Drug interactions
Caffeine + Methamphetamine
Severity: Moderate
Caffeine and Methamphetamine: 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
Caffeine adds to the stimulant effects of methamphetamine, which can lead to jitteriness, insomnia, tachycardia, and higher blood pressure. The effect is generally dose-related and more noticeable with large caffeine intake.
What this interaction means in plain words
Caffeine and Methamphetamine 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.
Caffeine belongs to Miscellaneous; Methamphetamine belongs to Central Nervous System.
Why it happens
Additive CNS and cardiovascular stimulation (adenosine receptor antagonism plus catecholamine release).
What to do
Advise limiting caffeine intake from coffee, energy drinks and supplements. Monitor heart rate, blood pressure and sleep.
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 Methamphetamine
- Isocarboxazid + Methamphetamine Contraindicated
- Linezolid + Methamphetamine Contraindicated
- Methamphetamine + Phenelzine Contraindicated
- Methamphetamine + Procarbazine Contraindicated
- Methamphetamine + Rasagiline Contraindicated
- Methamphetamine + Safinamide Contraindicated
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 Methamphetamine?
MediHelp rates the interaction as moderate. Caffeine and Methamphetamine 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. Caffeine adds to the stimulant effects of methamphetamine, which can lead to jitteriness, insomnia, tachycardia, and higher blood pressure. The effect is generally dose-related and more noticeable with large caffeine intake.
How serious is the interaction between Caffeine and Methamphetamine?
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 caffeine intake from coffee, energy drinks and supplements. Monitor heart rate, blood pressure and sleep.
What other medicines interact with Methamphetamine?
MediHelp also lists interactions of Methamphetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Methamphetamine page.
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