Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Incidence not known
Black, tarry stools
bleeding gums
bloating
blood in the urine or stools
blurred vision
chills
constipation
cough
dark urine
decreased appetite
diarrhea
difficulty with swallowing
dizziness
dry mouth
fast heartbeat
fast, shallow breathing
fever
flushed, dry skin
fruit-like breath odor
general feeling of discomfort
general tiredness and weakness
increased hunger
increased thirst
increased urination
indigestion
light-colored stools
loss of appetite
muscle cramps, pain, stiffness, or spasms
nausea
pains in the stomach, side, or abdomen, possibly radiating to the back
pinpoint red spots on the skin
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
right upper abdominal or stomach pain and fullness
skin rash, hives, or itching
sleepiness
stomach discomfort
tightness in the chest
troubled breathing with exertion
unexplained weight loss
unusual bleeding or bruising
unusual tiredness or weakness
upper right abdominal or stomach pain
vomiting
yellow eyes or skin
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
Belching
burning, tingling, numbness or pain in the hands, arms, feet, or legs
depression
general feeling of discomfort or illness
headache
heartburn
indigestion
joint pain
sensation of pins and needles
sore throat
stabbing pain
stomach discomfort, upset, or pain
stuffy or runny nose
trouble sleeping
weight loss
Incidence not known
Hair loss or thinning of the hair
pale skin
sweating
weight gain around your neck, upper back, breast, face, or waist
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
 Lamivudine side effects (more detail)
