Efavirenz
About Efavirenz
Efavirenz is an oral prescription medicine used in combination with other antiretroviral drugs to treat Human Immunodeficiency Virus Type 1 (HIV-1). It belongs to a class of medicines known as non-nucleoside reverse transcriptase inhibitors (NNRTIs), which work by preventing the virus from multiplying in your body. Efavirenz should never be used alone because HIV can quickly become resistant to treatment. It is commonly prescribed as part of a three-drug antiretroviral therapy (ART) regimen, often together with medicines such as tenofovir and emtricitabine.
To get the best results, you must take Efavirenz consistently every single day exactly as prescribed by your doctor. It is highly recommended to take this medicine on an empty stomach, preferably at bedtime, to help reduce dizziness and sleep-related side effects. Along with taking your medication, maintaining a balanced diet, staying hydrated, and avoiding recreational drugs are important lifestyle steps to support your immune health.
Many people taking this medicine experience temporary side effects such as dizziness, vivid dreams, or difficulty sleeping, which usually improve after a few weeks. However, you must contact your doctor immediately if you develop severe mood changes, depression, thoughts of self-harm, or a severe skin rash. Seeking timely medical advice for these serious symptoms is crucial for your safety.
Talk to your doctor before starting Efavirenz if you have a history of liver disease, mental health disorders, or seizures. Do not take this if you have severe liver damage or are taking certain other medications that can cause life-threatening drug interactions. Before starting treatment, your healthcare provider may recommend baseline blood tests, including HIV genotypic resistance testing when appropriate, to help ensure Efavirenz is likely to be effective as part of your treatment regimen.
This medicine interacts with several other medications, alcohol, and herbal supplements like St. John's wort, which can reduce its effectiveness or increase side effects. If you are pregnant, planning to become pregnant, breastfeeding, or are an elderly individual, consult your doctor to discuss the risks and benefits of using this treatment. Your healthcare team can guide you on safe alternatives if needed.
Uses of Efavirenz
Medicinal Benefits
Efavirenz helps control HIV infection by lowering the amount of virus in the body and protecting the immune system.
Benefits may include:
- Helps lower the amount of HIV in the body.
- Supports a stronger immune system and overall health.
- Reduces the risk of HIV-related infections and complications.
- Promotes long-term management of HIV with consistent treatment.
- Helps reduce the risk of passing HIV to others when used as prescribed with combination therapy.
Directions for Use
- Swallow the tablet whole with a full glass of water. Do not crush, chew, or break the tablet.
- Take this medicine on an empty stomach, preferably at bedtime, as taking it with food (especially high-fat meals) can significantly increase the level of medicine in your body and make side effects like dizziness much worse.
- Always follow your doctor's exact instructions regarding how and when to take your medication. Do not skip doses or stop taking it without consulting your healthcare provider, even if you feel well.
Storage
Side Effects of Efavirenz
Common Side Effects (Usually mild):
- Dizziness or feeling lightheaded
- Vivid, unusual dreams or trouble sleeping
- Headache or feeling unusually tired
- Mild skin rash
Serious Side Effects (Call a doctor right away):
- Severe depression, extreme sadness, anxiety, or thoughts of self-harm
- Severe, widespread skin rash accompanied by peeling, blisters, or fever
- Signs of liver damage, such as yellowing of your eyes or skin, dark urine, or severe stomach pain
- Involuntary muscle movements, severe dizziness, or confusion
Medicines Containing this Salt
View AllDrug Warnings
- Take it at bedtime: Taking your dose right before you go to sleep can help you sleep through the peak side effects, like dizziness or lightheadedness.
- Monitor your skin closely: Watch for any signs of a skin rash during the first few weeks of starting treatment, and report any redness, peeling, or blistering to your doctor immediately.
- Track your mood: Keep a close eye on your mental health and ask a trusted family member or friend to watch for changes in your mood, severe sadness, or unusual behaviour.
- Do not skip doses: Skipping doses can allow the virus to become resistant to the medication, making it much harder to treat your infection in the future.
- Check for interactions before starting new pills: Always consult your pharmacist or doctor before taking any new prescription drugs, over-the-counter medicines, or herbal supplements.
- Seek immediate medical help: Contact your doctor or seek emergency care if you experience severe depression, anxiety, worsening seizures, or signs of liver problems (such as yellowing of your skin and dark urine).
- Tell your doctor if HIV symptoms worsen: Contact your doctor if your HIV symptoms get worse despite taking your medicine regularly, or if you frequently miss your doses.
- Inform your doctor about pregnancy: Tell your doctor immediately if you become pregnant, plan to become pregnant, or think you may be pregnant while taking this medicine.
Drug Interactions
- Certain cholesterol medicines (e.g., simvastatin, atorvastatin): Efavirenz may lower the levels of these drugs in your body, making them less effective.
- Sedatives or sleep medicines (e.g., midazolam, triazolam): Combining these can lead to extreme sleepiness or serious breathing difficulties.
- Antifungal medicines (e.g., voriconazole): Taking these together can alter the levels of both medications in your bloodstream, increasing side effects or reducing effectiveness.
- Hormonal contraceptives (birth control pills, patches, or implants): Efavirenz can make hormonal birth control less effective, so you should use a reliable barrier method (like condoms) while on this medication.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
cautionIt is advised to avoid consuming alcohol as it may worsen the condition.
Pregnancy
cautionEfavirenz is a category B medicine. It should be used with caution in pregnant women as Efavirenz may pass into breastmilk, which can transmit HIV to baby, so do not breastfeed your child.
Breast Feeding
cautionEfavirenz should only be used in breastfeeding females if prescribed by the doctor.
Driving
cautionEfavirenz may cause dizziness. So, avoid driving or refrain from any activities that require you to alert mentally.
Liver
cautionDose adjustment may be needed in patients with liver impairment. Please consult your doctor if you have a liver impairment or any concerns regarding this.
Kidney
unsafeEfavirenz should not be used in adolescents with kidney failure. In other people with severe kidney diseases, Efavirenz is given only if clinically needed and suggested by the doctor.
Children
safe if prescribedEfavirenz is safe to be used in children only if suggested by the doctor depending upon the age and weight of the child.
Habit Forming
Diet & Lifestyle Advise
- Avoid high-fat meals close to your dose: Do not eat high-fat foods within a few hours of taking Efavirenz, as this can cause your body to absorb too much of the medicine rapidly, worsening dizziness and sleep problems.
- Limit or avoid alcohol: Alcohol can significantly worsen the dizziness, drowsiness, and concentration problems caused by this medicine, and it also increases the strain on your liver.
- Eat a balanced diet: Focus on immune-supporting foods like lean proteins, whole grains, fruits, and vegetables to help your body fight off infections.
- Prioritise sleep hygiene: Since this medicine can cause vivid dreams or insomnia, establish a relaxing bedtime routine and keep your bedroom dark and quiet to improve sleep quality.
Special Advise
- Your doctor may regularly monitor liver function, kidney function and bone density if you take Efavirenz.
- Reliable method of contraceptives should be used to prevent pregnancy while using Efavirenz.
Patients Concern
Disease/Condition Glossary
Human immunodeficiency syndrome (HIV): It is a virus that suppresses the immune system and causes acquired immunodeficiency syndrome (AIDS) over time. The suppression of immunity leads to the development of opportunistic infections. It is a life-long condition and there is no permanent cure. The treatment (antiretroviral therapy) is given to suppress the infection. If the right treatment is not provided, then it may affect and kill immune cells which can put the body at high risk of getting serious infections. HIV can transfer from one person to another by blood, vaginal and rectal fluids, breast milk and semen.
FAQs
Efavirenz is used to treat HIV infection.
Efavirenz is not a complete treatment of HIV infection however this medicine helps to reduce the HIV in the body so that the immune system of the body can protect the body from other infections associated with a weak immune system.
To reduce the chance of spreading HIV to others it is suggested to keep taking all the HIV medicines suggested by your doctor. Use an effective contraceptive method during sexual activity and never share your personal items like needles, syringes, toothbrushes with anyone as these products may have liquid with HIV.
Efavirenz contains Efavirenz, which is a nucleotide reverse transcriptase inhibitor and works by interfering with the normal working of enzymes (reverse transcriptase in HIV) that are essential for the production of viruses. It can effectively reduce the symptoms associated with HIV.
Efavirenz does not affect fertility. However, if you develop any side-effects while using Efavirenz, consult your doctor immediately.
Efavirenz should be taken as prescribed by your doctor. Abrupt stopping of this medicine may lead to resistance to other medications making the infection difficult to treat.
Efavirenz may cause dizziness. So, it would be best if you refrained from driving or operating heavy machinery that requires you to stay alert.
Efavirenz may alter kidney function. So, it is used with caution in patients with kidney failure, especially adolescents.
Efavirenz belongs to a group of medications known as 'antiretroviral drugs'. It is used to treat HIV infection in adults and children aged at least 3 months and weighing 3.5 kg or more. It contains 'Efavirenz,' a nucleotide reverse transcriptase inhibitor, which works by blocking the activity of the reverse transcriptase enzyme essential for HIV replication. This helps to reduce the symptoms associated with HIV and slows the progression of the infection.
Yes, Efavirenz is safe if taken in the dose and duration exactly as prescribed by the doctor.
Yes, Efavirenz is effective in managing HIV infection when used as part of a combination antiretroviral therapy (ART). It helps reduce the viral load in the body, increases the count of CD4 cells (a type of white blood cell that fights infections), and slows the progression of the disease. However, its effectiveness depends on following the prescribed treatment plan and regular follow-ups with the doctor.
If you forget to take a dose of Efavirenz, take it as soon as you remember. However, if it’s almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not double the dose.
Efavirenz is generally not recommended during pregnancy, especially in the first trimester, as it may cause harm to the developing baby. Consult the doctor before taking Efavirenz, If you are pregnant, planning to become pregnant or think you might be pregnant. The doctor will evaluate the risks and benefits and may suggest alternative medications if necessary.
The side effects of Efavirenz include trouble sleeping, dizziness, drowsiness, unusual dreams and difficulty concentrating. Consult the doctor if any of these side effects persist or worsen.
No, you should take Efavirenz on an empty stomach, preferably at bedtime. Taking it with food, especially high-fat meals, can cause your body to absorb too much of the medicine, which increases the intensity of side effects like dizziness and confusion. Talk to your doctor or pharmacist if you have trouble scheduling your doses.
Taking this medicine at bedtime helps minimise the impact of common nervous system side effects, such as dizziness, drowsiness, and trouble concentrating, by allowing you to sleep through them. These symptoms are usually most noticeable in the first few weeks of treatment. Talk to your doctor if these symptoms persist or bother you.
Mild rashes are common when starting this medicine and often go away on their own. However, because a rash can sometimes be a sign of a severe, life-threatening skin reaction, you must report any new rash to your healthcare provider immediately. Talk to your doctor right away if the rash is accompanied by a fever, peeling skin, or mouth sores.
HIV treatment is lifelong, and Efavirenz should be taken every day as part of your complete antiretroviral therapy unless your doctor changes your treatment plan. During treatment, your healthcare provider will regularly monitor your viral load to ensure the medicine is controlling HIV, CD4 cell counts to assess your immune system, and may also perform liver function tests and other blood tests to check for side effects and confirm your treatment remains effective. Keep all scheduled medical appointments and laboratory tests.
No. Efavirenz is always used in combination with other antiretroviral medicines because using it alone can allow HIV to become resistant. It is commonly prescribed with medicines such as tenofovir and emtricitabine, and many people receive all three medicines together as a single fixed-dose combination tablet, making treatment simpler and helping improve adherence.
It is highly recommended to avoid alcohol while taking this medicine. Alcohol can worsen the dizziness, sleepiness, and concentration difficulties caused by the medication, and both substances are processed by your liver, which can increase the risk of liver damage. Talk to your doctor if you have questions about alcohol use.
Yes, this medication can reduce the effectiveness of hormonal birth control methods, such as pills, patches, implants, or vaginal rings. To prevent unplanned pregnancy, you should use a reliable barrier method of contraception, such as condoms, in addition to or instead of your hormonal birth control. Talk to your doctor to find the best contraceptive option for you.
Yes, this medicine is known to cause psychiatric side effects in some patients, including severe depression, anxiety, mood swings, or thoughts of self-harm. If you notice any changes in your mental health, or if your friends or family notice unusual changes in your behaviour, contact your healthcare provider immediately. Talk to your doctor if you have a history of depression or mental illness before starting treatment.
If you miss a dose, take it as soon as you remember, unless your next scheduled dose is due soon. Do not take two doses at the same time to make up for a missed one, as this can increase your risk of severe side effects. Skipping doses regularly can make the virus resistant to treatment. Talk to your doctor or pharmacist if you frequently forget to take your medication.
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