Finasteride works by blocking 5-alpha-reductase, the enzyme that converts testosterone into DHT (dihydrotestosterone). In genetically susceptible hair follicles, DHT can gradually shorten the hair-growth cycle and cause follicles to become smaller over time.

By lowering DHT, finasteride can help slow ongoing hair loss, protect existing follicles, and create a better environment for maintaining hair density. Some patients may also experience visible improvement in thickness or regrowth with continued treatment.

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Finasteride works gradually, so consistency matters more than expecting an immediate change.

With regular use, patients may notice:

• Less shedding over time
• Slower progression of thinning
• Better preservation of existing hair
• Improved-looking density in some areas
• Thicker or fuller-looking hair with continued treatment

Hair-growth cycles take time, and noticeable changes are often evaluated over several months. Continued use is generally needed to maintain the benefits.

Before starting finasteride, your medical prescriber will review your hair-loss pattern, medical history, current medications, previous treatments, and treatment goals to determine whether it’s appropriate for you.

Let your provider know about any prostate conditions, liver concerns, hormone-related conditions, fertility concerns, or medications and supplements you currently use. Finasteride can affect PSA levels, so tell any healthcare professional ordering prostate-related bloodwork that you are taking it.

Women who are pregnant or may become pregnant should not handle damaged or opened finasteride capsules because of potential risk to a developing male fetus.

Your provider can also discuss possible side effects, including changes in libido, erectile or ejaculatory function, breast tenderness, or mood, and help determine whether treatment should be adjusted if needed.

Prescription required.