Drug interactions
Caffeine + Thioridazine
Severity: Minor
Caffeine and Thioridazine: 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 that may partly offset the sedation caused by thioridazine. Caffeine can also add to tachycardia and palpitations, which matters because thioridazine prolongs the QT interval. Clinically significant interactions are uncommon at usual dietary intakes.
What this interaction means in plain words
Caffeine and Thioridazine 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; Thioridazine belongs to Central Nervous System.
Why it happens
Opposing CNS effects through adenosine receptor antagonism by caffeine; possible additive cardiac stimulation.
What to do
No routine action is needed at moderate intake. Advise patients with palpitations or known QT risk to limit large amounts of caffeine.
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 Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine 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 Thioridazine?
MediHelp rates the interaction as minor. Caffeine and Thioridazine 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 that may partly offset the sedation caused by thioridazine. Caffeine can also add to tachycardia and palpitations, which matters because thioridazine prolongs the QT interval. Clinically significant interactions are uncommon at usual dietary intakes.
How serious is the interaction between Caffeine and Thioridazine?
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 routine action is needed at moderate intake. Advise patients with palpitations or known QT risk to limit large amounts of caffeine.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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