# A client with bipolar disorder has been taking lithium carbonate 600 mg orally three times daily for 3 weeks. During a follow-up visit the client reports new symptoms. Which finding is most concerning and warrants immediate provider notification?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=362894&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

A client with bipolar disorder has been taking lithium carbonate 600 mg orally three times daily for 3 weeks. During a follow-up visit the client reports new symptoms. Which finding is most concerning and warrants immediate provider notification?

## Option

1. Fine hand tremor on awakening
2. 1 kg weight gain over 2 weeks
3. Coarse hand tremor, slurred speech, and ataxia **✔ Correct answer**
4. Increased thirst and urination

**Correct answer: 3**

## Explanation

Lithium has a narrow therapeutic index (0.6 to 1.2 mEq/L). Coarse tremor, dysarthria (slurred speech), and ataxia indicate moderate to severe toxicity (level above 1.5 mEq/L) and require immediate hold, lithium level draw, and provider notification. Polyuria and polydipsia, fine tremor on awakening, and mild weight gain are common expected side effects at therapeutic levels.

## In-depth explanation

Clinical Judgment
Lithium toxicity is staged: mild 1.5-2.0 (coarse tremor, GI), moderate 2.0-2.5 (ataxia, dysarthria, confusion), severe >2.5 (seizure, coma). Ataxia + dysarthria + coarse tremor = moderate or worse toxicity.

Memory Tip
Lithium toxicity ABCD: Ataxia, Blurred speech, Coarse tremor, Diarrhea

KR vs US
Therapeutic range and toxicity thresholds match worldwide. Korean psychiatric outpatients also draw quarterly lithium levels and check renal/thyroid function every 6 months.

## Clinical scenario

Clinical Practice Guide
APA bipolar disorder guidelines list lithium as first-line for maintenance and acute mania. Therapeutic range: 0.6-1.2 mEq/L (acute mania up to 1.5). Toxicity stages: mild 1.5-2.0 (coarse tremor, GI), moderate 2.0-2.5 (ataxia, dysarthria, confusion), severe >2.5 (seizure, coma, death). Hemodialysis indicated if level >4 or symptomatic at >2.5.

Caution
Dehydration, low sodium intake, NSAIDs, ACE inhibitors, and thiazide diuretics raise lithium levels. Counsel clients to maintain consistent fluid and salt intake and to avoid OTC NSAIDs without consultation.

## Key concepts

- **Lithium carbonate** — First-line mood stabilizer for bipolar disorder. Narrow therapeutic index 0.6-1.2 mEq/L. Excreted unchanged by kidneys; renal function and serum levels checked every 3-6 months. Held before procedures with anticipated dehydration.
- **Lithium toxicity** — Mild (1.5-2.0): coarse tremor, GI distress, polyuria. Moderate (2.0-2.5): ataxia, slurred speech, confusion, muscle twitching. Severe (>2.5): seizure, coma, cardiovascular collapse. Hemodialysis for severe toxicity.
- **Narrow therapeutic index** — Drugs where toxic dose is close to therapeutic dose. Examples: lithium, warfarin, digoxin, theophylline, phenytoin, vancomycin. Require routine serum level monitoring and patient education on symptom recognition.

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