A nurse is reviewing laboratory results for a client and notes a serum lithium level of 1.6 mEq/L. Which of the following manifestations should the nurse expect the client to report?

A. Blurred vision and jerking motor movements are typically associated with severe lithium toxicity (levels >2.0 mEq/L), which requires urgent medical intervention. B. A serum lithium level of 1.6 mEq/L falls into the mild to moderate toxicity range. Clients may report gastrointestinal discomfort (nausea, vomiting, diarrhea), poor coordination, tremors, muscle weakness, and fatigue. These symptoms occur because lithium affects neuronal excitability and neuromuscular function, and early recognition allows for prompt dosage adjustment or temporary discontinuation to prevent progression to severe toxicity. C. Lip smacking and tongue thrusting are hallmark signs of tardive dyskinesia, a movement disorder related to long-term antipsychotic use, and are not linked to lithium therapy. D. Fever and fluctuating blood pressure are nonspecific and not characteristic of lithium toxicity, so they are not expected at this serum level.