Entecavir
About Entecavir
Entecavir is an oral antiviral prescription medication used to treat chronic hepatitis B virus infection in adults and children. It works by lowering the amount of the virus in your body, which helps prevent the infection from causing severe damage to your liver. It is important to know that while this medication helps manage the virus, it is not a cure for hepatitis B.
For Entecavir to work effectively, you must take it consistently at the same time every day. Taking your dose on an empty stomach is highly important, meaning you should take it at least 2 hours after a meal and at least 2 hours before your next meal. Making healthy lifestyle choices, such as eating a balanced diet and avoiding alcohol, can also support your liver health while using this treatment.
While taking Entecavir, some people may experience mild side effects like headaches, fatigue, dizziness, or nausea. However, you must contact your doctor immediately if you experience signs of rare but serious conditions, such as lactic acid buildup in your blood or worsening liver symptoms. Your healthcare team is always your best resource if you notice any unusual physical changes.
Do not take this medicine if you are allergic to any of its ingredients. Before starting Entecavir, tell your doctor if you have kidney disease, as your dose may need to be adjusted. It is also vital to be tested for HIV before starting this medication; taking Entecavir if you have untreated HIV can make the HIV virus much harder to treat in the future.
Certain medications can interact with Entecavir, especially those that affect how your kidneys filter waste. Additionally, you should consult your doctor or pharmacist if you are pregnant, planning to become pregnant, breastfeeding, or if you are caring for an elderly patient, to ensure this medication is safe for your specific situation.
Uses of Entecavir
• Treatment of Chronic HBV Infection in Adults: Entecavir is indicated for adults with chronic HBV infection, including those with compensated liver disease (liver is damaged but still functions properly) and decompensated liver disease (liver is damaged and no longer functions properly).
• Treatment of Chronic HBV Infection in Children: Entecavir is also used to treat chronic HBV infection in children and adolescents aged 2 to under 18 years who have compensated liver disease.
Medicinal Benefits
Entecavir helps treat chronic hepatitis B infection by reducing the amount of virus in the body and protecting your liver from ongoing damage. Although it is not a cure for hepatitis B, it can help keep the infection under control, improve liver health, and lower the risk of serious liver-related complications.
Benefits may include:
- Helps reduce the amount of hepatitis B virus in the body.
- Supports healthy liver function by limiting ongoing liver damage.
- Reduces the risk of complications such as cirrhosis and liver failure.
- Helps lower the risk of disease progression associated with chronic hepatitis B.
- Provides effective long-term control of chronic hepatitis B infection when taken as prescribed.
Directions for Use
- Take Entecavir on an empty stomach. This means taking your dose at least 2 hours after eating a meal and at least 2 hours before your next meal.
- Swallow the tablet whole with a full glass of water. Do not crush, chew, or break the tablet.
- Take your dose at the same time every day to keep a steady level of the medicine in your body.
- Always follow your doctor's exact instructions regarding your treatment. Never stop taking this medicine without speaking to your doctor first, as stopping can cause your hepatitis infection to suddenly flare up and worsen.
Storage
Side Effects of Entecavir
Common Side Effects (Usually mild):
- Headache
- Feeling unusually tired or weak
- Dizziness
- Nausea or mild stomach upset
Serious Side Effects (Call a doctor right away):
- Signs of lactic acid buildup (lactic acidosis), such as unusual muscle pain, trouble breathing, cold or numb limbs, severe dizziness, or a fast or irregular heartbeat.
- Signs of worsening liver damage, including yellowing of your skin or eyes (jaundice), dark-colored urine, light-colored stools, severe stomach pain, or persistent nausea and vomiting.
- Signs of an allergic reaction, such as a skin rash, itching, hives, or swelling of the face, lips, tongue, or throat.
Medicines Containing this Salt
View AllDrug Warnings
- Never stop taking this medicine abruptly: Stopping your treatment suddenly can cause a severe, life-threatening flare-up of your hepatitis B infection.
- Get regular blood tests: You must visit your doctor for regular blood tests to check your liver function and monitor how well the medicine is working.
- Get tested for HIV: Ensure you are tested for HIV before starting Entecavir. If you have untreated HIV, taking this drug can cause the HIV virus to become resistant to standard HIV treatments.
- Watch your kidney health: Tell your doctor if you have kidney problems, as you may need a lower dose or a modified dosing schedule.
- Set a daily reminder: Because this medicine must be taken on an empty stomach, setting a daily phone alarm can help you maintain a safe, consistent routine.
Drug Interactions
Drug-Drug Interaction:
- Medicines That May Reduce Kidney Function (e.g., cyclosporine, tacrolimus, gentamicin, amikacin, vancomycin): Taking these medicines alongside Entecavir may slow the removal of Entecavir from the body and increase the risk of side effects.
Drug-Food Interaction:
- Food: Consuming food while taking Entecavir may reduce the amount of medicine absorbed, making it less effective. Take Entecavir on an empty stomach, at least 2 hours before or 2 hours after a meal.
Drug-Disease Interaction:
- Kidney Disease: Because this medicine is cleared by the kidneys, decreased kidney function can cause the drug to build up to unsafe levels in the blood. Your doctor may need to adjust your dose.
- HIV Infection: If you have undiagnosed or untreated HIV, taking Entecavir can lead to the HIV virus developing resistance to similar antiviral medications, making future HIV treatment much more difficult.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
consult your doctorThe interaction of alcohol with Entecavir is unknown. Please consult a doctor before consuming alcohol while using Entecavir.
Pregnancy
cautionEntecavir is a category C pregnancy drug and is given to pregnant women only if the doctor thinks the benefits outweigh the risks.
Breast Feeding
consult your doctorIt is unknown whether Entecavir is excreted in human milk. Therefore, please consult a doctor if you are breastfeeding.
Driving
cautionEntecavir may cause dizziness, drowsiness or tiredness in some people. Therefore, avoid driving or operating heavy machinery if you feel dizzy, drowsy or tired after taking Entecavir.
Liver
cautionTake Entecavir with caution, especially if you have a history of liver disease. The dose may be adjusted by your doctor as required. Please consult a doctor.
Kidney
cautionTake Entecavir with caution, especially if you have a history of kidney disease. The dose may be adjusted by your doctor as required. Please consult a doctor.
Children
cautionEntecavir is not recommended for children below 2 years or weighing less than 10 kg. However, in children above 2 years, Entecavir should be used with caution and doses prescribed by a doctor.
Habit Forming
Diet & Lifestyle Advise
- Avoid alcohol completely: Alcohol causes extra strain on your liver and can speed up liver damage, making it harder for your treatment to work safely.
- Eat a liver-friendly diet: Focus on whole foods, including fresh fruits, vegetables, lean proteins, and whole grains. Limit foods high in saturated fats, sugar, and processed ingredients.
- Stay hydrated: Drink plenty of water throughout the day to help your kidneys efficiently process and clear the medication from your body.
- Avoid self-medicating with supplements: Do not take any herbal remedies, vitamins, or liver detox supplements without asking your pharmacist or doctor first, as some can cause direct liver toxicity.
- Practice safe habits: Remember that hepatitis B can spread through contact with infected blood or bodily fluids. Avoid sharing personal items like razors or toothbrushes, and use barrier protection during sexual activity to protect others.
Special Advise
You are advised to take proper precautions if you are infected with the hepatitis B virus to prevent infection from spreading to others through sexual contact or body fluids.
Patients Concern
Disease/Condition Glossary
Hepatitis B: It is a severe liver infection caused by the hepatitis B virus (HBV). It is highly contagious (spreads from one person to another) and spreads through intimate contact with the infected person, direct contact with infected blood, being pricked with a contaminated needle, using a razor or any other personal items with leftovers of infected fluid or even transfer from mother to baby during birth. The virus can live for up to 7 days outside the body. Chronic hepatitis B develops slowly, and the symptoms may not be clear unless complications develop. The symptoms of hepatitis B may appear after 3 months of exposure to the virus and can last for 2 to 12 weeks. The complications of chronic hepatitis B include liver failure, liver cancer or liver cirrhosis (scarring). Hepatitis B can be prevented by getting vaccinated.
FAQs
Entecavir is used to treat chronic hepatitis B virus (HBV) infection.
Entecavir contains Entecavir, an antiviral drug that works by preventing viral DNA polymerase enzyme action in the liver cells, which is essential for the virus to multiply. Therefore, it prevents the virus from replicating and reduces the amount of hepatitis B virus in the body.
Yes, hepatitis B virus infection is highly contagious and spreads from one person to another. Therefore, it is recommended to avoid sharing personal items or needles containing an infected person's blood or body fluids.
Entecavir may cause lactic acidosis (excess of lactic acid in the blood), a rare but severe side effect, especially in women who are very obese. However, if you experience stomach pain, vomiting or nausea while taking Entecavir, please consult a doctor immediately.
You are not recommended to take Entecavir with celecoxib (painkiller), as it may increase the blood levels of Entecavir, leading to more adverse effects and may also affect kidney function. However, please consult your doctor before taking Entecavir with other medicines.
Entecavir does not cure hepatitis B virus infection. Entecavir reduces the amount of hepatitis B virus in the body and improves liver functioning by decreasing liver damage.
Entecavir is not recommended for hepatitis B patients with HIV infection unless they are taking medicines to treat HIV infection at the same time, as Entecavir may cause HIV infection to become resistant to certain HIV drugs and reduce their effectiveness. Therefore, it is advised to get tested for HIV infection before taking Entecavir.
You are not recommended to stop taking Entecavir without consulting your doctor, as it may worsen the infection or cause recurring symptoms. Therefore, take Entecavir for as long as your doctor has prescribed it. If you experience any difficulty while taking Entecavir, please consult your doctor.
Entecavir may cause side effects like dizziness, headache, nausea, vomiting, drowsiness, extreme tiredness, inability to sleep, diarrhoea, or indigestion. Most of these side effects do not require medical attention. However, if the side effects worsen, please consult your doctor.
Food significantly lowers the amount of medicine your body can absorb, making the treatment less effective. Taking it on an empty stomach ensures you receive the full therapeutic benefit. Talk to your doctor or pharmacist if you have trouble scheduling your doses.
Severe stomach pain, especially when accompanied by nausea, vomiting, or deep breathing, can be a sign of a serious condition called lactic acidosis or worsening liver issues. You should contact your doctor or seek emergency medical care immediately.
The safety of this medicine during pregnancy has not been fully established. If you are pregnant, planning to become pregnant, or breastfeeding, talk to your doctor to carefully weigh the risks and benefits for you and your baby.
No, taking this medicine does not prevent the spread of hepatitis B through sexual contact or blood exposure. You must continue to practice safe sex and avoid sharing personal items like needles or razors. Talk to your doctor about how to keep your loved ones safe.
Treatment for chronic hepatitis B is usually long-term and often lasts for several years or even indefinitely. Your doctor will monitor your blood tests regularly to determine how long you need to stay on the medication. Talk to your doctor if you have questions about the duration of your treatment.
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