Lithium: Uses, Side Effects and Monitoring
A patient guide to Lithium — a mood stabilizer for bipolar disorder requiring regular blood monitoring — uses, side effects, monitoring requirements, and precautions.
Lithium is a well-established mood stabilizer with strong evidence for treating and preventing episodes of bipolar disorder, and is also notable for its specific evidence in reducing suicide risk. Because lithium has a narrow therapeutic range, regular blood monitoring is an essential part of safe treatment.
Uses
- Bipolar disorder — treatment of manic episodes and long-term maintenance to prevent relapse
- Augmentation of antidepressant treatment in some cases of depression
Common Side Effects
- Fine hand tremor
- Increased thirst and urination
- Mild gastrointestinal upset
- Weight gain
Monitoring — Essential for Safe Use
Because lithium has a narrow therapeutic range — meaning the effective dose is relatively close to a potentially toxic dose — regular blood tests to check lithium levels are essential, particularly when starting or adjusting the dose, and periodically during long-term treatment. Kidney function and thyroid function are also monitored periodically, as lithium can affect both over the long term.
Precautions
- Dehydration, certain medications (including some pain relievers such as NSAIDs, and some blood pressure medications), and reduced kidney function can increase lithium levels and the risk of toxicity
- Signs of lithium toxicity — including significant tremor, confusion, vomiting, or unsteadiness — require urgent medical attention
- Maintaining consistent fluid and salt intake is important, as significant changes can affect lithium levels
- Use during pregnancy requires specialist, individualised discussion given specific considerations
Frequently Asked Questions
Frequently Asked Questions
Why does Lithium require regular blood tests?
Lithium has a narrow gap between an effective dose and a potentially toxic dose, so regular blood level monitoring ensures the dose remains both effective and safe.
What should I do if I have symptoms of illness like vomiting or diarrhoea while on Lithium?
Significant vomiting, diarrhoea, or reduced fluid intake can affect lithium levels; contact your psychiatrist promptly if this occurs, as temporary adjustments may be needed.
Can I take pain relievers while on Lithium?
Some common pain relievers (such as NSAIDs like ibuprofen) can increase lithium levels; check with your psychiatrist or pharmacist before taking new medications, including over-the-counter ones.
Important Note
This page provides general educational information about Lithium and does not replace individual medical advice. Regular blood monitoring is essential for safe use — always attend scheduled blood tests and report any symptoms of toxicity urgently.
Reviewed by Dr. Muhammad Shoaib Zafar, Consultant Psychiatrist.
Frequently asked questions
Why does Lithium require regular blood tests?
Lithium has a narrow gap between an effective dose and a potentially toxic dose, so regular blood level monitoring ensures the dose remains both effective and safe.
What should I do if I have symptoms of illness like vomiting or diarrhoea while on Lithium?
Significant vomiting, diarrhoea, or reduced fluid intake can affect lithium levels; contact your psychiatrist promptly if this occurs, as temporary adjustments may be needed.
Can I take pain relievers while on Lithium?
Some common pain relievers (such as NSAIDs like ibuprofen) can increase lithium levels; check with your psychiatrist or pharmacist before taking new medications, including over-the-counter ones.