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Before using lenacapavir, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor. If you have HIV infection, treatment can lower the risk of passing HIV infection to your baby, and this medication may be part of that treatment.

This medication passes into breast milk. Because breast milk may transmit HIV, consult your doctor before breastfeeding.

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Other medications can affect the removal of lenacapavir from your body, which may affect how lenacapavir works. Examples include certain other HIV drugs (such as atazanavir/cobicistat, atazanavir/ritonavir, efavirenz, nevirapine, tipranavir/ritonavir), rifamycins (such as rifampin, rifabutin), certain drugs used to treat seizures (such as carbamazepine, oxcarbazepine, phenobarbital, phenytoin), St. John's wort, among others.

This medication can slow down the removal of other medications from your body (for up to 9 months after the last dose), which may affect how they work. Examples of affected drugs include elacestrant, ergot drugs (such as dihydroergotamine, ergotamine), flibanserin, lomitapide, rivaroxaban, among others.

If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call 1-800-222-1222. Canada residents can call 1-844-764-7669.

It is important to get each dose of this medication as scheduled. If you miss a dose, ask your doctor or pharmacist right away for a new dosing schedule.

Not applicable. This product is given in a hospital or clinic or doctor's office and will not be stored at home.

If you are using this medication to prevent HIV infection, you must first get tested to be sure you are HIV-negative. Your doctor will perform lab tests before starting this medication and during treatment to make sure that you do not have HIV infection. Using this medication will not always prevent HIV infection. To get the most benefit from it, use this medication exactly as directed, and follow all prevention actions. (See also Uses section.) Tell your doctor right away if you have any signs of HIV infection (such as sore throat that doesn't go away, tiredness, fever, night sweats, diarrhea, joint/muscle aches, enlarged lymph nodes).

Lab and/or medical tests (such as viral load, T-cell counts) should be done while you are using this medication. Keep all medical and lab appointments. Consult your doctor for more details.

Read the Patient Information Leaflet if available from your pharmacist before you start using lenacapavir and each time you get a refill. If you have any questions, ask your doctor or pharmacist.

This medication is given by injection under the skin as directed by your doctor, usually once every 6 months. It is given by injection into the stomach/abdomen area by a health care professional. At the beginning of treatment, you will also be using the tablet form of the medication for 2 or 3 doses. Follow your doctor's instructions carefully on when to take the tablet form of lenacapavir and when to get your injection of lenacapavir.

It is very important to keep using this medication (and other HIV medications) exactly as prescribed by your doctor. Do not skip any doses.

For the best effect, use this medication at evenly spaced times. To help you remember, mark your calendar with a reminder. If you miss or will miss a planned injection by more than 2 weeks, tell your health care professional right away so that you may be given directions for your continued HIV treatment.

Do not stop using this drug (or other HIV medicines) even for a short time unless directed to do so by your doctor. Doing so may cause the amount of virus to increase, make the infection more difficult to treat (resistant).