Which mood stabilizer requires monitoring of serum levels in the range 0.6-0.8 mmol/L?

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Multiple Choice

Which mood stabilizer requires monitoring of serum levels in the range 0.6-0.8 mmol/L?

Explanation:
The key idea is that some mood stabilizers require regular blood level checks because they have a narrow therapeutic window. Lithium is the classic example. For long-term maintenance, clinicians target a trough serum level around 0.6 to 0.8 mmol/L to balance efficacy with toxicity risk. Keeping levels in this range helps control mood symptoms while minimizing adverse effects on the kidneys and thyroid, since lithium can cause renal impairment and hypothyroidism with higher levels. Serum lithium is measured in mmol/L (equivalently mEq/L for a monovalent ion), which is why this specific range is given. Other mood stabilizers don’t use this exact range in mmol/L: valproate is monitored in mcg/mL, lamotrigine levels aren’t routinely tied to a fixed serum target, and clozapine is monitored mainly for hematologic safety (ANC), not for a fixed serum level.

The key idea is that some mood stabilizers require regular blood level checks because they have a narrow therapeutic window. Lithium is the classic example. For long-term maintenance, clinicians target a trough serum level around 0.6 to 0.8 mmol/L to balance efficacy with toxicity risk. Keeping levels in this range helps control mood symptoms while minimizing adverse effects on the kidneys and thyroid, since lithium can cause renal impairment and hypothyroidism with higher levels. Serum lithium is measured in mmol/L (equivalently mEq/L for a monovalent ion), which is why this specific range is given.

Other mood stabilizers don’t use this exact range in mmol/L: valproate is monitored in mcg/mL, lamotrigine levels aren’t routinely tied to a fixed serum target, and clozapine is monitored mainly for hematologic safety (ANC), not for a fixed serum level.

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