Emtricitabine is an antiviral medicine that prevents human immunodeficiency virus (HIV) from multiplying in your body.

Emtricitabine is used to treat HIV, the virus that can cause acquired immunodeficiency syndrome (AIDS). Emtricitabine is not a cure for HIV or AIDS.

Emtricitabine may also be used for purposes not listed in this medication guide.

Do not take Emtriva if you also take other medicines that contain emtricitabine or lamivudine.

Emtricitabine may cause a serious condition called lactic acidosis. Get emergency medical help if you have even mild symptoms such as: muscle pain or weakness, numb or cold feeling in your arms and legs, trouble breathing, stomach pain, nausea with vomiting, fast or uneven heart rate, dizziness, or feeling very weak or tired.

If you have hepatitis B you may develop liver symptoms after you stop taking emtricitabine, even months after stopping.

Emtricitabine comes as a capsule and an oral solution (liquid) to take by mouth. It is usually taken once a day with or without food. Take emtricitabine at around the same time every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take emtricitabine exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Emtricitabine controls HIV infection but does not cure it. Continue to take emtricitabine even if you feel well. Do not stop taking emtricitabine without talking to your doctor. When your supply of emtricitabine starts to run low, get more from your doctor or pharmacist. If you miss doses or stop taking emtricitabine, your condition may become more difficult to treat.

Ask your doctor or pharmacist for a copy of the manufacturer's information for the patient.

Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.

Emtricitabine can be taken with or without food.

Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.

If a child is using this medicine, tell your doctor if the child has any changes in weight. Emtricitabine doses are based on weight in children, and any changes may affect your child's dose.

Do not take emtricitabine as your only HIV medication. HIV/AIDS is usually treated with a combination of drugs. Use all medications as directed by your doctor. Read the medication guide or patient instructions provided with each medication. Do not change your doses or medication schedule without your doctor's advice. Every person with HIV or AIDS should remain under the care of a doctor.

While using emtricitabine, you may need frequent blood tests. Your kidney and liver function may also need to be checked.

Get your prescription refilled before you run out of medicine completely. Your disease may become resistant to emtricitabine if you stop taking the medication even for a short time.

Store capsules at room temperature away from moisture, heat, and direct light.

Store liquid in the refrigerator. Do not freeze.

Emtricitabine liquid kept at room temperature must be used within 3 months.

If you have hepatitis B you may develop liver symptoms after you stop taking this medication, even months after stopping. Your doctor may want to check your liver function for several months after you stop using emtricitabine.

You should not take emtricitabine if you are allergic to emtricitabine.

Do not take Emtriva if you also use other medicines that contain emtricitabine or lamivudine (such as Atripla, Combivir, Complera, Descovy, Dutrebis, Epivir, Epzicom, Genvoya, Odefsey, Stribild, Triumeq, or Trizivir).

To make sure emtricitabine is safe for you, tell your doctor if you have ever had:

• liver disease (especially hepatitis B); or

• kidney disease.

Some people taking this medicine develop a serious condition called lactic acidosis. This may be more likely in women, in people who are overweight or have liver disease, and in people who have taken HIV/AIDS medication for a long time. Talk with your doctor about your risk.

HIV can be passed to your baby if you are not properly treated during pregnancy. Take all of your HIV medicines as directed to control your infection.

If you are pregnant, your name may be listed on a pregnancy registry. This is to track the outcome of the pregnancy and to evaluate any effects of emtricitabine on the baby.

Women with HIV or AIDS should not breast-feed a baby. Even if your baby is born without HIV, the virus may be passed to the baby in your breast milk.

Emtricitabine is not approved for use by anyone younger than 3 months old.

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store the capsules at room temperature and away from excess heat and moisture (not in the bathroom). Store the oral solution in the refrigerator, but do not freeze it. If you prefer not to refrigerate the oral solution, you may store it at room temperature for up to 3 months. Discard any unused oral solution that has not been refrigerated after 3 months.

It is important to keep all medication out of sight and reach of children as many containers (such as weekly pill minders and those for eye drops, creams, patches, and inhalers) are not child-resistant and young children can open them easily. To protect young children from poisoning, always lock safety caps and immediately place the medication in a safe location – one that is up and away and out of their sight and reach. http://www.upandaway.org

Unneeded medications should be disposed of in special ways to ensure that pets, children, and other people cannot consume them. However, you should not flush this medication down the toilet. Instead, the best way to dispose of your medication is through a medicine take-back program. Talk to your pharmacist or contact your local garbage/recycling department to learn about take-back programs in your community. See the FDA's Safe Disposal of Medicines website (http://goo.gl/c4Rm4p) for more information if you do not have access to a take-back program.

Unless your doctor tells you otherwise, continue your normal diet.

Taking this medication will not prevent you from passing HIV to other people. Do not have unprotected sex or share razors or toothbrushes. Talk with your doctor about safe ways to prevent HIV transmission during sex. Sharing drug or medicine needles is never safe, even for a healthy person.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Early symptoms of lactic acidosis may get worse over time and this condition can be fatal. Get emergency medical help if you have even mild symptoms: muscle pain or weakness, numb or cold feeling in your arms and legs, trouble breathing, stomach pain, nausea with vomiting, fast or uneven heart rate, dizziness, or feeling very weak or tired.

Call your doctor at once if you have symptoms of liver problems: swelling around your midsection, upper stomach pain, nausea, loss of appetite, dark urine, or jaundice (yellowing of the skin or eyes).

Emtricitabine may increase your risk of certain infections or autoimmune disorders by changing the way your immune system works. Symptoms may occur weeks or months after you start treatment with emtricitabine. Tell your doctor if you have:

• signs of a new infection--fever, night sweats, swollen glands, mouth sores, diarrhea, stomach pain, weight loss;

• chest pain (especially when you breathe), dry cough, wheezing, feeling short of breath;

• cold sores, sores on your genital or anal area;

• rapid heart rate, feeling anxious or irritable, weakness or prickly feeling, problems with balance or eye movement;

• trouble speaking or swallowing, severe lower back pain, loss of bladder or bowel control; or

• swelling in your neck or throat (enlarged thyroid), menstrual changes, impotence, loss of interest in sex.

Common side effects of emtricitabine may include:

• headache, dizziness, weakness;

• indigestion, stomach pain, nausea, vomiting, diarrhea;

• sleep problems, strange dreams;

• rash, skin discoloration; or

• changes in the shape or location of body fat (especially in your arms, legs, face, neck, breasts, and waist).

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Other drugs may interact with emtricitabine, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all your current medicines and any medicine you start or stop using.

Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.

Keep a supply of emtricitabine on hand. Do not wait until you run out of medication to refill your prescription.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.