Drug interactions
Green tea + Guarana
Severity: Minor
Green tea and Guarana: 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
Both green tea and guarana contain caffeine, so combined use adds to total caffeine intake. This may cause nervousness, insomnia, palpitations or gastrointestinal upset, particularly in sensitive people or with large amounts.
What this interaction means in plain words
Green tea and Guarana have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Additive pharmacodynamic effects of caffeine (adenosine receptor antagonism) from both products.
What to do
Advise patients to count caffeine from all sources and reduce intake if jitteriness, tachycardia or insomnia occurs.
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 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 Guarana?
MediHelp rates the interaction as minor. Green tea and Guarana have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Both green tea and guarana contain caffeine, so combined use adds to total caffeine intake. This may cause nervousness, insomnia, palpitations or gastrointestinal upset, particularly in sensitive people or with large amounts.
How serious is the interaction between Green tea and Guarana?
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 count caffeine from all sources and reduce intake if jitteriness, tachycardia or insomnia occurs.
What other medicines interact with Green tea?
MediHelp also lists interactions of Green tea with, for example, Adenosine, Benzphetamine, Bortezomib. The full list is on the Green tea page.
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