Your prescribing doctor must have given you the dose of the Lithium
tablet. In my opinion you start with one tablet per day, you can take the tablet in the night with food. You then need to monitor the lithium level through blood test
. The level should be between 0.7-1.2mmol/L . The lithium levels need to be done ideally after 7 days, 2 weeks, 6 weeks and then 3 months. Once the dose is adjusted according to your body, you take the medicine for a year. Lithium takes few weeks to even months to fully establish its effects. I hope I have answered your query.