Drug interactions
Pseudoephedrine + Trifluoperazine
Severity: Moderate
Pseudoephedrine 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
Pseudoephedrine can raise heart rate and blood pressure, and trifluoperazine, a phenothiazine, can prolong the QT interval. The combination may increase the risk of ventricular arrhythmias in susceptible patients, although this is better established for thioridazine.
What this interaction means in plain words
Pseudoephedrine 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 cardiac effects of sympathomimetic stimulation and phenothiazine-associated QT prolongation; the exact mechanism is not fully defined.
What to do
Avoid pseudoephedrine in patients with QT risk factors or heart disease taking trifluoperazine. If used, monitor ECG and for palpitations or syncope.
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 Pseudoephedrine
- Isocarboxazid + Pseudoephedrine Contraindicated
- Phenelzine + Pseudoephedrine Contraindicated
- Pseudoephedrine + Rasagiline Contraindicated
- Pseudoephedrine + Selegiline Contraindicated
- Pseudoephedrine + Selegiline transdermal Contraindicated
- Pseudoephedrine + Tranylcypromine Contraindicated
Frequently asked questions
Can I take Pseudoephedrine with Trifluoperazine?
MediHelp rates the interaction as moderate. Pseudoephedrine 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. Pseudoephedrine can raise heart rate and blood pressure, and trifluoperazine, a phenothiazine, can prolong the QT interval. The combination may increase the risk of ventricular arrhythmias in susceptible patients, although this is better established for thioridazine.
How serious is the interaction between Pseudoephedrine 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: Avoid pseudoephedrine in patients with QT risk factors or heart disease taking trifluoperazine. If used, monitor ECG and for palpitations or syncope.
What other medicines interact with Pseudoephedrine?
MediHelp also lists interactions of Pseudoephedrine with, for example, Isocarboxazid, Phenelzine, Rasagiline. The full list is on the Pseudoephedrine page.
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