Finasteride vs. Minoxidil: Which Hair Loss Treatment Is Right for You?

Finasteride and minoxidil are the two most evidence-backed treatments for androgenetic alopecia (pattern hair loss), but they work through completely different mechanisms. Understanding the difference helps you and your provider build the most effective protocol.

Finasteride is an oral medication that blocks 5-alpha reductase, the enzyme that converts testosterone to DHT — the hormone responsible for shrinking hair follicles. By reducing scalp DHT levels by 60-70%, finasteride slows or stops further hair loss in approximately 80-90% of men who use it consistently.

Minoxidil is a topical solution or foam applied directly to the scalp. It works by increasing blood flow to hair follicles and extending the anagen (growth) phase of the hair cycle. It's available over-the-counter and is effective for both men and women.

The strongest evidence supports combination therapy. Finasteride prevents the underlying cause (DHT-driven miniaturization) while minoxidil stimulates active regrowth. Together, they address both sides of the equation — preservation and restoration.

Side effects differ: finasteride carries a small risk (2-4%) of sexual side effects that are typically reversible upon discontinuation. Minoxidil may cause scalp irritation or unwanted facial hair growth. Your provider will discuss the risk-benefit profile based on your specific situation.

The most important factor in hair loss treatment is timing. Both medications work best when started early — before significant follicle miniaturization becomes permanent.