Finasteride vs Minoxidil

Finasteride and minoxidil are the two most studied treatments for pattern hair loss, and they are the ones you will hear about most in South Africa. They are not rivals in the way the "versus" suggests. They work in completely different ways, which is exactly why a doctor will often put you on both.

The short version: finasteride goes after the hormone that shrinks your hair follicles, and minoxidil keeps the follicles you still have working for longer. One tackles the cause, the other supports the growth. Below is a plain look at each, who they suit, and how they compare.

The quick comparison

Here is how the two line up side by side. If you only read one thing on this page, read the table.

	Finasteride	Minoxidil
Form	Oral tablet, taken once daily (usually 1 mg).	Topical liquid or foam applied to the scalp. An oral low-dose version is used by some doctors off-label.
How it works	A 5-alpha-reductase inhibitor. It lowers DHT, the hormone that gradually shrinks genetically sensitive follicles in pattern hair loss.	Improves blood flow around the follicle and prolongs the active growth phase, so hairs grow thicker and stay longer before shedding.
Who it is for	Men with male pattern hair loss. Not for women who are or may become pregnant, and not standard first-line for women.	Both men and women with pattern hair loss. Women typically use a lower strength.
Evidence	Strong, long-standing evidence in men for slowing loss and helping regrowth at the crown and mid-scalp.	Well-established evidence in both men and women, most reliable for maintaining and thickening existing hair.
Possible side effects	Uncommon, but can include reduced libido or other sexual effects in a small number of men. Usually settle if the medicine is stopped, and should be discussed with a doctor.	Scalp irritation, itching or dryness. Unwanted facial hair can occur, more so with the oral form. Some early extra shedding is normal.
Needs a prescription?	Yes. Finasteride is prescription-only in South Africa.	Topical minoxidil is available in pharmacies, but is best used as part of a proper plan. Oral minoxidil is prescription-only.

How finasteride works

Most pattern hair loss is androgenetic alopecia, driven by follicles that are sensitive to a hormone called DHT (dihydrotestosterone). Over years, DHT miniaturises those follicles until the hairs they produce are too fine and short to cover the scalp. Finasteride blocks the enzyme that turns testosterone into DHT, so scalp DHT drops. With less DHT around, the shrinking slows and, for many men, some ground is regained.

Because it acts on the underlying hormonal cause, finasteride is often the backbone of a men's plan. It is a daily tablet, and like every treatment here it is maintenance-dependent. Stop taking it and DHT climbs back, and the gains fade over the following months.

How minoxidil works

Minoxidil does not touch DHT at all. It works locally at the follicle by widening blood vessels and extending the anagen (growth) phase of the hair cycle. In practice that means the hairs you have grow for longer and often come back thicker, and some dormant follicles are nudged back into growing.

Applied as a liquid or foam once or twice a day, it suits both men and women. A short burst of extra shedding in the first few weeks is common and is usually a sign the cycle is resetting, not a sign it is failing. If you stop, the follicles drift back to their previous pattern, so it is a long-term habit rather than a course.

Why they are often used together

This is the part people miss when they treat it as a straight contest. Finasteride and minoxidil hit the problem from two different angles, so combining them tends to work better than either on its own for men. Finasteride reduces the DHT that is driving the loss, while minoxidil keeps the surviving follicles active and growing. One protects, the other promotes.

A registered doctor will decide whether one or both makes sense for you, based on your pattern of loss, your health, and what you are comfortable taking. It is not a case of more is always better, but the combination is a common and sensible starting point for men.

Whichever route you take, results are slow and steady. Give any hair-loss treatment three to six months before judging it, and keep taking photos in the same light so you can see the change that a mirror hides day to day.

Men versus women: the key differences

The two medicines do not apply equally to both sexes, and this matters.

• Finasteride is used in men. It is not a standard treatment for female pattern hair loss, and it must not be used by women who are or may become pregnant, because lowering DHT can affect the development of a male foetus. Even handling crushed or broken tablets is discouraged in pregnancy.
• Minoxidil is used by both men and women, usually at a lower strength for women, and it is often the first-line topical option for female pattern hair loss.
• For some women, a doctor may consider spironolactone, a prescription medicine used off-label that reduces the effect of androgens. That is a decision made individually with a registered doctor.

If you are a woman weighing up your options, our for women page walks through what is suitable and what is not.

What if it is not pattern hair loss?

Finasteride and minoxidil are aimed at androgenetic (pattern) hair loss. Plenty of shedding has other causes, and those need a different approach rather than these medicines.

• Telogen effluvium: sudden diffuse shedding after stress, illness, childbirth or a crash diet. It often recovers once the trigger passes.
• Thyroid or iron problems: an underactive or overactive thyroid, or low iron, can thin the hair and are picked up on a blood test.
• Medication and traction: some medicines cause shedding, and tight hairstyles over time can cause traction alopecia along the hairline.

Our page on the causes of hair loss goes through these in more detail. If you are not sure which camp you are in, that is exactly what a consultation is for.

So which one should you choose?

For most men with pattern loss, the honest answer is often "both", and the real question is whether that is right for your situation. For women, minoxidil is usually where things start. Neither is a miracle, and neither is permanent unless you keep using it. What matters is matching the treatment to the actual cause, at the right strength, under proper guidance.

This page is general information reviewed by an HPCSA-registered doctor. It is not a substitute for a personal consultation. Finasteride and oral minoxidil are prescription medicines in South Africa and should only be used under a registered doctor's guidance. Do not start or stop any treatment without medical advice.