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Pharmacology of Cronivir 0.5mg

Cronivir containing Entecavir exhibits its anti-viral activity by prohibiting three steps in viral production; Cronivir is an anti-viral medicine, which is guanosine nucleoside analogue effective against HBV infection. Cronivir is encounters with natural substrate deoxyguanosine triphosphate. Cronivir interferes with three activities of HBV polymerase; Base priming from pregenomic messenger RNA, Reverse transcription of negative strand occurs Integration of positive strand of HBV DNA. A Cronivir tablet has Entecavir, which is inserting into viral DNA has extreme effect of prohibiting the HBV polymerase activity.

How the body working for Cronivir tablets

Cronivir tablet, after an oral administration it may undergo ADME properties. The peak plasma concentration time of Cronivir is occurs within 0.5 & 1.5 hours. The steady state of Cronivir is reaches after 6 to 10 days of single dose administration. Cronivir 0.5mg Cmax value is 4.2ng/ml and trough plasma concentration is 0.3ng/ml

Effect of food

Oral administration of Cronivir 0.5mg with high fat meal causes decreasing the absorption, depletes Cmax of 44 to 46%, decreases AUC of 18 to 20%.


The volume of distribution is exuberance of total body water; Entecavir is largely distributed into tissues. The binding of Entecavir with serum proteins occurs relatively 13%.


Entecavir should not be considering as cytochrome P450 enzymes substrate, inhibitor or inducers, which is adequately phosphorylated into an active triphosphate form.


Cronivir tablets after metabolism get eliminated via kidneys, in an unchanged form with the range 62% to 73%. The plasma concentration of Cronivir depletes in bi-exponential manner with the mean terminal half life period of relatively 128 to 148 hours and the phosphorylated metabolite half life is 15 hours.


Cronivir prophylactic use

The critical points take into consideration, while starting the therapy with Cronivir tablets; Indication of Cronivir is established by clinical trial data in nucleoside inhibitor-therapy naïve and lamivudine resistant patients with HBeAg positive and HBeAg negative HBV infection and compensated liver cirrhosis & decompensated cirrhosis. Cronivir is used in pediatric patients with 2 years of age or older, with treatment naïve, lamivudine resistant with HBeAg positive HBV infection & compensated liver cirrhosis. Main indication: Cronivir tablets are used to treat chronic hepatitis B viral infection commonly in adolescent patients with the sign of viral multiplication and other information of lasting elevation of serum aminotransferase or active disease.

Brand : Cronivir
Ingredients : Entecavir
Strength : 0.5mg
Manufactured : Hetero
Package : 30 tablets

Cronivir 0.5mg dosing consideration and its usage

Cronivir tablets should be taken on an empty stomach (partially 2 hours after a meal or two hours earlier to the next meal). The usual prescribed dosage of Cronivir tablets;

In compensated cirrhosis

In adults In this condition, the prescribed dosage of Cronivir is 0.5mg should be administered orally as a single dose for the chronic hepatitis B viral infected patients who have newly started with Cronivir. In past hepatitis B viremia, since taking lamivudine therapy or known lamivudine or telbivudine resistant alteration; the advised dosage of Cronivir tablets is 1mg should be administered orally as a single dose.

In pediatric

The safety and efficacy of Cronivir in children with the age of <2 years has not been established. In nucleoside naïve patients: 2 years or older with >30kg: 0.5mg of Cronivir should be recommended as single dose. In lamivudine resistant patients: 2 years and older with >30kg: 1mg (2 tablet of 0.5mg Cronivir) of Cronivir should be recommended as a single dose.

In decompensated liver cirrhosis

In decompensated condition, the suggested dosage is 1mg of Cronivir should be taken as once a day.

In renal damaged patients

If creatinine clearance decreased, then the apparent oral clearance of Cronivir is also decreased. The dosage recommendation for the patients; With creatinine clearance of less than 50ml/min, Hemodialysis patients and For Continuous ambulatory peritoneal dialysis patients (CAPD) CrCl ≥50ml/min: 0.5mg of Cronivir should be recommended; in lamivudine resistant or decompensated condition 1mg of Cronivir is recommend. In 30 to <50ml/min: 0.5mg of Cronivir is taken for every 48 hours; in lamivudine resistant or decompensated condition 0.5mg of Cronivir as single dose or 1mg of Cronivir taken for every 48 hours. In 10 to <30ml/min: 0.5mg of Cronivir should be given for every 72 hours; in lamivudine resistant or decompensated condition 1mg of Cronivir is recommended for every 72 hours. <10ml/min: & hemodialysis or CAPD: 0.5mg of Cronivir is recommended for every 7 days; in lamivudine resistant or decompensated condition 1mg of Cronivir should be given for every 7 days. In hepatic impairment patients, dosage adjustment of Cronivir should not be recommended.

Cronivir produces some undesirable effects

The most common adverse reaction occurs during or after the treatment; Severe aggravation of hepatitis B infection Lactic acidosis Hepatomegaly with steatosis The common side effects like Dyspepsia Alopecia Rash Elevation of transaminase Headache Fatigue Anaphylactic reactions Dizziness Diarrhea Nausea Vomiting Somnolence Insomnia Hepatic failure Gastrointestinal hemorrhage Hepatocellular carcinoma

Cronivir precautions

Some precautions should be taken while starting therapy with Cronivir

In severe acute aggravation of hepatitis B:

This adverse may occur after discontinuation of anti-hepatitis B therapy. In this condition patient should be monitored frequently with liver functions and other laboratory follow ups. Continue the anti-hepatitis B therapy, if required.

In HBV/HIV-1 co infected patients

Entecavir has not assessed in HIV/HBV co infected patients who are not concurrently taking effective anti-retroviral therapy. Cronivir tablet used for HBV infection in patients who are infected with HIV, produce resistant to HIV nucleoside reverse transcriptase inhibitors, not exist to treat. Cronivir should not be suggested to HBV/HIV co infected patients, also not receiving HAART. To overcome this type of condition, patient should be examine with HIV antibody testing before the therapy.

In lactic acidosis & hepatomegaly with steatosis

This condition may occur due to the combination of nucleoside analog with anti-retroviral agents, this may happen mostly in women. The major fatal cases of this condition is obesity and extended nucleoside exposure. Lactic acidosis frequently occurs in decompensated liver cirrhosis patients, the only way to reduce this adverse is discontinuing the treatment with Cronivir .

Cronivir interacts with some drugs like

Cronivir is not a CYP 450 enzyme substrate, inhibitor or inducers. Since Cronivir is majorly eliminated through kidneys, co administration of Cronivir tablets with drugs which reduce the renal functions causes increasing the serum concentration of Entecavir and other combined drugs leads to adverse effects of Cronivir. Drug interaction may occur during combination of Cronivir with the drugs which metabolized, inhibit or induce by CYP450 enzyme may have chance to alter pharmacokinetic properties of Entecavir. Co administration of Cronivir with lamivudine, Adefovir or tenofovir disoproxil fumarate not expels any drug interaction.


Renal and Hepatic impairment

Depending upon creatinine clearance, the dosage of Entecavir is suggested for patients who are having renal damage. They may follow the dosage adjustments. The safety and effectiveness of Entecavir in hepatic impaired patients has not been evaluated. If Cronivir is necessary to take in hepatic impairment patients, who are already receiving Immuno suppressant like cyclosporine, Tacrolimus or sirolimus causes affecting the renal function. Patient must examine periodically before or after the therapy using with Cronivir

Cronivir over dosage

If over dosage of Entecavir occurs, confirmation of toxicity should be taken and provide supportive measures. Following 1mg of Entecavir, nearly 13% of Entecavir dose should be eliminated by hemodialysis method.

Cronivir missed dose

Cronivir is used in chronic hepatitis B infection, if dose of Entecavir is fail to take by the patients, must consult with medical practitioner and take the dose within a time. On the other hand the missed dose is avoided and follows the regular schedule.

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