Silodosin
Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Silodosin is an oral alpha-1A adrenergic blocker used to improve lower urinary tract symptoms from benign prostatic hyperplasia. It relaxes smooth muscle in the prostate, bladder neck, and urethra, but can cause orthostatic hypotension, dizziness, and a high rate of ejaculatory dysfunction; strong CYP3A4 inhibitors and severe renal or hepatic impairment are important safety limits.
Exploratory record, not a reviewed medical publication.
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What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Silodosin is an oral alpha-1A adrenergic blocker used to improve lower urinary tract symptoms from benign prostatic hyperplasia. NutriStack rates the supporting evidence as strong. Common adult dosing is Adults: 8 mg orally once daily with a meal. Use 4 mg once daily with a meal in moderate renal impairment; avoid in severe renal impairment., though a prescriber sets the actual dose. This profile indexes 3 sources.
The bottom line
Evidence rating strong. Most-documented uses: improved urinary flow in benign prostatic hyperplasia, reduced incomplete emptying sensation, reduced weak stream and hesitancy. 3 sources indexed (2009–2026), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Silodosin selectively antagonizes alpha-1A receptors that mediate contraction of smooth muscle in the prostate, bladder base, bladder neck, prostatic capsule, and urethra. Blocking these receptors reduces dynamic outlet obstruction and improves urine flow. The drug is metabolized by UGT2B7, alcohol and aldehyde dehydrogenases, CYP3A4, and P-glycoprotein pathways, making renal impairment and CYP3A4/P-glycoprotein interactions clinically relevant.1,2
Dosing & protocol.
Take with a meal to reduce peak-related adverse effects and maintain consistent absorption. Capsules may be opened and sprinkled on applesauce when needed according to labeling.3
Full safety detail.
Side effects
- Retrograde ejaculation or reduced semen volume
- Dizziness
- Orthostatic hypotension
- Headache
- Diarrhea
- Nasal congestion
- Syncope rarely
- Intraoperative floppy iris syndrome risk during cataract surgery
Contraindications
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Randomized controlled trials
1- 1Silodosin therapy for lower urinary tract symptoms in men with benign prostatic hyperplasiaMarks LS et al. · Journal of Urology · 2009
Clinical trials showed symptom score and urinary flow improvements, with ejaculatory dysfunction and dizziness as common adverse effects.
Reviews & position papers
1- 2Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic HyperplasiaAmerican Urological Association · AUA Guideline · 2023
Guideline supports alpha blockers for bothersome LUTS/BPH and highlights individualized adverse-effect selection.
Reference material
1- 3Silodosin Capsules US Prescribing InformationURLU.S. National Library of Medicine · DailyMed · 2026
Labeling describes 8 mg daily with meal dosing, renal dose reduction, strong CYP3A4 contraindication, orthostatic effects, and ejaculation adverse effects.
Common questions.
Quick answers about Silodosin, drawn from the data on this page.
What is Silodosin?
Silodosin is an oral alpha-1A adrenergic blocker used to improve lower urinary tract symptoms from benign prostatic hyperplasia. It relaxes smooth muscle in the prostate, bladder neck, and urethra, but can cause orthostatic hypotension, dizziness, and a high rate of ejaculatory dysfunction; strong CYP3A4 inhibitors and severe renal or hepatic impairment are important safety limits.
What is Silodosin used for?
Commonly cited benefits of Silodosin include: Improved urinary flow in benign prostatic hyperplasia; Reduced incomplete emptying sensation; Reduced weak stream and hesitancy; Reduced urinary frequency related to outlet obstruction. NutriStack rates the overall evidence as strong.
What is a typical dose of Silodosin?
A typical adult dose of Silodosin is Adults: 8 mg orally once daily with a meal. Use 4 mg once daily with a meal in moderate renal impairment; avoid in severe renal impairment.. The commonly recommended form is Oral capsule taken with the same meal each day. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Silodosin?
Reported side effects include retrograde ejaculation or reduced semen volume, dizziness, orthostatic hypotension, headache, diarrhea, nasal congestion. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Silodosin?
NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
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