tenofovir (Oral route)Pronunciation
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, including tenofovir disoproxil fumarate. Severe acute exacerbations of hepatitis have been reported in patients infected with hepatitis B virus (HBV) who have discontinued anti-hepatitis B therapy, including tenofovir disoproxil fumarate. Closely monitor hepatic function in these patients for several months following the discontinuation of emtricitabine and resume anti-HBV 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
Uses For tenofovir
Tenofovir is used in combination with other medicines for 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. It helps keep HIV from reproducing and appears to slow down the destruction of the immune system. This may help delay problems that are usually related to AIDS or HIV disease from occurring. Tenofovir will not keep you from spreading HIV to other people. People who receive tenofovir may continue to have some of the 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:
- Human immunodeficiency virus (HIV) infection in combination with hepatitis B virus (HBV) infection.
Before Using tenofovir
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 for the treatment of HIV infection in children younger than 2 years of age. Safety and efficacy have not been established.
Appropriate studies have not been performed on the relationship of age to the effects of tenofovir for the treatment of hepatitis B infection in children younger than 12 years of age and weighing less than 35 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 tenofovir in the elderly. However, elderly patients are more likely to have age-related kidney, liver, or heart problems, which may require caution and an adjustment in the dose for 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.
Interactions with Medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking tenofovir, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
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.
- Adefovir Dipivoxil
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.
Interactions with Food/Tobacco/Alcohol
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.
Other Medical Problems
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:
- Bone problems (eg, fractures), history of or
- Fanconi syndrome (type of kidney disease) or
- Kidney failure, acute or
- Liver disease (including hepatitis) or
- Osteomalacia (soft bones) or
- Osteoporosis (weak or brittle bones)—Use with caution. May make these conditions worse.
- Kidney disease, moderate to severe (requires dialysis)—Use with caution. The effects may be increased because of slower removal of the medicine from the body.
Proper Use of tenofovir
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.
tenofovir comes with a patient information leaflet. Read and follow the information carefully. Read it again each time you refill your prescription in case there is new information. Ask your doctor if you have any questions.
It is important to take tenofovir as part of a combination regimen. Take all of the medicines your doctor prescribed at the right time of day. This will make your medicines work better.
Keep taking tenofovir for the full time of treatment, even if you or your child begin to feel better. Do not stop taking it without checking first with your doctor. When your supply of the medicine is running low, contact your doctor or pharmacist ahead of time. Do not allow yourself to run out of the medicine.
You may take tenofovir with or without food.
For patients who cannot swallow the tablets, tell your doctor right away. Your doctor may want you to take the oral powder.
If you are using the oral powder:
- Measure the oral powder correctly using the dosing scoop that comes with the package. If you have any questions about this, ask your doctor or pharmacist.
- Mix the oral powder with 2 to 4 ounces of soft food (eg, applesauce, baby food, yogurt).
- After mixing, swallow it right away to avoid bitter taste.
- Do not mix the oral powder with any liquid.
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.
- For oral dosage forms (oral powder or tablets):
- For treatment of HIV infection:
- Adults and children 12 years of age and older weighing 35 kilograms (kg) or more—300 milligrams (mg) once a day.
- Children 2 to 11 years of age—Dose is based on body weight and must be determined by your doctor. The dose is usually 8 milligrams (mg) per kilogram (kg) of body weight per day. Your doctor may increase your dose as needed. However, the dose is usually not more than 300 mg per day.
- Children younger than 2 years of age—Use and dose must be determined by your doctor.
- For treatment of chronic hepatitis B infection:
- Adults and children 12 years of age and older weighing 35 kilograms (kg) or more—300 milligrams (mg) once a day.
- Children younger than 12 years of age and weighing less than 35 kg—Use and dose must be determined by your doctor.
- For treatment of HIV infection:
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.
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.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep the bottle tightly closed. Use the medicine dispensed only in its original container.
Precautions While Using tenofovir
It is very important that your doctor check the progress of you or your child at regular visits to make sure that tenofovir is working properly. Blood tests may be needed to check for unwanted effects.
Do not use tenofovir if you or your child are also taking adefovir, Atripla®, Complera®, Hepsera®, Stribild™, or Truvada®. Tell your doctor right away if you or your child 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 or your child have stomach discomfort or cramping, nausea, vomiting, or diarrhea, a decreased appetite, a general feeling of discomfort, muscle cramping or pain, unusual tiredness or weakness, trouble breathing, or yellow skin or eyes.
Do not change your dose or stop taking tenofovir, even for a short time, without talking to your doctor.
tenofovir may increase your risk of having broken bones (fractures). Ask your doctor about this if you or your child have any concerns.
When you or your child start taking HIV medicines, your immune system may get stronger. If you or your child have infections or disorders that are hidden in your body (eg, Graves' disease, Guillain-Barré syndrome, polymyositis, pneumonia, tuberculosis), you may notice new symptoms when your body tries to fight them. If this occurs, tell your doctor right away.
tenofovir may cause you to have excess body fat. Tell your doctor if you or your child 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.
Tenofovir does not decrease the risk of transmitting HIV infection to others through sexual contact or by contamination through blood. HIV may be acquired from or 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 re-use or share needles or equipment with anyone. If you have any questions about this, check with your doctor.
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 or vitamin supplements.
tenofovir Side Effects
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:Less common
- Chest pain
- fever or chills
- sore throat
- tightness in the chest
- troubled breathing
- Abdominal or stomach discomfort
- decreased appetite
- fast, shallow breathing
- general feeling of discomfort
- muscle pain or cramping
- unusual tiredness or weakness
- bloody or cloudy urine
- bone pain
- convulsions or seizures
- darkened urine
- decreased frequency or amount of urine
- difficult or painful urination
- fast heartbeat
- increased blood pressure
- increased thirst
- muscle twitching
- pains in the stomach, side, or abdomen, possibly radiating to the back
- swelling of the face, fingers, or lower legs
- weight gain
- yellow eyes or skin
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
- Back pain
- hives or welts
- itching skin
- lack or loss of strength
- redness of the skin
- skin rash
- Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
- heartburn or indigestion
- joint pain or swelling
- muscle pains or stiffness
- passing of gas
- redistribution or accumulation of body fat
- weight loss
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.
See also: tenofovir side effects (in more detail)
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