Lithium Poisoning

Substance

Lithium is a commonly prescribed medication for bipolar disorder with a narrow therapeutic index. Therapeutic range: 0.6–1.2 mmol/L [1] [2]

Toxicity does not strictly correlate with serum levels

Brain concentration is more clinically relevant, especially in chronic toxicity

 

Common name

Lithium carbonate（most common）Lithium citrate

Trade names: Eskalith, Lithobid, Lithonate, Priadel

 

Involving system, [3]

 (1) Acute toxicity

Large ingestion in a lithium-naïve patient. High serum level, low CNS penetration initially, predominantly gastrointestinal symptoms.

(2) Chronic toxicity (most dangerous)

Long-term use with impaired renal clearance, Prominent neurologic toxicity

 (3) Acute-on-chronic toxicity (most common)

Acute ingestion on top of chronic therapy

Mixed presentation (GI + neurologic)

 Clinical pearl:  Chronic toxicity is associated with the worst outcomes

 

Toxico-kinetics, Absorption, Immediate-release: peak at 1–2 hours [2]

Sustained-release: peak at 4–5 hours (may have delayed/multiple peaks) [4]

Distribution: No protein binding, distributed in total body water

Brain equilibrium is delayed up to 24 hours [5]

Elimination: 95% renal excretion, Clearance: 10–40 mL/min

Prolonged in the elderly or those with CKD.

Renal handling, Lithium behaves like sodium, 80% reabsorbed in the proximal tubule [6]

 

Predisposing Factors increasing lithium levels: Volume depletion (Major Trigger!), Hyponatremia, Thiazides, NSAIDs, ACE inhibitors / ARBs [3] [7]

 

Presentation  

(A) Gastrointestinal (acute): Nausea, vomiting, Diarrhea [7][8]

 (B) Neurologic (most important) Tremor (fine → coarse) Ataxia, Confusion/delirium,

Seizures, Coma [7]

 (C) Renal, Nephrogenic diabetes insipidus (NDI), the most common chronic adverse effect, occurs in up to 40% of patients [9].

 (D) Endocrine, Hypothyroidism, Hyperparathyroidism/hypercalcemia [8][9]

 (E) Cardiac, T wave flattening, usually nonspecific ECG changes. Serious arrhythmias are rare [10].

 (F) Severe complication,  SILENT syndrome (Syndrome of Irreversible Lithium-Effectuated Neurotoxicity) , Persistent neurologic deficits > 2 months after discontinuation, Predominantly cerebellar dysfunction [11].

Risk factors: Fever, Dehydration. Concomitant antipsychotic use

Serum lithium level does NOT equal severity

 

Antidote and Management

Step 1: ABC stabilization, Airway usually preserved

Monitor for aspiration (due to vomiting)

Step 2: Gastrointestinal decontamination, NO NEED for using Activated charcoal

Ineffective (lithium is a monovalent ion)

Gastric lavage, Limited role (rapid absorption)

May use Whole bowel irrigation (WBI) [10]

Indications:  Sustained-release ingestion

Significant toxicity, No contraindications (e.g., ileus)

Step 3: Fluid resuscitation, Use 0.9% normal saline, Rate: 1.5–2 × maintenance

Improves renal perfusion, reduces lithium reabsorption

Step 4: Hemodialysis, based on ExTRIP (2015) recommendations [12].

Strong indications (regardless of level): Decreased consciousness Seizures, Life-threatening arrhythmias.

Suggested indications: Lithium > 4.0 mmol/L and Lithium > 2.5 mmol/L with symptoms.

Renal failure, and Failure of levels to decline; be aware of the rebound phenomenon  [13].  

 

Post-dialysis lithium levels may rise due to redistribution from intracellular compartments. Requires: Serial monitoring

Possible repeat dialysis, Modality First-line: Intermittent hemodialysis (IHD), If unstable: CRRT.  [14].

Emergency Department Approach, Treat the patient, not the number.”

 

Disposition

Asymptomatic with level <1.5 mEq/L, observation

Mild poisoning（1.5–2.0mEq/L）treat and observation

Neurologic manifestation: hospitalize, levels >2.0 mmol/L [10]

moderate-severe neurotoxicity: ICU [10]

 

References

[1]. https://pubmed.ncbi.nlm.nih.gov/19523343/

[2]. https://tapna.org.au/wp-content/uploads/2021/08/LithiumSummary-1628470971.4004.pdf

[3]. https://pubmed.ncbi.nlm.nih.gov/40281030/

[4]. https://canadiem.org/wp-content/uploads/2018/03/CC-lithium.pdf

[5]. https://pubmed.ncbi.nlm.nih.gov/708996/

[6]. https://pubmed.ncbi.nlm.nih.gov/2128949/

[7]. https://www.healthdirect.gov.au/lithium

[8]. https://my.clevelandclinic.org/health/diseases/25207-lithium-toxicity

[9]. https://pmc.ncbi.nlm.nih.gov/articles/PMC5164879/

[10]. https://www.ncbi.nlm.nih.gov/books/NBK499992/

[11]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11117426/

[12] https://pubmed.ncbi.nlm.nih.gov/25583292/

[13]. https://pubmed.ncbi.nlm.nih.gov/19393483/

[14]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11039482/

 

Edited by Yu-Jang Su, Mar 19, 2026