Every drug has side effects. Here is a list of common lithium side effects, as noted on the popular website WebMD.com:
Common side effects of lithium can include:
Symptoms of lithium toxicity are potentially very dangerous and should be reported to your doctor immediately. These symptoms may include:
Diarrhea, nausea/vomiting, fever, unsteady gait, fainting, confusion, slurred speech, or rapid heart rate.
*Note that impaired thyroid function is in and of itself one of the leading medical causes of depression, anxiety and mood instability.