What is the therapeutic range for lithium and a key safety monitoring practice?

• A. Lithium typically 0.6–1.2 mEq/L; monitor renal function and electrolytes with regular serum levels
• B. Lithium 2.0–3.0 mEq/L; monitor liver enzymes and bilirubin
• C. Lithium 0.1–0.4 mEq/L; monitor thyroid function only
• D. Lithium 1.5–2.0 mEq/L; monitor glucose levels

Answer: (A)

Lithium works best when kept within a narrow blood level to provide mood stabilization while avoiding toxicity. The standard therapeutic range is about 0.6 to 1.2 mEq/L, which gives a balance between efficacy and safety. Because lithium is cleared by the kidneys, the most important safety practice is regular monitoring of kidney function and electrolytes, along with periodic serum lithium level checks. This helps catch early signs of nephrotoxicity or electrolyte imbalances (for example, sodium fluctuations can affect lithium levels) and prevents toxicity from accumulating. While thyroid function should be watched over long-term use, the critical safety focus in daily management is renal function and serum lithium monitoring. The other ranges and monitoring choices aren’t aligned with how lithium is processed and monitored in practice.