Drug interactions
Green tea + Lithium
Severity: Minor
Green tea and Lithium: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Green tea contains caffeine, which increases renal lithium clearance, so abrupt reduction in caffeine intake can raise serum lithium levels. Heavy habitual consumption followed by sudden cessation may therefore lead to lithium toxicity.
What this interaction means in plain words
Green tea and Lithium have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Green tea belongs to Gastrointestinal Tract; Lithium belongs to Central Nervous System.
Why it happens
Caffeine increases renal lithium excretion, so withdrawal reduces clearance.
What to do
Advise patients to keep caffeine intake consistent, and recheck serum lithium if consumption changes substantially.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Lithium
- Lithium + Thioridazine Contraindicated
- Lithium + Vandetanib Contraindicated
- Aceclofenac + Lithium Major
- Acemetacin + Lithium Major
- Amisulpride + Lithium Major
- Amlodipine-benazepril + Lithium Major
Other interactions of Green tea
- Adenosine + Green tea Moderate
- Benzphetamine + Green tea Moderate
- Bortezomib + Green tea Moderate
- Dextroamphetamine + Green tea Moderate
- Diethylpropion + Green tea Moderate
- Ephedrine + Green tea Moderate
Frequently asked questions
Can I take Green tea with Lithium?
MediHelp rates the interaction as minor. Green tea and Lithium have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Green tea contains caffeine, which increases renal lithium clearance, so abrupt reduction in caffeine intake can raise serum lithium levels. Heavy habitual consumption followed by sudden cessation may therefore lead to lithium toxicity.
How serious is the interaction between Green tea and Lithium?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise patients to keep caffeine intake consistent, and recheck serum lithium if consumption changes substantially.
What other medicines interact with Lithium?
MediHelp also lists interactions of Lithium with, for example, Thioridazine, Vandetanib, Aceclofenac. The full list is on the Lithium page.
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