Finasteride vs. Minoxidil

The Two Pillars of Hair Loss Treatment

Finasteride and minoxidil are the two most well-established treatments for androgenetic alopecia, commonly known as male pattern baldness. While both are backed by decades of clinical research, they work through entirely different mechanisms and are used in different ways. Understanding how each one works can help you have a more informed conversation with your healthcare provider about which approach, or combination, may be most appropriate for you.

How Finasteride Works

Finasteride is an oral medication taken once daily. It works by blocking the enzyme 5-alpha reductase, which converts testosterone into dihydrotestosterone (DHT). DHT is the primary hormone responsible for shrinking hair follicles in men with a genetic predisposition to hair loss. By reducing DHT levels by roughly 70%, finasteride may slow or halt hair loss and, in some cases, promote regrowth. In a 2-year clinical trial published in the Journal of the American Academy of Dermatology, finasteride was shown to stop hair loss progression in approximately 83% of men and promote visible regrowth in about 66% of men.

How Minoxidil Works

Minoxidil is a topical treatment applied directly to the scalp, typically once or twice daily. It works by widening blood vessels in the scalp, which may increase blood flow and nutrient delivery to hair follicles. This can help extend the growth phase of the hair cycle and stimulate miniaturized follicles to produce thicker, more visible hair. Minoxidil does not affect DHT levels, which means it addresses hair loss through a completely different pathway than finasteride.

• •Finasteride is oral; minoxidil is topical (liquid or foam)
• •Finasteride targets DHT; minoxidil improves scalp blood flow
• •Finasteride requires a prescription; minoxidil is available over the counter
• •Finasteride is generally not recommended for women; minoxidil can be used by both men and women
• •Both require ongoing use to maintain results

Side Effects to Consider

Finasteride side effects are uncommon but may include decreased libido, difficulty with erections, or changes in mood. These effects are reported in a small percentage of users and typically resolve after discontinuation. Minoxidil side effects may include scalp irritation, dryness, or flaking, and in rare cases, unwanted facial hair growth. Some users experience temporary increased shedding when starting minoxidil, which generally subsides within a few weeks.

Can You Use Both Together?

Many dermatologists and hair loss specialists recommend using finasteride and minoxidil together for a more comprehensive approach. Because they work through different mechanisms, combining them may produce better results than either treatment alone. Several telehealth platforms now offer combination treatment plans that include both medications, sometimes along with additional ingredients like biotin or ketoconazole shampoo.