Drug interactions
Pseudoephedrine + Tamsulosin
Severity: Moderate
Pseudoephedrine and Tamsulosin: 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's adrenergic activity opposes alpha-1 blockade by tamsulosin, and may blunt its urinary benefit. Pseudoephedrine may also provoke urinary retention in men with BPH.
What this interaction means in plain words
Pseudoephedrine and Tamsulosin 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 belongs to Respiratory; Tamsulosin belongs to Genitourinary.
Why it happens
Pharmacodynamic antagonism between sympathomimetic alpha-agonism and alpha-1 receptor blockade.
What to do
Avoid oral decongestants in men with BPH where possible; monitor urinary symptoms and blood pressure if used.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Pseudoephedrine and Tamsulosin, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Pseudoephedrine
- Isocarboxazid + Pseudoephedrine Contraindicated
- Phenelzine + Pseudoephedrine Contraindicated
- Pseudoephedrine + Rasagiline Contraindicated
- Pseudoephedrine + Selegiline Contraindicated
- Pseudoephedrine + Selegiline transdermal Contraindicated
- Pseudoephedrine + Tranylcypromine Contraindicated
Other interactions of Tamsulosin
- Alfuzosin + Tamsulosin Major
- Avanafil + Tamsulosin Major
- Ceritinib + Tamsulosin Major
- Clarithromycin + Tamsulosin Major
- Cobicistat + Tamsulosin Major
- Doxazosin + Tamsulosin Major
Frequently asked questions
Can I take Pseudoephedrine with Tamsulosin?
MediHelp rates the interaction as moderate. Pseudoephedrine and Tamsulosin 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's adrenergic activity opposes alpha-1 blockade by tamsulosin, and may blunt its urinary benefit. Pseudoephedrine may also provoke urinary retention in men with BPH.
How serious is the interaction between Pseudoephedrine and Tamsulosin?
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 oral decongestants in men with BPH where possible; monitor urinary symptoms and blood pressure if used.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
