Lenacapavir is used in adults with other antiviral drugs to treat HIV, the virus that can cause acquired immunodeficiency syndrome (AIDS). Lenacapavir is not a cure for HIV or AIDS.

Lenacapavir is given after several other HIV medications did not work, have stopped working or could not be tolerated.

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

There may be other reasons you should not use lenacapavir in combination with certain medicines, such as efavirenz, nevirapine, rifabutin, rifampin, rifapentine, carbamazepine, oxcarbazepine, phenytoin, primidone, dexamethasone, prednisone, St. John's wort, phenobarbital or other barbiturate medicine.

Tell your doctor if you have ever had:

• an autoimmune disorder such as Graves' disease, polymyositis, or Guillain-Barré syndrome.

To prevent HIV in a newborn baby, use all medications to control your infection during pregnancy. Your name may be listed on an antiviral pregnancy registry.

It is not known if lenacapavir will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

Women with HIV should not breastfeed. The virus can pass to your baby in your breast milk.

Use Lenacapavir (Oral/Injection) (Oral,Subcutaneous) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

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

Lenacapavir can affect your immune system (even weeks or months after you've used this medicine). Tell your doctor if you have:

• signs of a new infection--fever, night sweats, swollen glands, cold sores, cough, wheezing, diarrhea, weight loss;
• trouble speaking or swallowing, problems with balance or eye movement, weakness or prickly feeling; or
• swelling in your neck or throat (enlarged thyroid), menstrual changes, impotence.

Common side effects may include:

• bruising, swelling, warmth, redness, oozing, or bleeding where an injection was given; or
• nausea.

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.

Follow your doctor's instructions about any restrictions on food, beverages, or activity.