Finasteride for hair loss: an honest explanation
If you seriously delve into hair loss, sooner or later you will come across finasteride. It is the most commonly prescribed medication for male pattern baldness, and for many men, it makes a big difference. At the same time, there are question marks attached to it that are not always honestly answered.
This article explains how finasteride works, what you can expect from it, and when it makes sense to consider it.
What exactly is finasteride?
Finasteride is a medication developed in the 1980s for benign prostatic hyperplasia. In a lower dosage, 1 mg per day instead of 5 mg, it also proved effective for male pattern baldness. In the Netherlands, finasteride 1 mg is available by prescription, under names such as Propecia or as a generic drug.
It falls under the category of 5-alpha-reductase inhibitors: medications that block a specific enzyme in your body. That sounds technical, but the mechanism is quite clear if you know how male hair loss works.
How does it work for hair loss?
Most male hair loss, the hereditary variant, is related to DHT. This is a hormone produced from testosterone, via the enzyme 5-alpha-reductase. In men who are genetically predisposed to baldness, DHT damages the hair follicles over the years: they slowly shrink, produce increasingly thinner hair, and eventually stop.
Finasteride inhibits this enzyme. This reduces DHT levels in the blood by about 60 to 70 percent. Less DHT means less damage to the follicles, and for many men: less hair loss and in some cases partial regrowth.
So it does not act directly on the hair itself, but on the hormonal process that underlies it.
What can you expect?
Finasteride is not a miracle cure, but it is one of the most researched options available. Clinical research over several years shows:
- 80 to 90% of men: hair loss stops or slows down significantly
- 60 to 65%: some regrowth, especially on the crown
- Effect visible after 3 to 6 months, sometimes only after a year
What many people don't realize: if you stop finasteride, hair loss simply continues. It slows down the process, but does not resolve the underlying cause. Those who want to maintain the results are committed to it long-term. In practice, that means years, if not the rest of your life.
That's no reason not to consider it, but it is something to think about carefully beforehand.
The side effects everyone talks about
This is where most of the doubt lies, and rightly so. Finasteride has caused sexual side effects in some users: reduced libido, erectile dysfunction, or changes in ejaculation. In large clinical studies, this affects 1 to 3 percent of users. That is a relatively small percentage, but it is also not zero.
In most men, these symptoms disappear when they stop the medication. However, there have been documented cases where the symptoms persisted after stopping. This is known in medical literature as Post-Finasteride Syndrome, abbreviated PFS. It is rare, but it exists and has been described in peer-reviewed research.
Less discussed side effects: mild depression, fatigue, or mood swings. These are also reported, although the distinction from placebo in studies is not always clear.
What this practically means: finasteride is well tolerated by the vast majority of users, but it is a medication with real side effects in some people. That deserves an honest consideration.
Who is finasteride suitable for?
Finasteride works best in men who still have active hair follicles. This means: in early to moderate hair loss, where you see thinner hair at the hairline or crown but the follicles are not yet completely inactive.
In completely bald patches that have existed for years, the follicles are likely too far gone to respond to a DHT reduction. In that case, finasteride is of little use.
Furthermore: finasteride is not suitable for women (especially not of childbearing age due to risks to the fetus), and you need a prescription for it in the Netherlands. This can be obtained through your GP, a dermatologist, or through online healthcare platforms that offer it.
What if you don't want to use finasteride?
That is a very understandable choice. Not everyone wants to use a hormone-inhibiting medication, especially if you feel uncertain about the possible effects.
There are alternatives that are also effective, without interfering with your hormone balance. There are topical ingredients such as Redensyl, Procapil and Baicapil that have been shown to work at the follicle level, without systemic effects.
For men in the early stages of hair loss, where the follicles are still active but weakening, a combination of a good hair serum and a derma roller can already make a noticeable difference. It is not an alternative if hair loss is already advanced, but as a supplement or as a first step, it is certainly worth considering.
The Hairborn Growth Serum combines several of these active ingredients in one formula, specially developed for men with early hair loss. If you are looking for a non-hormonal approach, that is a logical place to start.
In summary
Finasteride works, that is scientifically well-substantiated. It stops or slows down hair loss in most men who use it, and some also experience regrowth. At the same time, it is a medication that you use long-term, that affects your hormone balance, and that causes side effects in some users that must be taken seriously.
Whether it is for you depends on how far your hair loss is, how you feel about medication, and whether you want to make that decision consciously and well-informed. That is a personal choice and no doctor or blog can make it for you.
Frequently Asked Questions
Can you take finasteride every other day instead of daily?
Some doctors discuss an alternative dosing schedule, but most clinical studies and standard recommendations are based on daily use of 1 mg. Do not change the intake without consulting your doctor, as a lower dosing schedule is less well-researched for effectiveness.
Is there an age limit to start finasteride?
There is no strict age limit, but finasteride is generally prescribed only to adult men, usually from the age of eighteen, when hair loss is clearly androgenetic in nature. A doctor assesses whether the medication is appropriate for each individual at that time.
Can you donate blood if you are using finasteride?
In the Netherlands, finasteride users are temporarily excluded from blood donation because the drug can be transferred through the blood and pose risks to a pregnant recipient. Consult Sanquin or your GP for the exact current guidelines on this.
Does finasteride affect fertility tests or sperm quality?
Finasteride can have a slight impact on ejaculate volume in some men, which could theoretically affect a fertility test. Consult a doctor if you are planning to conceive in the near future or need to undergo a fertility examination.
Can you combine finasteride with alcohol?
There is no known direct interaction between finasteride and alcohol, but excessive alcohol consumption can contribute to similar complaints such as reduced libido, which can make it more difficult to distinguish side effects of the medication from those of alcohol.
What happens if you forget to take finasteride for a day?
One missed day will not have a major impact, as finasteride has a gradual, cumulative effect on your DHT level. Simply take your normal dose the next day, without making up for a double amount.
Is generic finasteride as effective as the brand Propecia?
Yes, generic finasteride contains the same active ingredient in the same dosage and is subject to the same quality requirements in the Netherlands as the brand product. The difference is mainly in price and the non-active excipients, not in the effectiveness of the active ingredient itself.
Can you apply finasteride topically instead of taking it orally?
There are topical versions of finasteride that are applied directly to the scalp, with the aim of less systemic absorption and therefore potentially fewer side effects. These are less extensively studied than the oral form and not always as easily available everywhere; discuss this option with a doctor.
How long does it take for finasteride to completely wear off after stopping?
The half-life of finasteride is relatively short, usually largely out of the body within a few days, but the effect on the hair cycle and any regrowth can remain noticeable for several months before it completely fades. This varies per person.
Do you need to have blood values checked while using finasteride?
Standard blood tests are not mandatory with finasteride, but men who also have PSA levels measured for prostate screening should inform their doctor that they are using finasteride, as the drug can artificially lower the PSA value and thus give a distorted picture.
