Because it has a narrow therapeutic window, lithium levels above which of the following leads to toxicity?
a. 0.6 mEq/L
b. 1.2 mEq/L
c. 1.4 mEq/L
d. 1.5 mEq/L
D
Lithium levels above 1.5 mEq/L can lead to toxicity. Higher levels than this can produce toxicity symptoms such as lethargy and dizziness. Extremely high levels may result in cardiac toxicity, leading to death. Lithium levels are most commonly maintained between 0.6 mEq/L and 1.2 mEq/L.
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