Hydrochlorothiazide and Lithium: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Hydrochlorothiazide and Lithium unless specifically directed by your doctor.
How Hydrochlorothiazide interacts with Lithium
Thiazide diuretics increase proximal tubular sodium and lithium reabsorption, reducing renal lithium clearance by 25-40% and increasing the risk of lithium toxicity.
What you should do
If a thiazide is needed, reduce lithium dose by approximately 50%, check serum lithium within 5-7 days, and educate the patient about signs of toxicity.
Key facts
Severity
Major — avoid combination
Mechanism
Thiazide diuretics increase proximal tubular sodium and lithium reabsorption, reducing renal lithium clearance by 25-40%...
Action
If a thiazide is needed, reduce lithium dose by approximately 50%, check serum lithium within 5-7 days, and educate the ...
Frequently asked questions
Can I take Hydrochlorothiazide and Lithium together?
No — this combination should generally be avoided. If a thiazide is needed, reduce lithium dose by approximately 50%, check serum lithium within 5-7 days, and educate the patient about signs of toxicity.
What is the severity of this interaction?
The interaction between Hydrochlorothiazide and Lithium is classified as Major — avoid combination. Thiazide diuretics increase proximal tubular sodium and lithium reabsorption, reducing renal lithium clearance by 25-40% and increasing the risk of lithium toxicity.
What should I do if I'm prescribed both?
If a thiazide is needed, reduce lithium dose by approximately 50%, check serum lithium within 5-7 days, and educate the patient about signs of toxicity. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.