Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
This medication may cause lactic acidosis. Lactic acidosis can start slowly and get worse over time. Get emergency medical help if you have even mild symptoms of lactic acidosis, such as: muscle pain or weakness, numb or cold feeling in your arms and legs, trouble breathing, stomach pain, nausea with vomiting, fast or uneven heart rate, dizziness, or feeling very weak or tired.
Stop using Lamivudine and call your doctor at once if you have a serious side effect such as:
- signs of a new infection such as fever, chills, sore throat, flu symptoms, easy bruising or unusual bleeding, loss of appetite, mouth sores;
- severe pain in your upper stomach spreading to your back, nausea and vomiting, fast heart rate;
- nausea, upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
- increased sweating, tremors in your hands, anxiety, feeling irritable, sleep problems (insomnia);
- diarrhea, unexplained weight loss, menstrual changes, impotence, loss of interest in sex;
- swelling in your neck or throat (enlarged thyroid);
- problems with walking, breathing, speech, swallowing, or eye movement; or
- severe lower back pain, loss of bladder or bowel control.
Less serious side effects may include:
- mild tired feeling;
- runny or stuffy nose;
- mild diarrhea; or
- changes in the shape or location of body fat (especially in your arms, legs, face, neck, breasts, and trunk).
This is not a complete list of side effects and others may occur.