Psychopharmacology and Psychiatry Updates Lithium Essentials: Monitoring, Drug Interactions, and Safety
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Mar 17, 2026 
David Osser, Associate Professor of Psychiatry at Harvard Medical School and psychopharmacology expert, gives concise clinical guidance on lithium. He reviews essential baseline labs, formulation differences, and why once-daily immediate-release dosing may protect kidneys. He covers starting doses, monitoring timing, interacting drugs, target levels for acute and maintenance care, tapering risks, and special population considerations.
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Get Kidney And Thyroid Baselines First
- Do obtain baseline kidney and thyroid tests before or just after starting lithium.
- Specifically check creatinine, BUN, eGFR, TSH, and consider CBC, urinalysis, calcium, PTH, vitamin D, and pregnancy test if applicable.
Use Immediate Release Once At Night
- Give immediate‑release lithium once daily at night to reduce renal risk.
- Short acting IR taken once at night allows a daily trough and was linked to least kidney damage on biopsy comparisons.
Nightly Trough Is Kidney Protective
- Once‑daily dosing lets lithium levels fall each day, and that daily dip appears less toxic to kidneys than constant levels.
- The nightly trough reduces total required dose by about 20% because renal excretion is slower at night.