The relationship between serum lithium levels and clinical response

Area of Science:

• Psychopharmacology
• Clinical Chemistry

Background:

• The standard therapeutic range for serum lithium is 0.8–1.2 mmol/L for treating mental illness.
• The evidence underpinning this specific range is not extensively documented.

Purpose of the Study:

• To critically review the existing evidence for the recommended serum lithium levels.
• To assess the pharmacokinetic and analytical challenges related to lithium monitoring.

Main Methods:

• Literature review of clinical studies investigating lithium dosage and serum concentration.
• Assessment of treatment studies for indirect evidence linking therapeutic outcomes to serum levels.

Main Results:

• The evidence supporting the 0.8–1.2 mmol/L serum lithium range is limited.
• Pharmacokinetic properties and assay difficulties impact lithium level interpretation.

Conclusions:

• The basis for the current serum lithium level recommendations requires further investigation.
• Clinical practice may need to re-evaluate the strict adherence to the 0.8–1.2 mmol/L range based on available evidence.