Drug interactions
Caffeine + Codeine
Severity: Minor
Caffeine and Codeine: 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
Caffeine is a stimulant and may partly counter opioid drowsiness, but it does not reverse respiratory depression. Caffeine is often combined with codeine in analgesic products to enhance pain relief.
What this interaction means in plain words
Caffeine and Codeine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Caffeine belongs to Miscellaneous; Codeine belongs to Musculoskeletal.
Why it happens
Opposing CNS effects; caffeine may modestly enhance analgesia through adenosine receptor antagonism.
What to do
No specific action is needed; do not assume caffeine protects against opioid overdose or sedation.
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 Codeine
- Alvimopan + Codeine Contraindicated
- Codeine + Isocarboxazid Contraindicated
- Codeine + Olanzapine / samidorphan Contraindicated
- Codeine + Phenelzine Contraindicated
- Codeine + Tranylcypromine Contraindicated
- Alfentanil + Codeine Major
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 Codeine?
MediHelp rates the interaction as minor. Caffeine and Codeine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Caffeine is a stimulant and may partly counter opioid drowsiness, but it does not reverse respiratory depression. Caffeine is often combined with codeine in analgesic products to enhance pain relief.
How serious is the interaction between Caffeine and Codeine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No specific action is needed; do not assume caffeine protects against opioid overdose or sedation.
What other medicines interact with Codeine?
MediHelp also lists interactions of Codeine with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Codeine page.
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