Drug interactions
Chlorpheniramine + Trifluoperazine
Severity: Moderate
Chlorpheniramine and Trifluoperazine: moderate 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
Both agents cause sedation, and trifluoperazine adds antipsychotic-related effects. The combination may increase drowsiness and anticholinergic effects such as dry mouth, constipation and urinary retention.
What this interaction means in plain words
Chlorpheniramine and Trifluoperazine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive CNS depression and anticholinergic activity from H1 blockade and phenothiazine receptor antagonism.
What to do
Monitor for oversedation and anticholinergic effects, reducing doses if they occur. Counsel about driving and machinery.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Chlorpheniramine
Frequently asked questions
Can I take Chlorpheniramine with Trifluoperazine?
MediHelp rates the interaction as moderate. Chlorpheniramine and Trifluoperazine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both agents cause sedation, and trifluoperazine adds antipsychotic-related effects. The combination may increase drowsiness and anticholinergic effects such as dry mouth, constipation and urinary retention.
How serious is the interaction between Chlorpheniramine and Trifluoperazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for oversedation and anticholinergic effects, reducing doses if they occur. Counsel about driving and machinery.
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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