Lithium becomes toxic at serum levels above:

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Multiple Choice

Lithium becomes toxic at serum levels above:

Explanation:
Lithium has a narrow therapeutic window, so it’s crucial to keep levels within a safe range. The therapeutic range is about 0.6–1.2 mEq/L. Toxicity tends to begin when the serum level exceeds roughly 1.5 mEq/L. Therefore, among the numbers given, 1.5 mEq/L marks the onset of toxicity. Levels at 1.0 and 1.2 are still within therapeutic limits, while 2.0 mEq/L indicates more pronounced toxicity.

Lithium has a narrow therapeutic window, so it’s crucial to keep levels within a safe range. The therapeutic range is about 0.6–1.2 mEq/L. Toxicity tends to begin when the serum level exceeds roughly 1.5 mEq/L. Therefore, among the numbers given, 1.5 mEq/L marks the onset of toxicity. Levels at 1.0 and 1.2 are still within therapeutic limits, while 2.0 mEq/L indicates more pronounced toxicity.

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