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The most important information to emphasize to a client receiving lithium for bipolar illness is the need for regular evaluation of serum lithium levels, which is crucial for ensuring the medication remains within the therapeutic range. Lithium has a narrow therapeutic window, meaning the difference between a therapeutic dose and a toxic dose is small. Regular monitoring helps prevent toxicity, which can lead to serious side effects or complications.

Additionally, having blood drawn during specific times, such as summer months, is not as critical as the consistent monitoring every 1-3 months, which is necessary to manage the patient's treatment effectively. Regular follow-up helps healthcare providers adjust doses if necessary and check for any adverse effects, making it a fundamental part of treatment for individuals on lithium therapy. This emphasis on monitoring aligns with best practices in managing patients on lithium for bipolar disorder, ensuring their safety and the effectiveness of their treatment regimen.