It is very important that your doctor check the progress of you or your child at regular visits to make sure that this medicine is working properly. Blood tests may be needed to check for unwanted effects.
You should not use this medicine if you or your child are also taking adefovir (Hepsera®), Atripla®, Complera®, 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 this medicine 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 with breathing; or yellow skin or eyes.
Do not change your dose or stop taking this medicine, even for a short time, without talking to your doctor.
This medicine may increase your risk of having bone 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 (e.g., Graves' disease, Guillain-Barre syndrome, polymyositis, pneumonia, or tuberculosis), you may notice new symptoms when your body tries to fight them. If this occurs, tell your doctor right away.
This medicine 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 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 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.