Drug interactions
Caffeine + Guarana
Severity: Moderate
Caffeine and Guarana: 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
Guarana naturally contains caffeine, so taking it with caffeine produces additive stimulant effects. Excessive combined intake can cause tachycardia, palpitations, anxiety, tremor and insomnia.
What this interaction means in plain words
Caffeine and Guarana 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.
Why it happens
Additive pharmacodynamic effect, since guarana contains caffeine and related methylxanthines acting as adenosine receptor antagonists.
What to do
Count guarana caffeine content toward total daily caffeine intake and limit combined use, especially in patients with arrhythmias, hypertension or anxiety.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Caffeine and Guarana, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Caffeine
- Caffeine + Ephedrine Major
- Caffeine + Fezolinetant Major
- Caffeine + Methylenedioxymethamphetamine Major
- Caffeine + Selegiline transdermal Major
- Adenosine + Caffeine Moderate
- Benzphetamine + Caffeine Moderate
Frequently asked questions
Can I take Caffeine with Guarana?
MediHelp rates the interaction as moderate. Caffeine and Guarana 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. Guarana naturally contains caffeine, so taking it with caffeine produces additive stimulant effects. Excessive combined intake can cause tachycardia, palpitations, anxiety, tremor and insomnia.
How serious is the interaction between Caffeine and Guarana?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Count guarana caffeine content toward total daily caffeine intake and limit combined use, especially in patients with arrhythmias, hypertension or anxiety.
What other medicines interact with Caffeine?
MediHelp also lists interactions of Caffeine with, for example, Ephedrine, Fezolinetant, Methylenedioxymethamphetamine. The full list is on the Caffeine page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
