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What is the amount of water to drink per day when taking lithium? And what is the maximum recommended amount of caffeine in this case?

It is recommended to drink 1 to 2 liters of water per day when taking lithium in order to avoid dehydration. As for the maximum amount of caffeine recommended, there is no consensus on the exact quantity that may cause interaction with lithium. It is advised to maintain a relatively stable caffeine intake and inform your healthcare team of any changes in consumption to monitor the lithium levels in your blood. Excessive caffeine intake could potentially lead to decreased levels of lithium in the blood.