candybear - Some of the more common side effects of lithium are: a mild tremor, diarrhea, poyuria (peeing a lot), upset stomach, nausea, and dizziness. These are usually mild and disappear as your body adjusts to the drug and they get your blood level right.

It is important to know the signs that indicate that your lithium level is too high. If you experience a significant worsening of a usually mild tremor, &/or your speech becomes slurred, &/or you develop muscle weakness or twitching, &/or you have difficulty walking, you should contact your doctor or go to the local emergency department if any of these symptoms becomes pronounced.

Also, it is important to be aware of situations that can alter lithium levels. Dehydration, fever, and vomiting can all increase lithium levels. Crash diets or sodium restricted diets can also alter lithium levels

I hope that this is of some help. - Cam