Drug interactions
Green tea + Phentermine
Severity: Moderate
Green tea and Phentermine: moderate 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
Phentermine is a sympathomimetic stimulant, and caffeine in green tea adds to its effects. This may cause insomnia, anxiety, palpitations and higher blood pressure.
What this interaction means in plain words
Green tea and Phentermine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Green tea belongs to Gastrointestinal Tract; Phentermine belongs to Central Nervous System.
Why it happens
Additive CNS and sympathomimetic stimulation from caffeine and phentermine.
What to do
Advise limiting green tea and other caffeine sources, and monitor blood pressure and heart rate.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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
Other interactions of Phentermine
- Isocarboxazid + Phentermine Contraindicated
- Linezolid + Phentermine Contraindicated
- Phenelzine + Phentermine Contraindicated
- Phentermine + Procarbazine Contraindicated
- Phentermine + Rasagiline Contraindicated
- Phentermine + Selegiline Contraindicated
Frequently asked questions
Can I take Green tea with Phentermine?
MediHelp rates the interaction as moderate. Green tea and Phentermine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Phentermine is a sympathomimetic stimulant, and caffeine in green tea adds to its effects. This may cause insomnia, anxiety, palpitations and higher blood pressure.
How serious is the interaction between Green tea and Phentermine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise limiting green tea and other caffeine sources, and monitor blood pressure and heart rate.
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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