Drug interactions
Phenylephrine po + Silodosin
Severity: Minor
Phenylephrine po and Silodosin: 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
Oral phenylephrine is an alpha-1 agonist used as a decongestant and may in theory counteract the effect of silodosin on prostatic and bladder neck smooth muscle. It may also raise blood pressure, opposing the alpha-blocker's vascular effect. Clinical significance at usual oral doses is likely small.
What this interaction means in plain words
Phenylephrine po and Silodosin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Pharmacodynamic antagonism at alpha-1 adrenergic receptors.
What to do
Monitor urinary symptoms and blood pressure if a decongestant is used; consider a non-adrenergic alternative if symptoms worsen.
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 Silodosin
- Atazanavir + Silodosin Contraindicated
- Conivaptan + Silodosin Contraindicated
- Darunavir + Silodosin Contraindicated
- Fosamprenavir + Silodosin Contraindicated
- Indinavir + Silodosin Contraindicated
- Itraconazole + Silodosin Contraindicated
Frequently asked questions
Can I take Phenylephrine po with Silodosin?
MediHelp rates the interaction as minor. Phenylephrine po and Silodosin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Oral phenylephrine is an alpha-1 agonist used as a decongestant and may in theory counteract the effect of silodosin on prostatic and bladder neck smooth muscle. It may also raise blood pressure, opposing the alpha-blocker's vascular effect. Clinical significance at usual oral doses is likely small.
How serious is the interaction between Phenylephrine po and Silodosin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor urinary symptoms and blood pressure if a decongestant is used; consider a non-adrenergic alternative if symptoms worsen.
What other medicines interact with Silodosin?
MediHelp also lists interactions of Silodosin with, for example, Atazanavir, Conivaptan, Darunavir. The full list is on the Silodosin page.
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