulty of treatment, medication time to grow, for patients, psychological pressure and economic pressure will increase, half-way stopping may cause illness rebound. Although existing nucleoside analogues inhibited viral force of entecavir is strong, and mutation rate is lowest (newly diagnosed 4 years less than 1%), but the price is also the most expensive, more suitable for economic conditions, long-term treatment.
Because of the side effects of entecavir, patients with hepatitis B should be taken entecavir under the guidance of specialized subject doctor, once appear uncomfortable to reflect to the doctor. In the necessary condition, timely adjustment of treatment. And the use entecavir therapy does not reduce hepatitis B through sexual contact or blood transmission of hepatitis B virus risk. Therefore, it is necessary to take appropriate protective measures.
usage and dosage Patients with chronic hepatitis B should be under the guidance of experienced doctors taking this product. Recommended dosage: adult and over the age of 16 young oral this product, once a day, each 0.5 mg. lamivudine treatment viremia or patients with lamivudine resistant mutants to once a day, each 1.0 mg (0.5mg two pieces), taken on an empty stomach (a meal or a meal after at least 2 hours).
Adefovir dipivoxil Adefovir dipivoxil regulates the immune system and let the immune system to attack liver cells of the intrusion of HBV , and clear the virus, but this method will develop resistance, at the same time for patients with renal dysfunction or potential renal dysfunction risk, the use of adefovir dipivoxil chronic treatment will lead to renal toxicity. If eating 1 mg every day, in the three months will produce nephrotoxicity, this will lead to severe renal failure. These patients should be closely monitoring renal function and making appropriate dosage adjustments.
Bisphosphonates is quick conversion of adefovir dipivoxil in vivo, adefovir dipivoxil is a kind of single adenosine monophosphate acyclic nucleoside analogues, became to activity of the metabolites of adefovir in cellular kinases by phosphorylation in cellular kinases. A Duff Vee two phosphate through the following two ways to suppress HBV DNA polymerase (reverse transcriptase); one is with the natural substrate of deoxyadenosine triphosphate competition, the second is the integration of viral DNA and induce DNA chain elongation terminated. A Duff Vee two phosphate to HBV DNA polymerase inhibition constant (KI) is 0.1μM, but of human DNA polymeraseα and γ is weak and Ki values were 1.18μM and 0.97 μM.
Anti-viral activity: in the human hepatoma cell line transfected with HBV, the concentration of A Duff Vee inhibited 50% viral DNA replication (IC50) is from 0.2 to 2.5uM.
Adefovir dipivoxil applies for the treatment of hepatitis B virus replication activity and serum amino acid transfer enzyme and persistently elevated liver decompensation adult patients with chronic hepatitis B patients.
Liver injury is often encountered in the course of hepatitis B treatment, hepatitis B therapy is inappropriate, as well as long-term use of drugs on the liver damage, will lead to the occurrence of liver damage.
After long-term taking adefovir dipivoxil tablets, once the withdrawal will aggravate the damage of liver function. Therefore, for stopping taking the patients should be monitored for liver function.
Adefovir dipivoxil is more moderate suitable for long-term use, suitable for patients with lamivudine resistant patients, their chances of producing drug resistance is small, because the amount is less, side effects are small.
Entecavir is new, antiviral effect is also strong, if not treated with lamivudine, the possible resistance is the smallest, but it and lamivudine have cross resistance, if treated with lamivudine to take entecavir produced resistance rate is much greater.
Genotoxicity In the study of reproductive toxicity, in 4 consecutive weeks of entecavir, dose up to 30mg/kg, the dosage of 90 times more than the recommended dose of 1.0mg/ day, the highest body did not find the fertility of male and female rats affected. In toxicology of entecavir studies, when dose is 35 times of body dose or more, found the dog rodent animal appeared degenerative changes. The vas deferens in the monkey experiments, no changes were found in testis. Study on reproductive toxicity in rats and rabbits, the oral dose of 200 and 13mg/kg/ day, which is equivalent to 28 times of the highest dose 1.0mg/ day (in rats) and 212 times (for rabbit), no embryo and maternal toxicity. In rabbits, the dosage of female rabbits is 883 times the daily dose of 1.0mg/ in the human body, the observed toxic effects on embryo fetal rabbit (absorption), reduce the level of ossification (tongue Bone), and the 13th rib occurrence rate increased. In the practical before birth and after birth of rats oral clinical trials converted that card quantity is greater than 94 times of people 1.0mg/ a daily dose, having not to impact on future generations. Entecavir can be from rat milk secretion.
Usage An oral antiviral drug used in the treatment of hepatitis B infection. A guanine analogue that inhhibits all three steps in the viral replication process
Inspection Items Accepted Standard Results
Appearance White to off-white  powder Complies
Optical rotation +24.0°—+28.0°(DMF:MeOH=1:1 c=1%) +26.8°
Identification A: By IR, To match with working standard
B: By HPLC,retain time should match with working standard


Water 5.8%—6.5% 6.1%
Isomer Single ≤0.1%
Total  ≤0.5%
Related Substances Single impurity ≤0.1%
Total impurities ≤0.3%
Granularity Particle size
D50≤6.0μm    D90≤12.5μm
Residue on ignition ≤0.1% 0.06%
Heavy metals ≤20ppm Complies
Residual  solvents Should be to match with the standard Complies
Assay ≥99.8% 99.9%
Conclusion Complies to the enterprise standard

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