Drug interactions
Caffeine + Perphenazine
Severity: Minor
Caffeine and Perphenazine: 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 offset some of perphenazine's sedation, while high caffeine intake may worsen anxiety, tremor or insomnia in treated patients. Caffeine may also reduce phenothiazine absorption by forming precipitates in the gut, but the clinical significance is unclear.
What this interaction means in plain words
Caffeine and Perphenazine 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; Perphenazine belongs to Central Nervous System.
Why it happens
Opposing CNS effects; possible reduced absorption through complex formation, which is not well established.
What to do
Advise patients to keep caffeine intake moderate and consistent. Reassess symptom control if intake changes substantially.
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 Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine 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 Perphenazine?
MediHelp rates the interaction as minor. Caffeine and Perphenazine 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 offset some of perphenazine's sedation, while high caffeine intake may worsen anxiety, tremor or insomnia in treated patients. Caffeine may also reduce phenothiazine absorption by forming precipitates in the gut, but the clinical significance is unclear.
How serious is the interaction between Caffeine and Perphenazine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise patients to keep caffeine intake moderate and consistent. Reassess symptom control if intake changes substantially.
What other medicines interact with Perphenazine?
MediHelp also lists interactions of Perphenazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Perphenazine page.
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