Proscar is a prescription medication that contains finasteride as its active ingredient. It is available as a 5 mg pill and is marketed primarily for the treatment of benign prostatic hyperplasia (BPH) in adult men. Finasteride belongs to the men's health therapeutic category and works by inhibiting the conversion of testosterone to dihydrotestosterone (DHT), a hormone that contributes to prostate enlargement. In Hong Kong, Proscar is regulated by the Department of Health and is dispensed only with a physician’s prescription. The product is manufactured by Merck & Co., a global pharmaceutical company.
Finasteride is a selective inhibitor of the enzyme 5α-reductase type 2. This enzyme converts testosterone into the more potent androgen DHT. By blocking this conversion, Proscar lowers DHT levels in the prostate, blood, and other tissues. Reduced DHT diminishes the hormonal stimulus that drives prostate cell growth, leading to a decrease in prostate volume over time.
Because finasteride targets a specific enzyme, it does not affect testosterone levels directly, preserving most androgen-dependent functions while addressing prostate enlargement.
Proscar is FDA- and EMA-approved (and similarly recognized by Hong Kong’s Department of Health) for the following indication:
Finasteride is not authorized for the treatment of male pattern hair loss in Hong Kong; the lower-dose 1 mg formulation (commonly sold as Propecia) is used for that purpose elsewhere.
Current peer-reviewed literature does not provide strong, guideline-supported evidence for off-label applications of the 5 mg finasteride formulation. Consequently, this article does not include off-label use sections for Proscar.
These effects are usually mild and may improve with continued therapy. If they persist beyond several weeks, patients should discuss management strategies with a healthcare professional.
Note: Patients should inform their healthcare provider of all prescription medications, over-the-counter products, supplements, and herbal remedies before starting Proscar.
Special Populations: No dosage reduction is generally required for elderly patients. In severe hepatic impairment, clinicians may consider a lower starting dose, though evidence is limited.
This article provides educational information about Proscar and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.
Proscar contains a 5 mg dose intended for benign prostatic hyperplasia, while the 1 mg formulation (often sold under a different brand name) is approved for androgenetic alopecia. The higher dose more effectively reduces prostate DHT levels, whereas the lower dose targets scalp DHT to slow hair thinning.
Yes, combination therapy is common. Finasteride addresses prostate size, while tamsulosin relaxes smooth muscle to improve urine flow. A physician should evaluate potential additive effects and monitor blood pressure.
Patients typically notice some relief within 3-6 months, with maximal benefit often occurring after 6-12 months of continuous therapy.
Most sexual side effects are reversible after discontinuation. However, a minority of men report persistent symptoms, a situation sometimes referred to as post-finasteride syndrome. Ongoing research seeks to clarify the prevalence and mechanisms.
Yes, but keep the medication in its original packaging with the prescription label visible. If traveling internationally, verify that Hong Kong’s import regulations allow personal use quantities.
Finasteride reduces PSA by roughly 50 %. Clinicians adjust PSA readings accordingly when interpreting results, ensuring that cancer screening remains reliable.
Saw-palmetto also exhibits 5α-reductase inhibitory activity. Concurrent use may increase the overall effect on DHT, potentially enhancing benefits or side effects. Discuss supplement use with a pharmacist.
Take the missed dose as soon as you remember, unless it’s close to the next scheduled dose. In that case, skip the missed pill and continue with the regular dosing schedule. Do not take two tablets at once.
Return unused or out-of-date tablets to a pharmacy’s medication-take-back program. If that option is unavailable, mix the pills with an unpalatable substance (e.g., coffee grounds) and place them in a sealed container before discarding in household trash.
