Get emergency medical help if you have signs of an allergic reaction to lithium: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Too much lithium in your body can cause death. Lithium toxicity can occur if you take only slightly more than a recommended dose.
Stop using this medicine and call your doctor right away if you have symptoms of lithium toxicity: muscle weakness, twitching, drowsiness, feeling light-headed, mood changes, blurred vision, ringing in your ears, irregular heartbeats, confusion, slurred speech, clumsiness, trouble breathing, or seizures.
Call your doctor at once if you have:
a light-headed feeling, like you might pass out;
shortness of breath;
fever, increased thirst or urination;
weakness, dizziness or spinning sensation;
memory problems, hallucinations;
problems with balance or muscle movement;
loss of bowel or bladder control;
a seizure (blackout or convulsions);
low sodium level - headache, confusion, slurred speech, severe weakness, vomiting, loss of coordination, feeling unsteady;
thyroid problems - weight gain or loss, muscle pain, tremors, feeling hot or cold, changes in your skin or hair, sweating, feeling weak or tired, fast or pounding heartbeats, increased bowel movements, feeling anxious or agitated;
dehydration symptoms - feeling very thirsty or hot, being unable to urinate, heavy sweating, or hot and dry skin; or
increased pressure inside the skull -severe headaches, ringing in your ears, dizziness, nausea, vision problems, pain behind your eyes.
Seek medical attention right away if you have symptoms of serotonin syndrome, such as: agitation, hallucinations, fever, sweating, shivering, fast heart rate, muscle stiffness, twitching, loss of coordination, nausea, vomiting, or diarrhea.
Common lithium side effects may include:
dizziness, drowsiness;
tremors in your hands;
trouble walking;
dry mouth, increased thirst or urination;
nausea, vomiting, loss of appetite;
rash; or
blurred vision.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Lithium side effects (more detail)
