Drug interactions
Caffeine + Diamorphine
Severity: Minor
Caffeine and Diamorphine: 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 CNS stimulant and may partly offset the drowsiness caused by diamorphine, which could mask early signs of opioid effect. It does not reverse respiratory depression, so the opioid risk persists despite apparent alertness.
What this interaction means in plain words
Caffeine and Diamorphine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Opposing pharmacodynamic effects on CNS arousal (adenosine receptor antagonism versus opioid-mediated sedation).
What to do
Do not rely on alertness to judge opioid safety; monitor respiratory rate and sedation scores as usual when diamorphine is dosed.
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 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 Diamorphine?
MediHelp rates the interaction as minor. Caffeine and Diamorphine 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 CNS stimulant and may partly offset the drowsiness caused by diamorphine, which could mask early signs of opioid effect. It does not reverse respiratory depression, so the opioid risk persists despite apparent alertness.
How serious is the interaction between Caffeine and Diamorphine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not rely on alertness to judge opioid safety; monitor respiratory rate and sedation scores as usual when diamorphine is dosed.
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.
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