Final answer:
The nurse should include the statement, 'We will monitor your lithium levels closely while you are taking this medication.' Monitoring lithium levels is important to ensure that the client is receiving the appropriate dose and to prevent toxicity.
Step-by-step explanation:
The nurse should include the statement, 'We will monitor your lithium levels closely while you are taking this medication.' Monitoring lithium levels is important to ensure that the client is receiving the appropriate dose and to prevent toxicity. It is not correct to say that lithium is addictive and needs to be discontinued in six months (option b). Additionally, a diuretic may be prescribed to manage lithium-induced polyuria (option c), but it is not specifically mentioned as a solution for trouble urinating. Weight gain is not directly associated with lithium toxicity (option d).