The brain usually acclimates to it in time. Just make sure you're taking the medications regularly, and having around 2.5-3 litres of water a day to maintain serum lithium levels.
Health Tips
In case you're having symptoms of Vomiting, excessive sweating, or diarrhoea, consult a Physician for control of your symptoms, and consult your Psychiatrist for advice regarding Lithium at the same time.