Drug interactions
Propylhexedrine + Thioridazine
Severity: Moderate
Propylhexedrine and Thioridazine: 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
Propylhexedrine is a sympathomimetic decongestant that can raise heart rate and provoke arrhythmias, particularly if misused. Thioridazine markedly prolongs the QT interval, so the combination may add to the risk of ventricular arrhythmia in predisposed patients.
What this interaction means in plain words
Propylhexedrine and Thioridazine 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.
Propylhexedrine belongs to Respiratory; Thioridazine belongs to Central Nervous System.
Why it happens
Thioridazine causes QT prolongation through hERG channel blockade while sympathomimetic stimulation adds proarrhythmic and chronotropic effects; the interaction is largely pharmacodynamic and theoretical.
What to do
Avoid excessive or prolonged propylhexedrine use in patients taking thioridazine, especially those with cardiac disease, electrolyte disturbance or other QT-prolonging drugs. Check ECG and potassium if palpitations or syncope occur.
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 Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Other interactions of Propylhexedrine
- Isocarboxazid + Propylhexedrine Contraindicated
- Phenelzine + Propylhexedrine Contraindicated
- Linezolid + Propylhexedrine Major
- Propylhexedrine + Selegiline Major
- Propylhexedrine + Tranylcypromine Major
- Adrenaline-articaine + Propylhexedrine Moderate
Frequently asked questions
Can I take Propylhexedrine with Thioridazine?
MediHelp rates the interaction as moderate. Propylhexedrine and Thioridazine 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. Propylhexedrine is a sympathomimetic decongestant that can raise heart rate and provoke arrhythmias, particularly if misused. Thioridazine markedly prolongs the QT interval, so the combination may add to the risk of ventricular arrhythmia in predisposed patients.
How serious is the interaction between Propylhexedrine and Thioridazine?
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 excessive or prolonged propylhexedrine use in patients taking thioridazine, especially those with cardiac disease, electrolyte disturbance or other QT-prolonging drugs. Check ECG and potassium if palpitations or syncope occur.
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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