Drug interactions
Caffeine + Chlorpheniramine
Severity: Minor
Caffeine and Chlorpheniramine: 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 may partly offset the drowsiness caused by chlorpheniramine, but it does not reliably restore psychomotor performance. The effect is of little clinical concern.
What this interaction means in plain words
Caffeine and Chlorpheniramine 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; Chlorpheniramine belongs to Respiratory.
Why it happens
Caffeine's CNS stimulation via adenosine receptor antagonism opposes antihistamine-induced sedation.
What to do
No action is needed beyond counselling that caffeine should not be relied on to prevent sedation when driving.
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 Chlorpheniramine
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 Chlorpheniramine?
MediHelp rates the interaction as minor. Caffeine and Chlorpheniramine 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 may partly offset the drowsiness caused by chlorpheniramine, but it does not reliably restore psychomotor performance. The effect is of little clinical concern.
How serious is the interaction between Caffeine and Chlorpheniramine?
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 action is needed beyond counselling that caffeine should not be relied on to prevent sedation when driving.
What other medicines interact with Chlorpheniramine?
MediHelp also lists interactions of Chlorpheniramine with, for example, Belladonna and opium, Benzhydrocodone / acetaminophen, Brexanolone. The full list is on the Chlorpheniramine page.
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