A nurse is preparing discharge teaching for a patient starting lithium therapy for bipolar disorder. Which of the following instructions should the nurse include to ensure safe and effective use of lithium?

"Avoid all physical activity to reduce the risk of dehydration."

"You should stop the medication immediately if you experience increased thirst or frequent urination."

"Maintain a consistent salt and fluid intake daily to help prevent hum toxicity"

"You do not need regular blood tests once you feel better on the medication"