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Minoxidil for hair growth: mechanism and results
Minoxidil is one of the most researched treatments for stimulating hair growth. Yet, there is still a lot of confusion surrounding it. What exactly is minoxidil? How does it work? And what is the difference between the lotion you apply to your scalp and the tablet you take orally? On this page, you will learn how minoxidil can stimulate hair growth, who it is suitable for, and when you can expect results. We also explain why 3CO works with oral minoxidil and what you need to know about potential side effects.
Minoxidil in brief
Minoxidil is a medication that can stimulate hair growth in cases of hereditary hair loss. It can extend the hair growth phase and help hair follicles become more active again. Minoxidil is available as a lotion or foam for the scalp and as a tablet. It does not inhibit the hormonal cause of hereditary hair loss, but it can help hair grow for longer and make thinning hair thicker.
Minoxidil was originally developed as a medication for severe high blood pressure. Doctors noticed a striking side effect: some patients experienced increased body and scalp hair growth. That discovery eventually formed the basis for using minoxidil to treat hair loss.
How does minoxidil work?
The exact mechanism by which minoxidil stimulates hair growth is not yet fully understood. It likely influences multiple processes in and around the hair follicles.
Minoxidil can, among other things:
- extend the growth phase of the hair, known as the anagen phase;
- help hair follicles transition more quickly from the resting phase to the growth phase;
- influence potassium channels in and around the hair follicle;
- stimulate growth factors such as VEGF;
- support the activity of hair follicles.
The result is that hair can continue to grow for longer, and thinning hair gradually becomes thicker and more visible.
Does minoxidil create new hair follicles?
Minoxidil does not create new hair follicles. It primarily stimulates follicles that are still present and active enough to produce hair, even if that hair is very thin and nearly invisible.
That is why it is usually more beneficial to start when hair begins to thin, but before the follicles have completely disappeared. An area that has been completely bald and smooth for a long time generally no longer responds to minoxidil or other hair loss medications. This is why it is important to take action in time.
Does minoxidil inhibit the hormone DHT?
Minoxidil does not inhibit DHT. DHT, or dihydrotestosterone, plays a major role in hereditary hair loss. In people who are sensitive to it, DHT causes hair follicles to gradually shrink. As a result, hair grows back thinner and shorter each time.
Minoxidil stimulates hair growth, but it does not directly address this hormonal cause. This is why minoxidil is sometimes combined with a DHT blocker like finasteride in men. The treatments then target different parts of the process: finasteride inhibits the influence of DHT, while minoxidil stimulates hair growth.
Read more in our article about DHT and hair loss.
Oral vs. topical minoxidil: two routes, one active ingredient
Minoxidil comes in two main forms: topical minoxidil and oral minoxidil. The active ingredient is the same, but the way the medication is used and absorbed differs.
| Characteristic | Topical minoxidil | Oral minoxidil |
|---|---|---|
| Form | Lotion, solution or foam | Tablet |
| Use | Usually once or twice a day on the scalp | Usually taken once a day |
| Absorption | Via the scalp | Via the bloodstream |
| Availability | Available without prescription | Prescription only |
| Common drawbacks | Itching, redness, flaking, greasy or stiff hair | Extra body hair |
| Key advantage | Topical application | Easy and consistent to use |
| Medical assessment | Not always required beforehand | Always required |
How do you use topical minoxidil?
Topical minoxidil is applied directly to the areas where hair is thinning. The scalp and hair must be dry when applying it. It should be applied twice a day for the best results.
In the Netherlands, topical solutions with 2% and 5% minoxidil are available over the counter. The solution must be used consistently. Irregular application reduces the chance of achieving good results.
Daily application can be quite difficult in practice. The lotion really needs to reach the scalp and not just the hair. Afterward, the product needs to dry, and some solutions can make the hair greasy, dry, or stiff. Additionally, the alcohol in certain products can cause irritation and flaking.
How do you use oral minoxidil?
Oral minoxidil is taken as a tablet. For hair loss, much lower dosages are used than for its original application for high blood pressure.
The tablet is taken once a day. The exact dosage depends on factors including gender, health, any other medication, and the doctor's assessment. The starting dose for men is typically 2.5mg and for women 1.25mg.
Oral minoxidil is available by prescription only in the Netherlands. Its use for hair loss is off-label. This means that minoxidil tablets were not originally registered for hair loss, but a doctor may prescribe them for this purpose when there is a medical justification.
Off-label does not mean the medication is prohibited or unproven. It does mean that a doctor must carefully assess whether the treatment is suitable and responsible for you.
Which version works better?
Studies that have directly compared oral and topical minoxidil show similar effectiveness on average. In a randomized study of men, oral minoxidil was not superior to topical minoxidil in all measured outcomes after 24 weeks. However, in the photographic assessment of the crown, the oral group showed visible improvement more often: 70% compared to 46% in the topical group.
A meta-analysis of comparative studies concluded that oral and topical minoxidil can provide similar improvements in hair density and hair thickness on average.
That does not mean that both forms yield the same result for everyone in practice. The treatment must be maintained consistently for years. If someone frequently forgets to apply the lotion, finds it unpleasant in their hair, or stops due to scalp irritation, the results may not materialize.
Read our comprehensive comparison of oral and topical minoxidil.
Why 3CO chooses oral minoxidil
At 3CO, we use low-dose oral minoxidil. We chose this because, for many people, a tablet is more practical and easier to stick with than a lotion that must be applied to the scalp twice a day.
A tablet:
- is taken once a day;
- does not need to be spread over the scalp;
- does not make hair greasy, dry, or stiff;
- does not cause local scalp irritation;
- reaches the hair follicles across the entire scalp via the bloodstream;
- is easier to incorporate into a daily routine.
Research shows that for many people, oral minoxidil is easier to maintain than the topical version. Users miss fewer treatment days, are less likely to stop due to application issues, and are generally more satisfied with the results.
That ease of use is important because minoxidil only works well when used consistently. In practice, oral minoxidil can therefore provide better results, especially for people who use lotion irregularly or find it unpleasant in their hair. Furthermore, studies have shown better results on the crown with oral minoxidil compared to topical minoxidil.
An international consensus of 43 experts from 12 countries now considers low-dose oral minoxidil a serious treatment option for hair loss. 3CO therefore chooses oral minoxidil for its ease of use, often better adherence, and good results.
Because oral minoxidil works through the bloodstream, a BIG-registered physician always assesses in advance whether the treatment is suitable and safe for you.
Who is minoxidil suitable for
Minoxidil is primarily used for hereditary hair loss, also known as androgenetic alopecia. This is the most common form of hair loss in both men and women.
In men, you can often recognize hereditary hair loss by:
- deepening temples;
- a receding hairline;
- thinning hair at the crown;
- a combination of hair loss at the hairline and the crown.
In women, the center part usually widens gradually and the density on top of the head decreases. The front hairline often remains largely intact.
Minoxidil may be particularly suitable when:
- your hair is gradually thinning;
- there is a family history of hair loss;
- there are still thin hairs present in the problem areas;
- you are willing to use the treatment long-term;
- you have no medical contraindications.
Minoxidil for men
For men, minoxidil can be used to stimulate hair growth and add volume to thinning hair. Because minoxidil does not inhibit DHT, a doctor may also consider a combination with finasteride for hereditary hair loss.
This combination addresses both hair growth and the hormonal cause of hair loss. The most appropriate treatment depends on your situation, preferences, and medical history.
Minoxidil for women
Minoxidil can also be used for female hereditary hair loss. For oral minoxidil, women are generally started on a lower dosage than men.
Women who are pregnant, planning to become pregnant, or breastfeeding must always mention this during the medical intake. The doctor will assess whether treatment can be started safely or should be postponed.
When might minoxidil not be suitable?
Not every form of hair loss is hereditary. Minoxidil should not be started without medical advice if:
- the hair loss started suddenly;
- you have round or sharply defined bald patches;
- your scalp is red, painful, or inflamed;
- your hair loss began shortly after childbirth or a serious illness;
- there may be an iron deficiency or thyroid issue;
- the cause of your hair loss is unclear.
Are you experiencing sudden or unusual hair loss? If so, first have the cause investigated. Also, read our article on the difference between stress-related and hereditary hair loss.
What results can you expect (and when)
Minoxidil does not work overnight. Hair grows slowly, and every hair follicle goes through a cycle of growth, transition, and rest. As a result, it usually takes several months before changes become visible.
A realistic timeline looks roughly like this:
| Period | What might you notice? | What matters? |
|---|---|---|
| Month 1–2 | No visible result yet and sometimes temporarily more shedding | Do not draw conclusions too early |
| Month 3–6 | The first visible changes may appear | Compare photos under identical conditions |
| Month 6–12 | Hair density and volume are easier to assess | Keep using the treatment consistently |
| After 12 months | The result can be properly evaluated | Discuss the next steps with the doctor |
Temporary hair loss from minoxidil
During the first few weeks, you may experience a temporary increase in hair loss. This is also known as shedding.
Minoxidil can cause hair follicles to transition from the resting phase to a new growth phase more quickly. Consequently, old hairs sometimes fall out sooner before the new hair cycle becomes visible.
Shedding does not automatically mean the treatment will work well in the end. It is also not proof that minoxidil is causing damage. It is usually a temporary reaction to the change in the hair cycle. It is important to continue using the medication consistently during this phase.
Does minoxidil work for receding hairlines and temples?
Minoxidil can also have an effect on the hairline and temples, especially when thin hairs are still present there. On average, the crown often responds better than, for example, temples that are already completely bald.
The longer an area has been completely bald, the smaller the chance of significant regrowth usually is. Maintaining and thickening existing hair is generally more realistic than fully restoring an old hairline.
What happens if you stop?
The results of minoxidil only last as long as you continue the treatment. When you stop, the stimulating effect gradually disappears.
The hairs that were maintained or improved by minoxidil may become thinner or fall out in the months after stopping. The hereditary hair loss will then continue according to its natural progression.
Minoxidil is therefore not a temporary cure, but a maintenance treatment.
Side effects and safety
Like any medication, minoxidil can cause side effects. The side effects that may occur differ between topical and oral minoxidil.
Side effects of topical minoxidil
With topical minoxidil, most side effects occur at the site where the product is applied.
Possible symptoms include:
- itching;
- redness;
- a dry or flaky scalp;
- a burning sensation;
- irritation;
- change in hair texture;
- unwanted hair growth if the liquid comes into contact with other areas of the skin.
Some of these symptoms are caused or exacerbated by alcohol or other excipients in the solution.
Side effects of oral minoxidil
The most common side effect of low-dose oral minoxidil is hypertrichosis: increased or darker hair growth on other parts of the body. This may become visible on the arms, legs, cheeks, or temples, for example.
Other possible side effects include:
- headache;
- dizziness or lightheadedness;
- palpitations or a faster heart rate;
- fluid retention;
- swollen ankles;
- swelling around the eyes;
- a drop in blood pressure.
In a large retrospective study of 1,404 users, 15.1% experienced increased body or facial hair. Dizziness was reported by 1.7%, fluid retention by 1.3%, and an increased heart rate by 0.9%. Most side effects were mild; 1.7% of participants stopped due to a side effect.
The likelihood of side effects depends on factors such as dosage and personal sensitivity. A higher dose does not automatically lead to better results, but it can increase the risk of side effects. Therefore, only use the dose prescribed by your doctor.
When should you contact a doctor?
Contact your treating physician if you experience symptoms such as persistent dizziness, heart palpitations, swelling, or fluid retention while using this medication.
Seek emergency medical attention for:
- chest pain or pressure;
- severe shortness of breath;
- fainting;
- a very fast or irregular heartbeat;
- sudden or severe fluid retention;
- a severe allergic reaction.
Because oral minoxidil can affect blood pressure, heart rate, and fluid balance, your medical status is always assessed before treatment is prescribed.
Read our full article on the side effects of minoxidil.
Buying minoxidil: drugstore, pharmacy, or via consultation
Where you can buy minoxidil depends on the version you wish to use.
Buy topical minoxidil
Topical minoxidil is available in the Netherlands as an over-the-counter product. You can generally purchase minoxidil solutions at a drugstore, online retailer, or pharmacy without needing a prescription.
Buy oral minoxidil
Oral minoxidil is not available over the counter. You can only obtain the tablets after a doctor has assessed whether the treatment is suitable and safe for you.
This is because oral minoxidil works through the bloodstream and can therefore affect not only hair follicles but also factors such as blood pressure, heart rate, and fluid balance.
At 3CO, this process is entirely online:
- You complete a medical questionnaire.
- A licensed physician reviews your request.
- The doctor checks factors including your type of hair loss, overall health, and current medication use.
- Upon medical approval, the doctor prescribes the treatment.
- The partner pharmacy prepares the medication and ships it discreetly to your home.
- Throughout your treatment, you can ask the medical team an unlimited number of questions.
Frequently asked questions about minoxidil
How long does it take for minoxidil to work?
The first visible changes usually appear after three to six months. The result can often only be properly assessed after six to twelve months. Temporary extra shedding can occur during the first weeks.
Does minoxidil promote hair growth?
Minoxidil can extend the growth phase of hairs and make existing follicles produce more actively. As a result, thinning hairs can become thicker and more visible. It does not create entirely new follicles and does not work equally well for everyone.
Does minoxidil work on receding temples?
Minoxidil can work on receding temples when active, thin hairs are still present there. An area that has been completely bald for a long time generally responds less well. Results at the crown are on average more predictable than at the hairline.
Which is better: oral or topical minoxidil?
Studies show comparable effectiveness on average. However, oral minoxidil is easier for many people to use daily and does not cause irritation or change hair texture the way a lotion can. As a result, oral minoxidil is often used more consistently and the treatment can deliver a better result in practice. On the other hand, oral minoxidil works via the bloodstream and can therefore only be used after assessment by a doctor.
Daardoor wordt orale minoxidil vaak consequenter gebruikt en kan de behandeling in de praktijk een beter resultaat opleveren. Daar staat tegenover dat orale minoxidil via de bloedbaan werkt en daarom alleen na beoordeling door een arts kan worden gebruikt.
Can women use oral minoxidil?
Yes, oral minoxidil can also be prescribed for female hereditary hair loss. Dosage and suitability are assessed by a doctor. Women who are pregnant, wish to become pregnant or are breastfeeding must always mention this during intake.
Can you combine minoxidil with finasteride?
Minoxidil and finasteride are sometimes combined for male hereditary hair loss. Minoxidil stimulates hair growth, while finasteride inhibits the formation of DHT. A doctor assesses whether the combination is suitable.
Is minoxidil safe?
Minoxidil has been used for decades. Most side effects are mild and often disappear after lowering the dose or stopping treatment. Oral minoxidil can affect blood pressure, heart rate and fluid balance. That is why a doctor always assesses before prescribing whether there are medical reasons why you cannot use it safely.
Orale minoxidil kan invloed hebben op de bloeddruk, hartslag en vochthuishouding. Daarom beoordeelt een arts vóór het voorschrijven altijd of er medische redenen zijn waardoor je het middel niet veilig kunt gebruiken.
Does your hair fall out if you stop taking minoxidil?
The effect of minoxidil only lasts as long as you continue treatment. After stopping, the effect gradually disappears and the hair you kept or regrew can fall out again over the following months. Minoxidil is therefore a maintenance treatment, not a temporary course.
Do you have to use minoxidil for life?
Minoxidil does not have to be used for life, but you do need to keep using it as long as you want to maintain the result you have achieved. If you stop, hereditary hair loss usually resumes.
Sources
- Akiska YM, Fu JM, James C, et al. Low-Dose Oral Minoxidil Initiation for Patients With Hair Loss: An International Modified Delphi Consensus Statement. JAMA Dermatology. 2025;161(1):87–95.
- Penha MA, Miot HA, Kasprzak M, Müller Ramos P. Oral Minoxidil vs Topical Minoxidil for Male Androgenetic Alopecia: A Randomized Clinical Trial. JAMA Dermatology. 2024.
- Sobral MVS et al. Efficacy and safety of oral minoxidil versus topical solution in androgenetic alopecia: a systematic review and meta-analysis of randomized clinical trials. International Journal of Dermatology. 2025.
- Liu C et al. Efficacy and safety of oral minoxidil in the treatment of alopecia: a systematic review and meta-analysis.2025.
- Vañó-Galván S et al. Safety of low-dose oral minoxidil for hair loss: a multicenter study of 1,404 patients. Journal of the American Academy of Dermatology. 2021.
- Comparing Adherence, Side Effects, and Satisfaction in Oral and Topical Minoxidil: A Cross-Sectional Study.Journal of Drugs in Dermatology. 2025;24(2):131–133.
- Pharmacotherapeutic Compass. Minoxidil, topical. Dutch National Health Care Institute.
