Description
Finasteride 5mg (Finast 5) for Enlarged Prostate (BPH)
If you receive a prescription for finasteride in the UK for an enlarged prostate, you may encounter various brand names. Finasteride 5mg is the active ingredient contained within this medicine. Belonging to a group of medicines known as 5-alpha-reductase inhibitors (5-ARIs), it helps manage hormone conversion in the body.
What is Finast 5?
The active ingredient within Finast 5mg is finasteride 5mg. It is bioequivalent to Proscar (Used in the UK) and follows pharmaceutical formulation standards. This medicine provides a cost-effective option for patients accessing treatment responsibly through a regulated pharmacy supply.
| Parameter | Finast 5 | Proscar (Used in UK) |
|---|---|---|
| Active Salt | Finasteride | Finasteride |
| Strength | 5mg | 5mg |
| Chemical Class | 5-alpha-reductase inhibitors (5-ARIs) | 5-alpha-reductase inhibitors (5-ARIs) |
| Bioequivalence | Bioequivalent | UK Reference Brand |
Avaialable Strengths
- Finast 1 mg
- Finast 5 mg
Mechanism of Action
Finasteride works by blocking the action of the enzyme 5-alpha-reductase, the enzyme responsible for converting testosterone into dihydrotestosterone (DHT). By reducing DHT levels in the prostate, finasteride helps shrink an enlarged prostate gland and improve urinary symptoms over time.

Note: While finasteride also affects hair follicles, male pattern hair loss is typically treated with a 1mg daily dose.
Clinical Uses
• Treatment of Benign Prostatic Hyperplasia (BPH) (enlarged prostate).
• Improvement of urinary flow and reduction of acute urinary retention risk.
(Note: 5mg tablets are formulated for BPH; 1mg tablets are standard for male pattern hair loss).
Safety Information
| Category | Details |
|---|---|
| Common Side Effects | Reduced libido, erectile dysfunction, and decreased ejaculate volume |
| Less Common but Serious Side Effects | Low mood or depression, breast tenderness or swelling, and allergic reactions |
Discontinue use and seek urgent medical advice if severe allergic reactions occur. Suspected adverse effects can be reported via the MHRA Yellow Card Scheme. Before starting or changing treatment, a doctor should always be consulted.
Finasteride Safety Warning
Patients should monitor for psychiatric side effects (including low mood and depression).
Key Interactions with Finast 5
Finast 5 (finasteride) has a low overall risk of clinical drug interactions. Your doctor or pharmacist should always be informed about all medicines and supplements you take.
- Other 5-alpha-reductase inhibitors (5-ARIs): Do not take Finast 5 with other 5-ARIs, such as dutasteride.
- Alpha-blockers: Doctors frequently prescribe alpha-blockers (medicines that relax prostate muscles) with Finast 5. This combination brings improvement to the symptoms of benign prostatic hyperplasia (BPH), a condition marked by non-cancerous enlargement of the prostate.
- St John’s Wort: This herbal remedy may lower the amount of finasteride in your body.
- CYP3A4 inhibitors and inducers: Strong CYP3A4 inhibitors (liver enzymes that metabolise drugs) like ketoconazole can slightly raise finasteride levels. Strong inducers like rifampicin may reduce its effectiveness.
- PSA Diagnostic Tests: Finast 5 lowers PSA (a protein marker for prostate cancer) levels by roughly 50%. Your doctor will account for this reduction during health screenings.
Safety Advice
Liver
Use finasteride cautiously in patients with impaired liver function because the liver metabolises this drug.
Kidney
No adjustment to dosage is needed for patients whose kidney function is reduced through renal impairment.
Alcohol
Alcohol does not directly alter finasteride efficacy, but heavy drinking may worsen side effects.
Driving
This treatment does not affect your ability to drive or operate machinery safely.
Pregnancy
Crushed or broken finasteride tablets must not be touched by women who are or may be pregnant, because the active ingredient can be absorbed through the skin, posing risks to a developing male foetus.
Breastfeeding
This treatment is not indicated for women and must not be used during breastfeeding.
Accessing Treatment Responsibly
Finast 5 is available through regulated pharmacy channels, provided a valid prescription is held. Qualified prescribers review every request carefully to ensure safe usage through mandatory prescription verification processes.
FAQ
Q: What is Finast 5mg used for?
A: Finast 5mg treats benign prostatic hyperplasia (enlarged prostate) in men. Prostate size is reduced and urinary flow improved as a result, while the risk of acute urinary retention is also lowered.
Q: How long can I take finasteride 5mg?
A: You can take finasteride 5mg long term under medical supervision. Treatment often continues for years or indefinitely. Symptoms usually return if you stop taking this medicine.
Conclusion
Finast 5 offers a competitively priced alternative containing the active ingredient finasteride, which is often prescribed for specific medical conditions. It’s important to consult your doctor or healthcare professional to ensure this treatment aligns well with your unique clinical needs and health situation.
References Sources
- NICE Guidelines: https://www.nice.org.uk/Guidance/cg97
- NHS Health A-Z: https://www.nhs.uk/medicines/finasteride/about-finasteride/
- MHRA Yellow Card Scheme: https://yellowcard.mhra.gov.uk/report-guide?reportId=927dbea2-5f6e-4a68-8dce-678ca9d7336c&category=medicine&subCategory=&product=FINASTERIDE
Medical Disclaimer
Written with the sole aim of providing information, this article does not stand in place of advice from a medical professional.






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