Commonly used brand name(s):
In the U.S.
Available Dosage Forms:
Therapeutic Class: Antiretroviral Agent
Pharmacologic Class: Non-Nucleoside Reverse Transcriptase Inhibitor
Efavirenz is used with other medicines in the treatment of the infection caused by the human immunodeficiency virus (HIV). HIV is the virus that causes acquired immune deficiency syndrome (AIDS).
Efavirenz will not cure or prevent HIV infection or AIDS; however, it helps keep HIV from reproducing and appears to slow down the destruction of the immune system. This may help delay the development of problems that usually result from AIDS or HIV disease. Efavirenz will not keep you from spreading HIV to other people. People who receive efavirenz may continue to have some of the problems usually related to AIDS or HIV disease.
efavirenz is available only with your doctor's prescription.
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For efavirenz, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to efavirenz or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies have not been performed on the relationship of age to the effects of efavirenz in children below 3 years of age or those who weigh less than 13 kilograms (kg). Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of efavirenz in the elderly. However, elderly patients are more likely to have age-related kidney, liver, or heart problems, which may require an adjustment in the dose for patients receiving efavirenz.
|All Trimesters||D||Studies in pregnant women have demonstrated a risk to the fetus. However, the benefits of therapy in a life threatening situation or a serious disease, may outweigh the potential risk.|
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Using efavirenz with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.
Using efavirenz with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Using efavirenz with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
The presence of other medical problems may affect the use of efavirenz. Make sure you tell your doctor if you have any other medical problems, especially:
Take efavirenz exactly as directed by your doctor. Do not take it more often, and do not take it for a longer time than your doctor ordered. Also, do not stop taking efavirenz without checking with your doctor first. When your supply of efavirenz is running low, contact your doctor or pharmacist ahead of time. Do not allow yourself to run out of efavirenz.
efavirenz comes with a patient information insert. Read and follow the instructions in the insert carefully. Ask your doctor if you have any questions.
Keep taking efavirenz for the full time of treatment even if you begin to feel better. It is also important that you continue taking all other medicines for HIV infection your doctor has instructed you to take. Efavirenz will not work if it is taken alone. It must be taken with other HIV medication.
Efavirenz should be taken on an empty stomach because the amount of efavirenz absorbed into the body may be increased when taken with food, which might increase the chance of side effects.
Take efavirenz at bedtime, especially during the first 2 to 4 weeks, to lessen central nervous system (CNS) side effects that may occur with efavirenz. These effects usually lessen after you have been taking efavirenz for awhile.
The dose of efavirenz will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of efavirenz. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
If you miss a dose of efavirenz, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Ask your healthcare professional how you should dispose of any medicine you do not use.
It is very important that your doctor check the progress of you or your child at regular visits, to make sure efavirenz is working properly. Blood tests may be needed to check for unwanted effects.
Using efavirenz while you are pregnant can harm your unborn baby. Use an effective form of birth control to keep from getting pregnant. You should not become pregnant while you are taking efavirenz and for 12 weeks after stopping it. If you think you have become pregnant while using the medicine, tell your doctor right away. Your doctor may want you to join a pregnancy registry for patients taking an anti-HIV medicine.
You should not breastfeed if you have HIV or AIDS, because you may give the infection to your baby through your breast milk.
Do not use efavirenz if you are also using Atripla®, astemizole (Hismanal®), bepridil (Vascor®), cisapride (Propulsid®), ergot medicines (e.g., dihydroergotamine, ergonovine, ergotamine, methylergonovine, Cafergot®, or Wigraine®), midazolam (Versed®), pimozide (Orap®), triazolam (Halcion®), or voriconazole (Vfend®).
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal (e.g., St. John's wort) or vitamin supplements.
efavirenz may cause some people to become dizzy, lightheaded, drowsy, or less alert than they are normally. Even if taken at bedtime, it may cause some people to feel drowsy or less alert on arising. Make sure you know how you react to efavirenz before you drive, use machines, or do anything else that could be dangerous if you are not alert.
Check with your doctor before taking efavirenz with alcohol or other medicines that affect the central nervous system (CNS). The use of alcohol or other medicines that affect the CNS with efavirenz may worsen the side effects of efavirenz, such as dizziness, poor concentration, drowsiness, unusual dreams, and trouble with sleeping. Some examples of medicines that affect the CNS are antihistamines or medicine for allergies or colds; sedatives, tranquilizers, or sleeping medicine; medicine for depression; medicine for anxiety; prescription pain medicine or narcotics; medicine for attention deficit and hyperactivity disorder; medicine for seizures or barbiturates; muscle relaxants; or anesthetics, including some dental anesthetics.
efavirenz may increase your risk of having serious mental or behavioral problems. Tell your doctor if you develop any mood changes, strange thoughts, or any unusual behavior while you are using efavirenz.
When you start taking HIV medicines, your immune system may get stronger. If you have certain infections, such as pneumonia or tuberculosis, you may notice new symptoms when your body tries to fight them. If this occurs, be sure to tell your doctor.
Efavirenz may cause you to have excess body fat. Tell your doctor if you notice changes in your body shape, such as an increased amount of fat in the upper back and neck, or around the chest and stomach area. You might also lose fat from the legs, arms, and face.
efavirenz will not keep you from giving HIV to your partner during sex. Make sure you understand this and practice safe sex, even if your partner also has HIV, by using a latex condom or other barrier method. efavirenz will also not keep you from giving HIV to other people if they are exposed to your blood. Do not re-use or share needles with anyone.
Birth control pills may not work as well while you are using efavirenz. Use another form of birth control while you are taking efavirenz and for 12 weeks after stopping it to keep from getting pregnant. Other forms include condoms, a diaphragm, or a contraceptive foam or jelly.
Check with your doctor right away if you develop a skin rash; blistering, peeling, or loosening of the skin; red skin lesions; sores or ulcers on the skin; or fever or chills while you are using efavirenz.
Tell the doctor in charge that you are taking efavirenz before you have any medical tests. The results of some tests may be affected by efavirenz.
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:More common
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:More common
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
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