This drug is used with other HIV medications to help control HIV infection. It helps to decrease the amount of HIV in your body so your immune system can work better. This lowers your chance of getting HIV complications (such as new infections, cancer) and improves your quality of life.

Darunavir belongs to a class of drugs known as protease inhibitors. Darunavir must be given with certain other medications (such as cobicistat, ritonavir) to increase ("boost") the levels of darunavir. This helps darunavir work better.

Darunavir is not a cure for HIV infection. To decrease your risk of spreading HIV disease to others, continue to take all HIV medications exactly as prescribed by your doctor. Use an effective barrier method (latex or polyurethane condoms/dental dams) during sexual activity as directed by your doctor. Do not share personal items (such as needles/syringes, toothbrushes, and razors) that may have contacted blood or other body fluids. Consult your doctor or pharmacist for more details.

This medication is not recommended for use in children younger than 3 years due to the increased risk of serious side effects.

This section contains uses of this drug that are not listed in the approved professional labeling for the drug but that may be prescribed by your health care professional. Use this drug for a condition that is listed in this section only if it has been so prescribed by your health care professional.

This product may also be used to lessen the risk of HIV infection after contact with the virus (for example, due to a needle stick). Ask your doctor for more details.

Read the Patient Information Leaflet if available from your pharmacist before you start taking darunavir and each time you get a refill. If you are using the liquid form of this medication, carefully read the Instructions for Use provided with the medication. If you have any questions, ask your doctor or pharmacist.

Take this medication by mouth with food as directed by your doctor. Darunavir must be taken at the same time as certain other medications, usually once or twice a day. (See also Uses section.) If you have trouble swallowing the tablets, ask your doctor if you should use the liquid form.

If you are using the liquid form of this medication, shake the bottle well before each dose. Carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose.

The dosage is based on your age, lab tests, medical condition, and response to treatment. Children's dosage is also based on weight.

It is very important to keep taking this medication (and other HIV medications) exactly as prescribed by your doctor.

For the best effect, take this medication at evenly spaced times. To help you remember, take this medication at the same time(s) every day.

Do not take more or less of this drug than prescribed or stop taking it (or other HIV medicines) even for a short time unless directed to do so by your doctor. Skipping or changing your dose without approval from your doctor may cause the amount of virus to increase, make the infection more difficult to treat (resistant), or worsen side effects.

Since darunavir is always taken with other HIV medications, it may be difficult to tell whether darunavir is causing certain side effects. However, darunavir is known to cause diarrhea, nausea, vomiting, stomach pain, and headache. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

As your immune system gets stronger, it can begin to fight off infections you already had, possibly causing disease symptoms to come back. You could also have symptoms if your immune system becomes overactive. This reaction may happen at any time (soon after starting HIV treatment or many months later). Get medical help right away if you have any serious symptoms, including:

• unexplained weight loss
• severe tiredness
• muscle aches/weakness that doesn't go away
• headaches that are severe or don't go away
• joint pain
• numbness/tingling of the hands/feet/arms/legs
• vision changes
• signs of infection (such as fever, chills, swollen lymph nodes, trouble breathing, cough, non-healing skin sores)
• signs of an overactive thyroid (such as irritability, nervousness, heat intolerance, fast/pounding/irregular heartbeat, bulging eyes, unusual growth in the neck/thyroid known as a goiter)
• signs of a certain nerve problem known as Guillain-Barre syndrome (such as unsteadiness, loss of coordination, trouble swallowing/speaking/chewing, trouble moving your eyes)

This medication may rarely make your blood sugar rise, which can cause or worsen diabetes. Tell your doctor right away if you have symptoms of high blood sugar such as increased thirst/urination. If you already have diabetes, check your blood sugar regularly as directed and share the results with your doctor. Your doctor may need to adjust your diabetes medication, exercise program, or diet.

Get medical help right away if you have any very serious side effects, including:

• symptoms of a heart attack (such as chest/jaw/left arm pain, shortness of breath, unusual sweating)
• easy bruising/bleeding

This drug may rarely cause serious (possibly fatal) liver problems. Get medical help right away if you have any symptoms of liver damage, including:

• nausea/vomiting that doesn't stop
• severe stomach/abdominal pain
• dark urine
• yellowing eyes/skin

Changes in body fat may occur while you are taking this medication (such as increased fat in the upper back and stomach areas, decreased fat in the arms and legs). The cause and long-term effects of these changes are unknown. Discuss the risks and benefits of treatment with your doctor, as well as the possible use of exercise to reduce this side effect.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including:

• rash
• itching/swelling (especially of the face/tongue/throat)
• severe dizziness
• trouble breathing

Darunavir can commonly cause a rash that is usually not serious. However, you may not be able to tell it apart from a rare rash that could be a sign of a severe reaction. Get medical help right away if you develop any rash, especially with symptoms such as fever, tiredness, muscle/joint pain, blisters, mouth sores, or red/swollen eyes.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Before taking darunavir, 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, especially of:

• liver problems (such as hepatitis B or C)
• diabetes
• a certain bleeding problem (hemophilia)
• lipid problems (high cholesterol or triglycerides/fats)
• heart problems (coronary artery disease, heart attack)

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

Tell your doctor if you are pregnant before using this medication. Treatment can lower the risk of passing HIV infection to your baby. Discuss the risks and benefits with your doctor.

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.

Some of the products that may interact with this drug include:

• orlistat
• certain drugs used to treat seizures (such as carbamazepine, phenytoin, primidone)
• barbiturates (such as phenobarbital, secobarbital)
• a certain combination HIV medication (elvitegravir/cobicistat/emtricitabine/tenofovir)

Darunavir can slow down the removal of other drugs from your body, which may affect how they work. Examples of affected drugs include certain alpha blockers (such as alfuzosin, tamsulosin), certain benzodiazepines (midazolam, triazolam), bosutinib, dronedarone, ergot alkaloids (such as dihydroergotamine, ergotamine), certain drugs to treat erectile dysfunction-ED or pulmonary hypertension (such as avanafil, sildenafil), lomitapide, pimozide, ranolazine, rivaroxaban, salmeterol, certain "statin" cholesterol drugs (such as lovastatin, simvastatin), tolvaptan, among others.

Other medications can affect the removal of darunavir from your body, which may affect how darunavir works. Examples include apalutamide, garlic supplements, certain rifamycins (rifampin, rifapentine), St. John's Wort, among others.

This medication may decrease the effectiveness of hormonal birth control such as pills, patch, or ring. This could cause pregnancy. Discuss with your doctor or pharmacist if you should use reliable backup birth control methods while using this medication. Also tell your doctor if you have any new spotting or breakthrough bleeding, because these may be signs that your birth control is not working well.

Do not take this medication with other products that contain darunavir.

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.

Do not share this medication with others.

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

If you are taking this medication 2 times daily and you miss a dose, take it as soon as you remember. If it is less than 6 hours before the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.

If you are taking this medication once daily and you miss a dose, take it as soon as you remember. If it is less than 12 hours before the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.

Store at room temperature away from light and moisture. Do not store in the bathroom. Keep the liquid form of this medication in the original container. Do not refrigerate or freeze the liquid form. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.