What this query usually means
People searching this topic are usually trying to decide whether a symptom could be treatment-related and whether the trade-off is still acceptable.
Finasteride changes DHT signaling rather than simply relaxing the bladder outlet. That difference explains why many finasteride questions are about months rather than days, prostate size rather than immediate flow, and PSA interpretation rather than only symptom scores.
What the prescribing information actually says
U.S. prescribing information for finasteride 5 mg in BPH reports erectile dysfunction, decreased libido, reduced ejaculate volume and ejaculation disorder among drug-related adverse experiences. Breast enlargement and tenderness were also reported. Post-marketing reports add other events, but post-marketing frequency cannot be estimated reliably from spontaneous reports.
Clinical interpretation should stay anchored to the reason finasteride was prescribed. A symptom, laboratory change or lack of benefit can mean different things depending on prostate size, treatment duration, adherence, other medicines and the original treatment goal.
How to turn this into a useful treatment discussion
The key decision is not “is this side effect listed?” but “how likely is finasteride to be contributing in my situation, how important is the benefit I am getting, and what reasonable alternatives exist?”
Bring the prescriber a concise timeline: when treatment started, which symptoms changed, which did not, any sexual or breast-related symptoms, recent PSA values, and whether doses were missed. That is much more actionable than a vague statement that the medicine “isn’t working.”
What the major sources support
NIDDK lists finasteride and dutasteride among 5-alpha-reductase inhibitors used for BPH because they can stop prostate growth or shrink the prostate. U.S. prescribing information documents effects on PSA and sexual adverse reactions. The AUA guideline places 5-alpha-reductase inhibitors within a broader decision framework that considers prostate enlargement, symptom burden and progression risk.
Questions to discuss with your clinician
- What was the main reason finasteride was chosen for me: prostate size, progression risk, urinary symptoms, or a combination?
- How long should we give this treatment before deciding whether the benefit is adequate?
- How should my PSA be interpreted while I am taking finasteride, and what change would trigger further evaluation?
- If side effects or persistent symptoms are a problem, which alternatives preserve the benefits I still need?
Frequently asked questions
Are sexual side effects listed for finasteride 5 mg used for BPH?
Yes. The prescribing information lists erectile dysfunction, decreased libido, reduced ejaculate volume and ejaculation disorder among drug-related adverse experiences.
Do sexual side effects always get worse the longer finasteride is taken?
The BPH prescribing information states there was no evidence of increased sexual adverse experiences with increased treatment duration in the long-term studies described, and new reports decreased with duration. Individual experience can still differ.
Should breast tenderness or enlargement be ignored?
No. Breast changes are reported with finasteride and should be discussed with a clinician, particularly if there is a lump, persistent pain or nipple discharge.
Can BPH itself contribute to sexual problems?
Yes. Age, urinary symptoms, vascular conditions, diabetes, mood and other treatments can overlap with sexual-function complaints, so causation should not be assumed from timing alone.
Should I stop finasteride if I think I have a side effect?
Do not stop a prescription medication solely on the basis of an online article. Contact the prescriber to review severity, timing, other possible causes and reasonable alternatives.
Can finasteride and tamsulosin be used together?
They can be prescribed together in selected men because they work differently. Whether combination therapy makes sense depends on prostate size, symptom burden, progression risk and tolerance.
Does finasteride shrink the prostate?
Finasteride is used in BPH partly because 5-alpha-reductase inhibition can reduce prostate growth and shrink enlarged prostate tissue over time.
Is finasteride appropriate for every man with BPH symptoms?
No. Treatment choice depends on symptom burden, prostate size, PSA, other conditions, current medicines, side-effect priorities and patient preferences.
Does finasteride treat prostate cancer?
Finasteride is not a treatment for prostate cancer. Because it changes PSA levels, prostate-cancer screening and PSA trends require appropriate clinical interpretation.
What should I tell my clinician before a PSA test?
Tell the clinician that you take finasteride, how long you have taken it and whether you have missed doses or recently stopped, because this can affect interpretation.
Can online symptom scores tell me which prescription drug to use?
No. They can help organize questions, but prescription selection requires clinical evaluation and should account for examination findings, medication history and other health factors.
When do urinary symptoms need urgent medical care?
Seek prompt care for inability to urinate, severe lower abdominal pain, fever with urinary symptoms, visible blood in urine, fainting or other severe symptoms.
Sources
Realvigor prioritizes U.S. prescribing information, public-health references and clinical guidelines. Source links open in a new tab.
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