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If you have hepatitis B infection along with HIV, your hepatitis symptoms may get worse or become very serious if you stop taking lamivudine. Talk with your doctor before stopping this medication. Your doctor will perform liver function tests for several months after you stop lamivudine. Tell your doctor right away if you develop symptoms of worsening liver problems. Different brands of this drug have different amounts of drug. Do not switch brands of this medication without first checking with your doctor. If you have HIV infection (with or without hepatitis B infection), you should be taking the higher-strength dosage. Consult your doctor or pharmacist.

Headache, dizziness, nausea, diarrhea, or trouble sleeping 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. Rarely, lamivudine has caused severe (sometimes fatal) liver problems and a buildup of lactic acid in the blood (lactic acidosis). These serious side effects may occur more often in women and obese patients. Get medical help right away if you have any of the following serious symptoms, including: symptoms of liver problems (such as nausea/vomiting that doesn't stop, loss of appetite, stomach/abdominal pain, yellowing eyes/skin, dark urine), symptoms of lactic acidosis (such as deep/rapid breathing, drowsiness, nausea/vomiting). 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), stomach/back pain with nausea (pancreatitis), easy bleeding/bruising, signs of anemia (unusual tiredness, rapid heartbeat, pale/bluish skin). 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: orlistat, sorbitol. Emtricitabine is similar to lamivudine and should not be taken with this medication. Check the labels on all your HIV medicines because they may contain the same ingredients as found in this product. Taking too much of these drugs will not necessarily improve your condition, and may cause more side effects.