Entecavir Tablet: Uses, Dosage & Side Effects in Pakistan

Entecavir Tablet Uses, Dosage, Side Effects & Price in Pakistan

1. Quick Info (Mukhtasir Maloomat)

2. What is Entecavir? (Entecavir kya hai)

Entecavir is an antiviral medicine that treats chronic Hepatitis B (HBV). In Pakistan, it is available under the brand names Ecavir (local generic) and Baraclude (Bristol-Myers Squibb).

Entecavir inhibits HBV DNA polymerase — stopping virus replication. It does not completely eliminate the virus from the liver, which is why most patients require long-term or lifelong treatment.

Critical: Never discontinue treatment without specialist guidance — stopping entecavir can cause severe Hepatitis B flare which can lead to liver failure and death.

3. Uses (Fayde / Kis kaam aata hai)

• Chronic Hepatitis B (HBV) — suppressing virus replication in the liver, preventing liver damage
• HIV/HBV co-infection — specialist management is required
• Decompensated hepatic disease with active HBV — specialist only (1mg dose)

4. How It Works (Kaam kaise karta hai)

Entecavir is a guanosine analogue. In the body, it is phosphorylated to entecavir triphosphate → HBV DNA polymerase (reverse transcriptase function) is inhibited → HBV replication is stopped. It is more potent than lamivudine and adefovir. Resistance in first-line use is rare (high barrier to resistance). Functional cure (HBsAg clearance) ~1–3% per year — rare but the goal.

5. Who Should Take (Kin logon ke liye)

• Confirmed chronic Hepatitis B wale patients (HBV DNA positive, elevated ALT, liver biopsy findings)
• HIV/HBV co-infected patients (specialist management)
• Patients with decompensated liver disease and active HBV

6. When NOT to Take (Kab nahi lena chahiye)

• Known allergy to entecavir or any ingredient
• HIV/HBV co-infection without a fully suppressive HIV regimen (resistance risk)
• Severe renal impairment without dose adjustment

7. Dosage (Kitna lena hai)

Adult Dose

• Previously untreated patients: 0.5mg once daily — on EMPTY STOMACH
• Lamivudine-experienced or decompensated liver disease: 1mg once daily — empty stomach

Child Dose

• Weight-based dose — paediatric specialist guidance is required

Renal Impairment

• Dose reduction required — confirm with your doctor (based on creatinine clearance)

Missed Dose

• Take as soon as you remember, but if the next dose time is near, skip the missed dose. Never take a double dose.

8. How to Take (Kaise lena hai)

• EMPTY STOMACH — take 2 hours before or after food
• Once daily — same time every day
• Swallow tablets whole

9. Important Monitoring (Zaruri Tests)

Regular monitoring is required:

• HBV DNA — check viral suppression
• HBeAg / anti-HBe — monitor seroconversion
• Liver function tests (LFTs) — ALT/AST
• Creatinine / eGFR — renal function
• HBsAg — functional cure assessment

10. HIV/HBV Co-infection — Critical Warning

Entecavir used alone in HIV patients can select the M184V HIV resistance mutation. Therefore:

• In HIV/HBV co-infection, use only under supervision of an HIV specialist
• Fully suppressive antiretroviral therapy (ART) should be started before or alongside entecavir
• Tenofovir (TDF/TAF) — preferred option in HIV/HBV co-infection

11. Warnings (Ihtiyat)

• DO NOT STOP without a specialist — HBV flare on stopping is potentially fatal
• Take on empty stomach — food reduces absorption
• Lactic acidosis risk: IMMEDIATELY stop and seek emergency care for unexplained metabolic acidosis, severe abdominal pain, or rapid liver deterioration
• Monitor renal function

12. Side Effects (Nuksanat)

Common (generally mild)

• Headache
• Fatigue
• Dizziness
• Nausea
• Transient elevation of LFTs
• Upper respiratory infection symptoms

Serious (see a doctor immediately)

• Lactic acidosis — severe abdominal pain, persistent vomiting, muscle weakness, breathlessness
• HBV flare on stopping — jaundice, dark urine, severe fatigue (EMERGENCY — liver failure)
• Severe jaundice or abdominal pain (hepatotoxicity)

13. Drug Interactions

Entecavir is not metabolized by CYP enzymes — drug interactions are relatively few:

• NSAIDs, aminoglycosides — reduce renal clearance
• Cyclosporin / tacrolimus — nephrotoxic combination (transplant settings)
• Tenofovir — no significant interaction (often used together in HIV/HBV)

14. When to See Doctor (Kab doctor ke paas jayein)

• Severe abdominal pain + persistent vomiting (lactic acidosis — STOP, EMERGENCY)
• Jaundice / dark urine (hepatitis flare — liver damage)
• Muscle weakness / breathlessness (lactic acidosis)
• Any new symptom after stopping treatment (HBV rebound — EMERGENCY)
• HIV diagnosis if currently on entecavir alone

15. Alternatives (Dusri Dawaein)

16. Price in Pakistan (Price kitni hai)

17. FAQs

Q: What is Entecavir used for?

A: Suppresses chronic Hepatitis B — prevents liver damage. Long-term treatment usually required.

Q: Does Entecavir permanently cure Hepatitis B?

A: No — it suppresses the virus but does not completely eliminate it. Functional cure is rare. Continue treatment under specialist guidance.

Q: What are the side effects of Entecavir?

A: Generally well tolerated. Common: headache, fatigue, nausea. Serious: lactic acidosis (rare), HBV flare after stopping treatment (dangerous).

Q: What is the price of Entecavir in Pakistan?

A: Ecavir (local generic) and Baraclude are available. For exact price, check your pharmacy or dawaai.pk.

Q: Is it safe to stop Entecavir?

A: Never stop without a specialist. Stopping can trigger severe HBV flare — risk of liver failure and death.

18. Medical Review

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-06-17

19. Disclaimer (Zaroori tanbeeh)

The information on this page is for awareness only. It is not medical advice. Always consult your doctor or pharmacist before taking any medicine. PakVita is not responsible for any harm.