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Moderate· moderate-evidence
May be possible under supervision — talk to your prescriber or pharmacist before combining.
Green tea's caffeine and mild diuretic effect can alter lithium excretion. Keep intake steady — abrupt increases or stops can shift lithium levels out of range.
Caffeine increases renal blood flow and lithium clearance, while sudden caffeine withdrawal reverses the effect; theophylline-related diuresis adds variability.
Source: Natural Medicines Database · Reviewed September 2026
Green Tea + Lithium: use caution. May be possible under supervision — talk to your prescriber or pharmacist before combining. Green tea's caffeine and mild diuretic effect can alter lithium excretion. Keep intake steady — abrupt increases or stops can shift lithium levels out of range.
Caffeine increases renal blood flow and lithium clearance, while sudden caffeine withdrawal reverses the effect; theophylline-related diuresis adds variability.
Do not stop either abruptly on your own. Talk to your prescriber or pharmacist promptly — bring this page to your appointment.
Educational information only — not medical advice. Always verify with a healthcare professional.