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If you have hepatitis B infection, your hepatitis symptoms may get worse or become very serious if you stop taking this medication. Talk with your doctor before stopping this medication. Your doctor will monitor liver tests for several months after you stop elvitegravir/cobicistat/emtricitabine/tenofovir alafenamide. Tell your doctor right away if you have symptoms of worsening liver problems.

Diarrhea, nausea, headache, or tiredness may occur. 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). Tell your doctor right away if you have any serious side effects, including: mental/mood changes (such as depression, anxiety), signs of kidney problems (such as change in the amount of urine, pink/bloody urine). Rarely, this medication can cause severe (sometimes fatal) liver and blood problems (lactic acidosis). Tell your doctor right away if you develop symptoms of liver problems (such as nausea/vomiting that doesn't stop, loss of appetite, stomach/abdominal pain, yellowing eyes/skin, dark urine) or lactic acidosis (such as deep/rapid breathing, drowsiness, nausea/vomiting, unusual weakness). 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. 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.

Some products that may interact with this drug are: adefovir, orlistat, other drugs that may affect the kidneys (including aminoglycosides such as amikacin/gentamicin). Do not take this medication with other HIV medications (such as ritonavir). Do not take this medication with other products that contain cobicistat, elvitegravir, emtricitabine, lamivudine, or tenofovir. This medication can slow down the removal of other medications from your body, which may affect how they work. Examples of affected drugs include dronedarone, eletriptan, eplerenone, ergot alkaloids (such as ergotamine, dihydroergotamine), salmeterol, tolvaptan, rivaroxaban, certain alpha blockers (such as alfuzosin, tamsulosin), certain benzodiazepines (such as midazolam, triazolam), certain statins (such as lovastatin, simvastatin), certain drugs to treat erectile dysfunction-ED or pulmonary hypertension (such as avanafil, sildenafil), among others. Other medications can affect the removal of this medication from your body, which may affect how this medication works. Examples include mitotane, rifampin, St. John's wort, certain drugs used to treat seizures (such as carbamazepine, oxcarbazepine, phenobarbital, phenytoin, primidone), among others. This medication may decrease the effectiveness of hormonal birth control such as pills, patch, or ring. This could cause pregnancy. This medication may also increase the risk of some hormonal birth control side effects. Talk to your doctor about other reliable forms of birth control, and use an effective barrier method (latex or polyurethane condoms/dental dams) during sexual activity to decrease the risk of spreading HIV to others. Tell your doctor if you have any new spotting or breakthrough bleeding, because these may be signs that your hormonal birth control is not working well.