ten-OF-oh-vir dye-soe-PROX-il FUE-ma-rate
Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with the use of nucleoside analogs. Severe acute exacerbations of hepatitis have been reported in HBV-infected patients who have discontinued anti-hepatitis B therapy, including tenofovir disoproxil fumarate. Upon therapy discontinuation, monitor hepatic function closely and resume anti-hepatitis B therapy if warranted .
Commonly used brand name(s):
In the U.S.
Available Dosage Forms:
Therapeutic Class: Antiretroviral Agent
Pharmacologic Class: Nucleotide Reverse Transcriptase Inhibitor
Tenofovir is used, in combination with other medicines, in the treatment of the infection caused by the human immunodeficiency virus (HIV). HIV is the virus that causes acquired immunodeficiency syndrome (AIDS).
Tenofovir will not cure or prevent HIV infection or AIDS; however, it may help keep HIV from reproducing which may slow down the destruction of the immune system. This may help delay the development of problems usually related to AIDS or HIV disease. Tenofovir will not keep you from spreading HIV to other people. People who receive tenofovir may continue to have other problems usually related to AIDS or HIV disease.
Tenofovir is also used to treat chronic (long-term) hepatitis B virus (HBV) infection.
tenofovir is available only with your doctor's prescription.
Once a medicine has been approved for marketing for a certain use, experience may show that it is also useful for other medical problems. Although this use is not included in product labeling, tenofovir is used in certain patients with the following medical condition:
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 tenofovir, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to tenofovir 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 tenofovir in the pediatric population. Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of tenofovir in the elderly. However, elderly patients are more likely to have age-related liver, kidney, or heart problems, which may require caution in patients receiving tenofovir.
|All Trimesters||B||Animal studies have revealed no evidence of harm to the fetus, however, there are no adequate studies in pregnant women OR animal studies have shown an adverse effect, but adequate studies in pregnant women have failed to demonstrate a risk to the fetus.|
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 tenofovir 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 tenofovir 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 tenofovir. Make sure you tell your doctor if you have any other medical problems, especially:
Take tenofovir 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 tenofovir without checking with your doctor first.
tenofovir may be taken with or without food.
tenofovir works best when there is a constant amount in the blood. To help keep the amount constant, do not miss any doses.
When your tenofovir supply runs low, get more from your pharmacy or from your doctor. The amount of virus in your blood may increase if the medicine is stopped, even for a short time. The virus may develop resistance to tenofovir and be harder to treat.
tenofovir comes with a patient information leaflet. Read and follow these instructions carefully. Read it again each time you refill your prescription in case there is new information. You should talk to your doctor if you have any questions.
The dose of tenofovir 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 tenofovir. 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 tenofovir, 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 your progress at regular visits. This will allow your doctor to see if the medicine is working properly. Blood tests may be needed to check for unwanted effects.
You should not use tenofovir if you are also taking adefovir (Hepsera®), Atripla™, or Truvada®. Tell your doctor right away if you are using any of these medicines. Do not start using tenofovir until your doctor tells you to.
Two rare but serious reactions to tenofovir are lactic acidosis (build-up of acid in the blood) and liver toxicity, including an enlarged liver. These are more common if you are female, very overweight (obese), or have been taking anti-HIV medicines for a long time. Call your doctor right away if you experience abdominal discomfort or cramping, nausea, vomiting, diarrhea, decreased appetite, discomfort, muscle cramping or pain, or unusual tiredness or weakness, trouble breathing, or if your skin or eyes have turned yellow.
tenofovir may also increase your risk of developing bone fractures. Ask your doctor about this if you have any concerns.
When you start taking HIV medicines, your immune system may get stronger. If you have infections that are hidden in your body, such as pneumonia or tuberculosis, you may notice new symptoms when your body tries to fight them. If this occurs, tell your doctor immediately.
tenofovir 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.
You should avoid breastfeeding if you have HIV or AIDS, because you may give the infection to your baby through your breast milk.
Tenofovir does not decrease the risk of transmitting the HIV infection to others through sexual contact or by contamination through blood. HIV may be spread to others through infected body fluids, including blood, vaginal fluid, or semen. If you are infected, it is best to avoid any sexual activity involving an exchange of body fluids with other people. If you do have sex, always wear (or have your partner wear) a condom (“rubber”). Only use condoms made of latex or polyurethane and use them every time you have contact with semen, vaginal secretions, or blood. Also, do not share needles with anyone or use dirty needles. If you have any questions about this, check with your doctor.
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:Rare
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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