Drug interactions
Caffeine + Ephedrine
Severity: Major
Caffeine and Ephedrine: major 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 are stimulants, and combined use increases the risk of tachycardia, hypertension, tremor, anxiety, insomnia and arrhythmia. Such combinations have been used in weight-loss products and have been linked to serious cardiovascular events.
What this interaction means in plain words
Caffeine and Ephedrine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Caffeine belongs to Miscellaneous; Ephedrine belongs to Cardiovascular.
Why it happens
Additive sympathomimetic and CNS stimulation (indirect adrenergic release by ephedrine plus adenosine antagonism and phosphodiesterase inhibition by caffeine).
What to do
Avoid combined stimulant products and limit caffeine intake during ephedrine use; monitor blood pressure and heart rate, particularly in cardiovascular disease.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Caffeine
- Caffeine + Fezolinetant Major
- Caffeine + Methylenedioxymethamphetamine Major
- Caffeine + Selegiline transdermal Major
- Adenosine + Caffeine Moderate
- Benzphetamine + Caffeine Moderate
- Caffeine + Ciprofloxacin Moderate
Other interactions of Ephedrine
- Ephedrine + Isocarboxazid Contraindicated
- Ephedrine + Phenelzine Contraindicated
- Ephedrine + Procarbazine Contraindicated
- Ephedrine + Rasagiline Contraindicated
- Ephedrine + Selegiline Contraindicated
- Ephedrine + Tranylcypromine Contraindicated
Frequently asked questions
Can I take Caffeine with Ephedrine?
MediHelp rates the interaction as major. Caffeine and Ephedrine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Both are stimulants, and combined use increases the risk of tachycardia, hypertension, tremor, anxiety, insomnia and arrhythmia. Such combinations have been used in weight-loss products and have been linked to serious cardiovascular events.
How serious is the interaction between Caffeine and Ephedrine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combined stimulant products and limit caffeine intake during ephedrine use; monitor blood pressure and heart rate, particularly in cardiovascular disease.
What other medicines interact with Caffeine?
MediHelp also lists interactions of Caffeine with, for example, Fezolinetant, Methylenedioxymethamphetamine, Selegiline transdermal. The full list is on the Caffeine page.
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