Oral DHT blockers: finasteride and dutasteride.
Two prescription drugs that lower DHT, one of the main hormonal drivers of hair loss. I go through how they work, what their side effects are, what the evidence says about natural DHT blockers and the experimental RU58841, and where microneedling fits into this. I'm not a doctor, I can't prescribe anything, make the decision together with your treating physician.
What is DHT, and why does it matter for hair?
DHT (dihydrotestosterone) is a potent androgen hormone. It's made from testosterone by the 5-alpha reductase enzyme. DHT is the main driver of androgenetic (hereditary) hair loss: in genetically sensitive scalp follicles it binds the androgen receptor and shortens the hair's growth (anagen) phase.
Because of this, the follicles gradually miniaturize: the thick, terminal hair strand turns into a thinner, shorter vellus hair, until it barely grows out at all. This gradual process explains why hair thins slowly, over years. The logic behind DHT blockers is simple: if less DHT is produced, this miniaturizing pressure is smaller.
This is what the same follicle looks like as it produces smaller and smaller hair under DHT pressure:
DHT doesn't eliminate the follicle in one stroke, it shrinks it a little more with every cycle. The evidence here is about the mechanism itself, not about any specific product.
Why specifically on the crown and the temples?
DHT is present everywhere in the bloodstream, yet hair thins in a pattern. The difference isn't in the hormone level, it's in the follicles: the literature describes androgenetic hair loss as a hereditary predisposition and an increased androgen sensitivity of the follicles.JAAD Int. 2023
The follicles at the back of the head and on the sides are less sensitive to DHT. The androgen receptor gene in these follicles is methylated, meaning quieter, and this protects them from miniaturization.JAAD Int. 2023 This is why the horseshoe of hair remains even when the crown is already thin, and this is why hair can be transplanted from there: the transplanted follicles don't miniaturize in their new location either.
Inside the follicle, DHT binding to the androgen receptor triggers a signaling cascade. The end result of this is the follicle shrinking and the growth (anagen) phase shortening: the strands get thinner and shorter with every cycle, until eventually some no longer grow out to the skin's surface at all.JAAD Int. 2023 This is why a thinning crown looks as if there are fewer hairs on it. Most of the follicles are still there, the strands have just become fuzz-thin. As long as that's the case, there's something to work with. Where the scalp is already shiny and smooth, the follicle is gone, and no treatment brings that back.
Measuring your DHT level won't tell you what will happen to your hair
A common question is whether it's worth having your DHT level measured. In patterned hair loss, the difference lies in the follicles' sensitivity, and that can't be measured from blood. A DHT value on its own therefore doesn't tell you whether you'll go bald, nor whether a treatment will work for you. The pattern and the thickness of the strands reveal more than the lab.
A blood test is useful when the hair loss came on suddenly, is diffuse, and has no pattern. In that case we look for other causes, for example ferritin, which reflects iron stores, and the thyroid.
One thing is worth clarifying: DHT isn't a deposit on the hair strands. It's produced in the body and acts inside the follicle. A shampoo sits on your scalp for a few minutes, then you rinse it off. An active ingredient applied to the scalp can still do something locally, but a shampoo doesn't lower the body's DHT level.
Finasteride
Finasteride primarily inhibits type 2 5-alpha reductase, so less testosterone converts into DHT. Less DHT on the scalp means the miniaturizing pressure eases. In men, it's approved (officially authorized) for male pattern hair loss, as a daily tablet, by medical prescription.
Important: it doesn't work the same for everyone, and the effect lasts only while you keep taking it. If someone stops, DHT returns to its previous level, and the hair loss typically continues from where it would have been anyway. No one can promise a result, it's individual, and it requires medical judgment.
Dutasteride
Dutasteride inhibits both type 1 and type 2 5-alpha reductase at once, so it lowers DHT more strongly than finasteride. For hair loss it's generally used off-label (not an approved indication), also by prescription.
The stronger DHT suppression could in theory produce a bigger effect, but the side-effect profile points in a similar direction, and the drug stays in the body longer. Which one is the right choice isn't something to decide on your own, it's a question to work out with your doctor.
This is the size of the difference in concrete numbers. Measured in the same study, where 5 mg finasteride daily lowered serum DHT by 70.8 percent, 0.5 mg dutasteride daily lowered it by 94.7 percent Clark 2004. In healthy men, measured over one year, the same comparison is 73 and 94 percent Amory 2007.
The finasteride bars come from a single dose-ranging study, on 249 men with hair loss Drake 1999; the dutasteride bar comes from a different study, on patients treated for prostate enlargement Clark 2004. The two figures therefore weren't produced in the same measurement, but the order is also confirmed by the head-to-head data above.
The reason for the difference is the enzyme's two types. According to the officially approved drug information, type 2 accounts for roughly two-thirds of circulating DHT, and type 1 for the rest PROPECIA drug information. Finasteride inhibits type 2 roughly a hundred times more strongly than type 1, so the DHT produced by type 1 mostly stays in place. Dutasteride inhibits both, which is why it reaches higher.
Side effects
Both drugs lower DHT throughout the whole body, not just on the scalp. Because of this, sexual side effects are possible: reduced libido, erectile dysfunction, changes in ejaculation. Less often, breast tenderness or enlargement (gynecomastia) and mood effects (low mood, anxiety) can also occur.
One thing needs to be taken seriously: drug authorities specifically highlight that low mood, depression, and even suicidal thoughts can occur with oral finasteride, and because of this a patient card is now included in the box. The official recommendation is clear: if you experience this, stop taking it and see a doctor.
For most people the physical complaints are mild and resolve once the drug is stopped. It's good to know this in advance, and to discuss it with your doctor before starting.
There's a disputed phenomenon called post-finasteride syndrome: in some people, sexual, mood, or cognitive complaints persist even after stopping the drug. Its status is disputed. Part of the scientific literature points to methodological weaknesses in the studies (missing control group, nocebo effect, retrospective questionnaires). At the same time, several drug authorities, including the US FDA, have required that the possibility of persistent side effects appear in the finasteride patient information leaflet. There is currently no proven, established treatment for it. This is exactly the kind of information you need to know, and weigh with your doctor before deciding.
What do people who take it write?
In numbers: in the registration trial, some kind of sexual side effect occurred in the first year in 3.8 percent of the 945 men taking finasteride, versus 2.1 percent of the 934 men on placebo PROPECIA drug information. Without the placebo arm this figure would be misleading, the excess attributable to the drug is roughly 1.7 percentage points.
Three more things belong to this picture. Because of any adverse event, 2.1 percent of those on placebo stopped taking it, versus 1.7 percent of those on finasteride Propecia SmPC; specifically because of sexual complaints, in the first year it was about 1 percent on both arms. And the frequency of sexual complaints doesn't stay at this level: in those taking finasteride it fell to 0.6 percent over the following four years Propecia SmPC. Depression entered the list from post-marketing surveillance: in the randomized phase-III trials its occurrence didn't differ from placebo Propecia SmPC.
Alongside the official list, there's also what the people taking it write themselves. The symptoms below come from public posts on English-language hair-loss forums. These are forum accounts: there's no measurement behind them, they say nothing about frequency, and on their own they don't prove the drug caused them. They're biased in two directions. Someone who's doing fine rarely starts a thread saying nothing happened, so complaints are overrepresented; at the same time, people who complain are often shouted down on hair-loss forums, which pulls in the other direction.
These also appear in the official drug information, with the forum term in parentheses, because these are typically the phrases that come up in a search:
- reduced libido (low libido), weaker erections (weaker erections, ED)
- thin, watery semen (watery semen). The patient information lists this as poor semen quality, the forum term is more vivid
- testicular pain (ball ache)
- nipple tenderness, breast tissue growth (gyno)
- low mood, depression, suicidal thoughts NNGYK/EMA, 2025
- anxiety (anxiety). The 1 mg product's summary of product characteristics lists this as a side effect of unknown frequency Propecia SmPC
- blunted orgasm (orgasm disorders). The US drug information lists this among disorders that can persist after stopping the drug PROPECIA drug information
- itching, skin rash, hives. The patient information lists these as hypersensitivity reactions, not as a scalp complaint Hungarian patient information
- sexual dysfunction that continues even after stopping the drug
These are described on the forums, but I couldn't find them in the official drug information I reviewed, so for now they're anecdotal:
- absent morning erections (no morning wood). The official list includes erectile dysfunction, this specific name is the forums' own
- brain fog, difficulty concentrating (brain fog)
- difficulty falling asleep, sleep disturbance (insomnia)
- panic attacks (panic attack)
- emotional numbness, inability to feel pleasure (anhedonia)
- genital numbness (genital numbness)
- fatigue, stalled muscle building, weight gain
- oily scalp
Many of the accounts of persistent complaints come from a separate community, r/FinasterideSyndrome. That's where people go whose symptoms have persisted, so nothing can be inferred from the proportions there about people who take the drug as a whole.
The other side appears just as often: many write that they had no side effects at all, or that they went away after a few weeks. Four kinds of outcome run through the threads. Some people have nothing the whole time. Some experience something in the first weeks, which then gradually settles with continued use. Some resolve it after stopping the drug. And some still have it years later. How common each of these is can't be answered from the forums.
One phenomenon deserves separate mention, because many people stop because of it: the initial increased shedding (dread shed). According to the accounts it typically starts in the first weeks, and its length varies widely, some write about a few weeks, some about months. The explanation circulating on the forums is that this is a sign the drug is working. This is a belief of the community, there's no measured link behind it, and the patient information doesn't claim it either.
These are prescription drugs. I don't prescribe anything, and I don't replace a doctor. Weighing the benefit against the risk, the dosage, and the monitoring is a matter for your treating physician, especially if you have a chronic condition, take other medication, or are planning to have a child. The goal is for you and your doctor to be able to decide with all the facts in hand.
What if you miss a dose or a week?
Finasteride leaves the blood quickly: its half-life is roughly 5-6 hours in men aged 18 to 60, about 8 hours over 70 PROPECIA drug information. Its effect, though, lasts much longer than that, because finasteride forms a durable complex with the 5-alpha reductase enzyme itself. The same patient information puts the laboratory half-life of the type 2 enzyme complex at roughly 30 days, and the type 1 complex at 14 days. This is a lab value measured on the enzyme, and it doesn't mean a single tablet works for a month.
Measured in humans, the picture is the following. A single dose keeps the serum DHT level suppressed for up to four days, longer than what you'd expect from its blood level alone Steiner 1996. This data comes from a prostate-focused review, which doesn't specify which dose it refers to, so it isn't separately confirmed for the 1 mg used for hair. And for someone who stops completely, serum DHT returns to baseline in roughly two weeks finasteride 5 mg patient information. This measurement was made after 14 days of use, with the 5 mg product.
Dutasteride is more forgiving in this respect. Its half-life is roughly 5 weeks, and it remains detectable in the blood for 4-6 months after stopping AVODART patient information. The patient information talks about the level of the active substance, it doesn't state how long the DHT reduction itself lasts.
What follows from this is that a missed day barely moves DHT. Over a missed week, DHT already creeps back up meaningfully, but hair runs on a much slower clock: according to the Hungarian patient information, the full effect can take up to 3-6 months to develop, and after stopping, hair grown as a result of treatment likely sheds within 9-12 months Hungarian patient information. An occasional week probably doesn't show up on this timescale. This is a conclusion derived from pharmacokinetics, there's no measurement behind it: I couldn't find a study that measured, in men, how much missed doses worsen the hair outcome. So for missed doses becoming a regular pattern, no figure can be given at all.
What the patient information states: skip the forgotten dose, and take the next one as usual. Don't take a double dose to make up for it Hungarian patient information. If the missed doses become regular, or you want to stop, it's worth discussing with the doctor who prescribed it.
If you're afraid of the side effects: the steps before hormonal medication
On our hair-loss forum (r/hajnovesztes), most finasteride questions are about getting a prescription and where to buy it, but a separate, recurring topic is fear of the side effects, typically in the form of "can they be permanent". These are forum accounts, they say nothing about frequency; the rates are given by the numbers above. The decision, however, isn't a two-way switch: before hormonal medication there are steps that don't work through the hormone system.
Topical minoxidil is not a drug that works through the hormone system: it's a potassium-channel-opening vasodilator StatPearls, Minoxidil, not a 5-alpha-reductase inhibitor, so the hormonal side-effect profile described for finasteride doesn't carry over to it. I wrote up the full picture (where to buy, prices, side effects) in the minoxidil article.
Microneedling works mechanically on the follicle's environment, independently of hormones. The honest picture: the evidence is thinner and mixed, most of it was measured in combination with minoxidil, there's less data on its standalone role, and the studies were done with clinical devices, not with the at-home 1 mm stamp. There's a separate chapter on microneedling below; the sourced details are in the 1 mm Dermastamp guide.
What time does in the meantime: pattern hair loss is a progressive process, and miniaturization takes the follicles further down with each cycle. If you're still thinking about the medication route, the time in between isn't neutral. A non-hormonal start is there so you don't stand still in the meantime, with the knowledge that these don't slow the androgen cause: that's what the drugs above are for, with the evidence walked through in this article. The two don't rule each other out, and you choose the order.
Natural DHT blockers: what does the evidence say about them?
Many people look for a natural, prescription-free way to lower DHT. It's worth stating upfront what the evidence currently shows: for these substances there are typically only small, weak, or lab-only studies available, and none of them compares to the evidence base behind finasteride or dutasteride. An effect is possible, but it isn't proven at the same level as the drugs.
Five substances come up most often: saw palmetto, pumpkin seed oil, rosemary oil, green tea (EGCG), and caffeine. Their studies are small, partly open-label, and for some of them there's only lab data. Where they were compared directly with finasteride, finasteride performed better.
If this path interests you, the breakdown by substance, the size of the studies, and the placebo question are here: natural DHT blockers, and what the evidence says about them. There you'll also read about DHT-blocking shampoos and ketoconazole.
RU58841: the experimental topical agent
RU58841 is an experimental anti-androgen applied topically (to the scalp). It works through a different route than finasteride: instead of lowering the whole body's DHT level, it tries to prevent DHT from binding the androgen receptor locally, at the follicle.
Something that needs to be stated plainly: RU58841 has never been approved anywhere in the world, no drug authority has authorized it for any use. Its development was stopped at an early stage, and the results of the early human trials were never published. What's publicly available is animal and laboratory data. There is essentially no human, long-term safety or efficacy data on it.
Today it's sold as a research chemical, without controlled pharmaceutical quality, meaning the purity, concentration, and contamination are all uncertain. It's a popular home remedy on hair-loss forums, but the striking results circulating on forums have no published source. This is an experimental substance, and using it is your own responsibility.
An unapproved experimental substance, without published human safety data. I can't and don't want to recommend or dose something like this. If someone is considering it anyway, they should absolutely discuss it with a doctor, because its long-term risks in humans are unknown, and the quality of the research chemical isn't verified either.
Where does microneedling fit in?
Microneedling works through an entirely different route than DHT blockers. It doesn't touch hormones: the needle delivers a tiny, controlled micro-stimulus to the skin and activates the environment around the follicle (blood flow, growth factors). A DHT blocker lowers the hormonal cause from the inside, microneedling stimulates the follicle's environment mechanically from the outside. Two different points of attack, which is why they can complement each other, but microneedling doesn't replace the drug.
The needle works in the upper layer of the skin, and stimulates the environment around the follicle. It doesn't lower DHT, it tries to help from a different angle, through the follicle's environment. That's why the two can be complements to each other, not substitutes.
More details
For hair, the strongest data is specifically about using microneedling and topical minoxidil together, from a study done with a clinical device. No separate study has been done with our home device, we're citing the mechanism, not our own device. Whatever you do on the hormonal side, discuss it with your doctor.
More on microneedling and the differences between devices: dermastamp vs dermaroller. The full list of risks and contraindications: risks and things to know.
If you're curious about your own pattern, I've written separate pages about that: male pattern hair loss, female hair loss, and the pattern picker, if you don't yet know which one is yours.
Where and from whom can you get it in Hungary?
Both are prescription-only. It matters a lot which product we're talking about, though, because their indication (what the authority approved them for) is different.
| Product | What it's approved for in Hungary | Prescription |
|---|---|---|
| FYNZUR 2.275 mg/ml external spray (topical finasteride) | hair loss (OGYI-T-24394, approved 2024.05.30) | yes |
| Finasteride 5 mg tablet | benign prostate enlargement | yes |
| Dutasteride | benign prostate enlargement. In Hungary it has no approved indication for hair loss. | yes |
Prescribing 5 mg finasteride and dutasteride for hair loss is therefore off-label: not prohibited, but it has its own rules. An open question I won't hide: the 1 mg oral finasteride approved for hair loss doesn't appear in the 2025 drug-safety letter's Hungarian distributor table, only the 5 mg versions and the FYNZUR spray do NNGYK/EMA, 2025.09.03. Whether it's actually on the market right now is worth checking at the pharmacy or in the official database. I'm not claiming it isn't available, nor that it is.
The most common complaint is that people can't find a doctor willing to prescribe it. The answers contradict each other because two separate questions get mixed together.
According to the relevant regulation, a doctor may prescribe a drug authorized for marketing 44/2004 ESzCsM regulation, and I couldn't find a rule that ties hair-loss drugs to a single specialty. The limit: the same section separately states that off-label prescribing is subject to its own procedure (448/2017 Government regulation). In practice, the dermatologist is the natural address: the authority also gave dermatologists a simplified procedure for oral minoxidil NNGYK, 2025.11.12.
Based on the price lists published by three Hungarian private practices in July 2026, a first dermatology consultation runs roughly between 25 000 and 35 000 forints public price lists, 2026.07. This is the fee for the examination and consultation, not for treatment, and prices change, so check the practice's own site when you get started.
What it comes down to, based on forum experience: look for a practice whose profile mentions androgenetic alopecia, and when booking say that's why you're coming. Bring photos of your crown and a recent blood test, if you have one.
A recent safety measure you should know about. In September 2025, the products' marketing authorization holders, in agreement with the European (EMA) and Hungarian (NNGYK) drug authorities, issued a direct healthcare professional communication NNGYK/EMA, 2025.09.03:
"Suicidal ideation is a side effect linked to oral finasteride-containing products, reported mainly in patients treated for androgenetic alopecia."
"Inform patients treated with oral finasteride for androgenetic alopecia to stop treatment and see a doctor if they experience low mood, depression, or suicidal thoughts."
Because of this, a patient card is now included in the box of 1 mg finasteride, drawing attention to this and to the risk of sexual dysfunction.
In the European adverse-event database, 325 relevant cases were identified: 313 for finasteride (with roughly 270 million patient-years of exposure) and 13 for dutasteride (with roughly 82 million patient-years); in one case both were reported, so the total isn't 326. On frequency, the authority states that "based on the available data, the frequency cannot be established". For scalp-sprayed (topical) finasteride, the authority separately notes that "there is currently insufficient evidence" to confirm the causal relationship. A tablet from a foreign webshop, on the other hand, comes with no patient card and no information. You can also report a side effect yourself.
In women, finasteride is a separate case. According to the approved patient information, the product is specifically intended for men, in women with hair loss the studies show it isn't effective, and it's prohibited in women who are pregnant or could become pregnant because of the risk to a male fetus. They shouldn't even come into contact with a broken or crushed tablet finasteride patient information.
And webshops, settled in short order. Under Hungarian rules, only products that are "dispensable without a prescription and not covered by public funding" can be ordered online 44/2004 ESzCsM regulation, and finasteride and dutasteride are prescription-only. In other words, whoever makes these orderable online for delivery to Hungary is, by definition, not operating as a legal Hungarian pharmacy.
Don't order a prescription-only hair-loss drug from a webshop offering it without a prescription. Outside the legal chain there's no pharmacist review, no approved patient information leaflet in Hungarian, no patient card, and if the product is recalled, you won't hear about it. The prescription is the one point where someone checks whether this drug is right for you.
Frequently asked questions
How long before something shows?
Everything about hair is slow: results are measured in months, and it requires patience, because new hair builds up slowly. In the first weeks it's more realistic to see the hair loss slow down, not dramatic thickening. Your doctor can give you a realistic sense of how much time and effect is realistic for you.
Does it grow hair back, or does it just slow the loss?
Realistically, slowing the hair loss is the more expected outcome, and for some people partial thickening is also possible, typically on the crown. No one can promise full regrowth, it's individual. The emphasis is generally on keeping the hair you still have, not on bringing back follicles lost long ago.
Does it only work on the crown, or on the hairline too?
In the studies, the most noticeable change typically shows up on the crown (the vertex area), on a receding temple hairline the effect tends to be more modest. This varies from person to person, and your doctor can give you a realistic picture.
Do you have to take it forever?
The effect lasts only while you keep taking it. If you stop, DHT returns to its previous level, and the hair loss typically continues from where it would have been anyway. So this is a long-term treatment, but how long and how is an individual, medical decision.
What if I miss one or two doses?
A missed dose matters less than you'd think. Finasteride stays in the blood only briefly, but a single dose keeps DHT suppressed for up to four days, because it forms a durable complex with the enzyme Steiner 1996. This data comes from a prostate-focused review, it isn't separately confirmed for the 1 mg dose used for hair. Dutasteride's half-life is roughly 5 weeks AVODART patient information, and from this long half-life it follows that for dutasteride a missed day moves the needle even less. The patient information doesn't state the duration of the DHT reduction itself. What to do, per the patient information: skip the forgotten dose, take the next one as usual, and don't take a double dose to make up for it Hungarian patient information. In detail, including a missed week: what if you miss a dose or a week.
Can you get it without a prescription?
No. Both finasteride and dutasteride are prescription-only, prescribed by a doctor, and available at a pharmacy with a prescription. There's no legal, prescription-free equivalent of the same strength. Substances offered without a prescription are risky, their origin and quality are uncertain. If this path interests you, it's worth turning to a doctor first.
For exactly what's available in Hungary, who can prescribe it, and what the situation is with a foreign online prescription: see the "Where and from whom can you get it in Hungary" section above.
Is it the same finasteride for hair and for the prostate?
The active substance is the same, but for hair loss a tablet with a much lower active-substance content is prescribed than for benign prostate enlargement, where several times that amount is standard. So it does matter which product it is. Your doctor decides what and how much is right for you.
Are libido and erection complaints reversible?
For most people, sexual side effects resolve once the drug is stopped, but for some it takes longer for them to settle. The rare, persistent complaints are linked to the disputed post-finasteride syndrome. If you experience this, don't stop it on your own, talk to your doctor.
Does it affect fertility or sperm?
In some people finasteride can temporarily worsen sperm quality, which typically improves after stopping the drug. If you're planning to have a child, this is an important factor, definitely discuss it with your doctor, who can recommend testing if needed.
Can it cause depression or mood changes?
Yes, this is possible. Drug authorities have confirmed that low mood, depression, and even suicidal thoughts can occur with oral finasteride, which is why a patient information card about this is now included in the box. The official recommendation: if you experience this, stop taking it and see a doctor as soon as possible. If it feels urgent, don't wait for your next appointment.
How real is post-finasteride syndrome?
Honestly: disputed. There are people who report persistent sexual, mood, or cognitive complaints even after stopping the drug, while part of the research points to methodological weaknesses and the nocebo effect. There's no proven treatment for it, but the authorities have required that the possibility be included in the patient information. It's not something to hide, it's something to know about.
Dutasteride or finasteride, which is stronger?
Dutasteride inhibits both enzyme types, so it lowers DHT more strongly. In theory this could give a bigger effect, but the side effects point in a similar direction, and the drug stays in the body longer. Finasteride is the one with an approved indication for hair loss. Your doctor can weigh which one is right for you.
If I take more finasteride, will it become as strong as dutasteride?
No. Finasteride's DHT reduction reaches its ceiling already at a very low dose. In a dose-ranging study on 249 men with hair loss, serum DHT fell by 68.6 percent at 0.2 mg, 71.4 percent at 1 mg, and 72.2 percent at 5 mg, meaning the five-fold dose gave only 0.8 percentage points more. The authors themselves wrote that already 0.2 mg daily maximally lowered both scalp and serum DHT levels Drake 1999. Measured in the scalp, the difference was larger (56.5 percent at 0.2 mg, 64.1 percent at 1 mg, 69.4 percent at 5 mg), but the scalp values didn't follow the dose monotonically: 0.05 mg came out at 61.6 percent, more than at 0.2 mg.
On hair-count endpoints, 1 mg and 5 mg performed similarly, but both were better than 0.2 mg Roberts 1999. So the DHT curve flattens out earlier than the point where the hair endpoints level off. Going above 1 mg daily gave no more on serum DHT or on the hair-count endpoints; on scalp-measured DHT it did, by 5.3 percentage points, except there the values don't follow the dose monotonically, so a clean conclusion is hard to draw from it.
The reason for the ceiling is the enzyme's two types. Finasteride inhibits type 2 roughly a hundred times more strongly than type 1, and type 1 accounts for roughly a third of circulating DHT PROPECIA drug information. Raising the dose doesn't bring in this share, which is why finasteride stays around 70 percent even if the dose increases many times over. The Hungarian patient information states this in one sentence: the product "is not more effective if taken more often than the recommended daily dose" Hungarian patient information.
The dose approved for hair loss is 1 mg daily, for men. The 5 mg product's indication is benign prostate enlargement, hair loss doesn't appear on that label finasteride 5 mg patient information. Raising the dose therefore takes you outside the approved framework without giving a meaningful additional benefit. The dose is set by the doctor who prescribes it.
Does it make sense to take finasteride and dutasteride together?
There's no study on this. I couldn't find a clinical trial, case series, or professional statement that examined taking the two together, and neither product's patient information mentions the combination.
Looking at it from the mechanism, it's hard to justify. Dutasteride already inhibits the same type 2 enzyme that finasteride does, and with it alone the serum DHT reduction is already around 94 percent, at least as measured in patients treated for prostate enlargement Clark 2004. There's barely any room left for finasteride to add to. This is a deduction from the mechanism, there's no measurement behind it, so nothing more than this can be claimed.
Both are prescription-only, their side effects point in a similar direction, and taking two 5-alpha reductase inhibitors together falls outside approved use. If switching or combining crosses your mind, it's a question for your doctor.
What's the difference between topical (spray, solution) and oral finasteride?
There's also a topical finasteride, sprayed or applied onto the scalp, in spray or solution form. This reaches the bloodstream less, and the evidence suggests it comes with fewer systemic side effects, but there's less evidence for it, and it's typically a compounded (magistral) preparation. The oral tablet has the most proven effect, but it acts on the whole body. The topical form isn't prescription-free either, this is also a medical question.
Can I use it together with minoxidil?
Minoxidil works through a different mechanism (it acts on the follicle's environment, not on DHT), which is why the two are often used together. Whether the combination is warranted and safe for you is something your doctor decides.
Can a natural DHT blocker replace finasteride?
Based on the evidence, it isn't at the same level. For the natural substances there are only small, weak, or lab-only studies, the evidence base behind the prescription drugs is much stronger. It's possible they offer a mild addition for some people, but there isn't enough evidence for them as a full replacement for the drug. This decision is also worth discussing with a doctor.
Is it safe to try RU58841?
Given the current state of knowledge, this can't be called safe. It's an unapproved experimental substance, without published human safety data, and as a research chemical its purity is uncertain too. If someone is considering it anyway, that's their own responsibility, and it can be especially risky without medical consultation.
Is microneedling enough instead of the drug?
Different mechanism, different point of attack. Microneedling stimulates the follicle's environment, a DHT blocker lowers the hormonal cause. They can complement each other, but they aren't interchangeable, and the question of hormonal treatment should be decided with your doctor.
Can I take it as a woman, and what about during pregnancy?
Only under medical supervision, carefully. In women who could become pregnant and during pregnancy, finasteride and dutasteride are not recommended, because they can carry a risk to fetal development, and even touching a broken tablet should be avoided. In women, the underlying cause of the hair loss (for example iron deficiency, thyroid) needs to be investigated first. This is a medical question from start to finish.
Do you need a blood test or medical checkups?
These are prescription drugs, monitoring is up to your doctor. One important practical thing to know: finasteride can affect the PSA (prostate) blood value, so if you're having this test, be sure to mention it to your doctor so they can interpret the result correctly.
Can my DHT level be measured, and is it worth it?
It can be measured, but for patterned hair loss it tells you little. The difference lies in the follicles' androgen sensitivity, and that can't be measured from blood. If the hair loss came on suddenly and is diffuse, testing ferritin and the thyroid is more useful. Your GP or a dermatologist can order the workup.
Does creatine increase DHT, and does it cause hair loss?
This started with a 2009 study of 20 rugby players, where with a loading dose DHT rose 56 percent after 7 days, and stayed 40 percent above baseline in the maintenance phase.van der Merwe 2009 Hair wasn't examined there. In 2025 a 12-week, placebo-controlled study was also published (5 g creatine daily, 38 people completed it), which measured both hormones and hair status: there was no difference between the creatine and placebo groups in DHT, in the DHT/testosterone ratio, or in hair density.JISSN 2025 This is currently the best direct data, and it doesn't support the idea that creatine causes hair loss.
Sources
These references are about the relationship between DHT and hair loss, the mechanism of action and side effects of finasteride and dutasteride, the evidence base behind natural DHT blockers, and the experimental RU58841, drawn from clinical literature and official communications. We cite microneedling as a mechanism, not our own device. These are prescription drugs and an experimental substance respectively, make the decision together with your treating physician.
- Ho CH, Sood T, Zito PM. Androgenetic Alopecia. StatPearls. NBK430924. PMID 28613674 · elevated DHT and 5-alpha reductase in androgenetic hair loss; activation of the androgen receptor shortens the anagen phase, and this triggers follicle miniaturization; the type 2 isoenzyme is the dominant one.
- Zito PM, Bistas KG, Patel P, Syed K. Finasteride. StatPearls. NBK513329. PMID 30020701 · a competitive inhibitor of type 2 (and type 3) 5-alpha reductase; documented side effects: reduced libido, erectile dysfunction, reduced ejaculate volume, gynecomastia; mentions post-finasteride syndrome.
- Al-Horani RA, Patel P. Dutasteride. StatPearls. NBK603726. PMID 38753945 · an irreversible inhibitor of type 1 and type 2 5-alpha reductase, stronger DHT reduction than finasteride; off-label for hair loss; sexual side effects can persist.
- Diviccaro S, Melcangi RC, Giatti S. Post-finasteride syndrome: An emerging clinical problem. Neurobiol Stress. 2020. PMC PMC7231981 (PMID 32435662) · describes the persistent sexual, mood, and cognitive complaints; the syndrome's disputed status (methodological criticism, nocebo); the regulatory patient-information update.
- European Medicines Agency (EMA) / OGYÉI. Medicinal products containing finasteride and dutasteride: Direct Healthcare Professional Communication (DHPC). ogyei.gov.hu (PDF) · a September 2025 Hungarian regulatory communication: suicidal ideation is a confirmed side effect of oral finasteride, mainly in those treated for hair loss. The patient information and a new patient card warn about the risk of low mood, depression, suicidal thoughts, and sexual dysfunction; for dutasteride, a similar warning as a precaution. The communication confirms the separation between the smaller dose used for hair and the larger dose used for the prostate, and the existence of the topical finasteride spray.
- Steiner JF. Clinical pharmacokinetics and pharmacodynamics of finasteride. Clin Pharmacokinet. 1996. PMID 8846625 · despite finasteride's short blood half-life, a single dose maintains DHT suppression for several days; after stopping, DHT returns toward baseline. This is the background for the missed-dose question.
- Rossi A, Mari E, Scarno M, et al. Comparative effectiveness of finasteride vs Serenoa repens in male androgenetic alopecia. Int J Immunopathol Pharmacol. 2012. PMID 23298508 · open-label (unblinded) trial, saw palmetto vs finasteride; hair growth improved in significantly more people on finasteride. Saw palmetto's 5-alpha reductase inhibition is weak.
- Cho YH, Lee SY, Jeong DW, et al. Effect of pumpkin seed oil on hair growth in men with androgenetic alopecia. Evid Based Complement Alternat Med. 2014. PMID 24864154 · randomized, placebo-controlled trial, but the product is a combination (multiple active ingredients), so the effect can't be attributed to pumpkin seed oil alone.
- Panahi Y, Taghizadeh M, Marzony ET, Sahebkar A. Rosemary oil vs minoxidil for the treatment of androgenetic alopecia. Skinmed. 2015. PMID 25842469 · rosemary oil was compared against a minoxidil solution, not against finasteride; small trial. There is no rosemary oil vs finasteride trial.
- Kwon OS, Han JH, Yoo HG, et al. Human hair growth enhancement in vitro by green tea epigallocatechin-3-gallate (EGCG). Phytomedicine. 2007. PMID 17092697; Fischer TW, Hipler UC, Elsner P. Effect of caffeine on hair follicle growth in vitro. Int J Dermatol. 2007. PMID 17214716. The open-label human trial of topical caffeine compared with minoxidil: Dhurat R, Chitallia J, May A, et al. Skin Pharmacol Physiol. 2017. PMID 29055953 · for EGCG there is only laboratory (cell and follicle culture) data; caffeine doesn't inhibit DHT, it works through a different route.
- Battmann T, Bonfils A, Branche C, et al. RU 58841, a new specific topical antiandrogen. J Steroid Biochem Mol Biol. 1994. PMID 8136306; Pan HJ, Wilding G, Uno H, et al. Evaluation of RU58841 as a topical anti-alopecia agent in stumptailed macaques. Endocrine. 1998. PMID 9798729 · a topical androgen-receptor antagonist; the available data is animal testing and laboratory models. The substance was never approved anywhere, its development was stopped, there is no published human efficacy or safety trial.
- Dhurat R, Sukesh M, Avhad G, et al. A Randomized Evaluator Blinded Study of Effect of Microneedling in Androgenetic Alopecia. Int J Trichology. 2013. PMID 23960389 · microneedling plus minoxidil vs minoxidil alone, with a clinical device (roller). The basis for the mechanism citation, not our home device.
- Ntshingila S, Oputu O, Arowolo AT, Khumalo NP. Androgenetic alopecia: An update. JAAD Int. 2023. PMID 37823040 · PMC PMC10562178 · testosterone converts to DHT via type 2 5-alpha reductase, activation of the androgen receptor miniaturizes the follicle and shortens the anagen phase, follicles at the back of the head are less sensitive due to methylation of the androgen receptor.
- van der Merwe J, Brooks NE, Myburgh KH. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clin J Sport Med. 2009. PMID 19741313 · n=20, loading-dose regimen, DHT +56% after 7 days and +40% in the maintenance phase; hair wasn't examined.
- Moon JM, et al. Does creatine cause hair loss? A 12-week randomized controlled trial. J Int Soc Sports Nutr. 2025. PMID 40265319 · PMC PMC12020143 · 5 g creatine daily, 38 people completed it: no difference from placebo in DHT, in the DHT/testosterone ratio, or in hair parameters.
- NNGYK/EMA: IMPORTANT DRUG SAFETY INFORMATION. Medicinal products containing finasteride and dutasteride: new risk-minimization measures to reduce the risk of suicidal ideation. 2025.09.03. ogyei.gov.hu (PDF) · this is the verbatim source of the warning about suicidal thoughts, the introduction of the patient card, the 325/313/13 case counts with the context of 270 and 82 million patient-years of exposure, the "frequency cannot be established" finding, the separate note on topical finasteride, and the distinction between indications (dutasteride is only indicated for benign prostate enlargement).
- Officially approved patient information, finasteride 1 mg film-coated tablet (public assessment report). ogyei.gov.hu (PDF) · this is the source of the hair-loss indication, the description of the mechanism of action, and verbatim, the statement that women shouldn't take it, that studies show it isn't effective in women with hair loss, and that pregnant or potentially pregnant women shouldn't even come into contact with a broken or crushed tablet.
- 44/2004. (IV. 28.) ESzCsM regulation on the prescribing and dispensing of medicinal products for human use. njt.jog.gov.hu · under Section 3(1) a doctor may prescribe a drug authorized in Hungary or in the EU (the rule doesn't restrict this to a specific specialty); under Section 20(1) a prescription-only drug prescribed by a foreign doctor "may only be dispensed" if its identity, quantity, and dosage can be precisely established; under Section 21/A(1) only products dispensable without a prescription and not covered by public funding can be ordered online.
- Directive 2011/24/EU of the European Parliament and of the Council on the application of patients' rights in cross-border healthcare, Article 11. eur-lex.europa.eu · the rule for recognizing a prescription issued in another member state and its three limits, including that recognition doesn't affect a pharmacist's right to refuse dispensing on ethical grounds, and doesn't affect cost reimbursement.
- EESZT pharmacy information (e-prescription). e-egeszsegugy.gov.hu · this is the verbatim source for the statement that registering a prescription written abroad in the EESZT system is not currently supported at the pharmacy.
- Mobi Doctor LTD (mobidoctor.eu), its own terms and conditions and privacy notice, and its Budapest landing page. Retrieved 2026.07.26. Terms · Privacy · the provider is a privately held company registered in Malta (company registration number C90869); according to the marketing page the drug can be redeemed "at any Budapest pharmacy", while the terms exclude liability in case legal pharmacies refuse to dispense it.
- Public price lists of private dermatology practices, retrieved 2026.07.26. Dr. Rudolf Éva · Dr. Bodnár Edina · Myderm Budapest · the consultation prices published by the three practices at the time were 25 000, 27 000, and 35 000 forints; this is where the range in the article comes from. Prices can change.
- World Health Organization: Substandard and falsified medical products (fact sheet, updated 2024.12.03). who.int · this is the verbatim source for the statement that substandard and falsified products are typically sold online or in informal markets. The previously widely cited "50%" figure comes from a since-retracted source, and was narrower in scope to begin with, so this article doesn't use it.
- Drake L, Hordinsky M, Fiedler V, et al. The effects of finasteride on scalp skin and serum androgen levels in men with androgenetic alopecia. J Am Acad Dermatol. 1999. PMID 10495374 · 249 men with androgenetic hair loss, scalp biopsy and blood draw, 42 days. Verbatim: serum DHT fell by 49.5, 68.6, 71.4, and 72.2 percent in the 0.05, 0.2, 1, and 5 mg groups, and scalp DHT by 13.0 percent with placebo and by 14.9, 61.6, 56.5, 64.1, and 69.4 percent at the 0.01, 0.05, 0.2, 1, and 5 mg doses. The authors' conclusion: already 0.2 mg daily maximally lowered both scalp and serum DHT. This is the source of the dose ceiling.
- Roberts JL, Fiedler V, Imperato-McGinley J, et al. Clinical dose ranging studies with finasteride, a type 2 5alpha-reductase inhibitor, in men with male pattern hair loss. J Am Acad Dermatol. 1999. PMID 10495375 · men aged 18-36, 5 / 1 / 0.2 / 0.01 mg or placebo. Verbatim: a confirmed effect on every endpoint at 0.2 mg daily and higher doses, with 1 and 5 mg showing similar efficacy, which was better than the lower doses. This is the source for the finding that the five-fold dose gives no more on the hair-count endpoints either.
- Clark RV, Hermann DJ, Cunningham GR, et al. Marked suppression of dihydrotestosterone in men with benign prostatic hyperplasia by dutasteride, a dual 5alpha-reductase inhibitor. J Clin Endocrinol Metab. 2004. PMID 15126539 · 399 patients with prostate enlargement, 24 weeks, randomized. Verbatim: the average DHT reduction was 98.4 ± 1.2 percent with 5.0 mg dutasteride and 94.7 ± 3.3 percent with 0.5 mg dutasteride, versus 70.8 ± 18.3 percent measured with 5 mg finasteride. ⚠️ Measured in prostate patients, not in men with hair loss, and the spread also shows that finasteride's individual response is much more uneven.
- Amory JK, Wang C, Swerdloff RS, et al. The effect of 5alpha-reductase inhibition with dutasteride and finasteride on semen parameters and serum hormones in healthy men. J Clin Endocrinol Metab. 2007. PMID 17299062 · 99 healthy men, randomized, double-blind, one year, dutasteride 0.5 mg vs finasteride 5 mg vs placebo. ⚠️ The finasteride arm here is the 5 mg dose, five times the 1 mg daily dose approved for hair loss. Verbatim: both drugs significantly lowered serum DHT compared to placebo, dutasteride by 94 and finasteride by 73 percent. The same study also measured semen parameters, and found that the mild decrease appears to reverse after stopping the drug.
- PROPECIA (finasteride 1 mg) officially approved drug information, FDA. DailyMed · this is the verbatim source for: type 1 5-alpha reductase accounting for roughly a third of circulating DHT, type 2 for two-thirds; finasteride showing a hundred-fold selectivity for type 2 (IC50 500 and 4.2 nanomolar respectively); the enzyme-inhibitor complex breaking down slowly, with a half-life of roughly 30 days for type 2 and 14 days for type 1; and a single 1 mg tablet achieving a 65 percent DHT reduction within 24 hours. The half-life is 5-6 hours in men aged 18-60, 8 hours over 70. This is also the source of the registration-trial frequency of sexual side effects: in year 1, 36 of 945 men (3.8 percent) on the finasteride arm, versus 20 of 934 (2.1 percent) on the placebo arm.
- Finasteride 5 mg (PROSCAR) officially approved drug information, FDA. DailyMed · the 5 mg product's indication is benign prostate enlargement, hair loss doesn't appear on this label. This is also the verbatim source for: in healthy volunteers treated with finasteride for 14 days, DHT returned to pre-treatment levels roughly two weeks after stopping, and at doses ranging from 1 mg to 100 mg, DHT content in surgically removed prostate tissue was measured at roughly 80 percent lower in all cases.
- AVODART (dutasteride 0.5 mg) officially approved drug information, FDA. DailyMed · this is the verbatim source for: dutasteride's terminal half-life at steady state being roughly 5 weeks, the drug remaining detectable in blood serum for 4-6 months after stopping treatment, and serum DHT falling by 85 percent after one week and 90 percent after two weeks at 0.5 mg daily; in those treated for four years, by 94 percent at 1 year, 93 percent at 2 years, and 95 percent at 3 and 4 years.
- Finasterid-Teva 1 mg film-coated tablet, officially approved Hungarian patient information. ogyei.gov.hu · retrieved 2026.07.28. This is the verbatim source for: the product being "not more effective if taken more often than the recommended daily dose"; that for a forgotten tablet, "skip the missed dose and take the next one as usual. Do not take a double dose to make up for the missed dose"; that the full effect may take up to 3-6 months to develop; and that after stopping, hair grown as a result of treatment likely sheds within 9-12 months. ⚠️ This patient information is older than the 2025 regulatory drug-safety communication, the current state of the side-effect warnings is given by sources 5 and 16.
- Propecia 1 mg film-coated tablet, summary of product characteristics (SmPC), 4.8 Undesirable effects. medicines.org.uk · retrieved 2026.07.28. For the 1 mg product used for hair loss, the European summary of product characteristics lists anxiety and suicidal ideation among the psychiatric side effects with an unknown frequency, and reduced libido and depression as uncommon. Among the genital and breast side effects, erectile dysfunction and ejaculation disorders are listed as uncommon, and breast tenderness and enlargement, testicular pain, blood in the semen, and infertility with an unknown frequency. This entry provides the European anchor for the side-effect list, because the patient information in source 31 is older. This is also the source for: because of any adverse event, 1.7 percent on the 945-person finasteride arm stopped taking it, versus 2.1 percent on the 934-person placebo arm; that specifically because of sexual complaints it was about 1 percent on both arms in the first year; that these complaints fell from 3.8 percent in the first year to 0.6 percent over the following four years; and that depression comes from post-marketing surveillance, and didn't differ from placebo in the phase-III trials.
- Patel P, Nessel TA, Kumar DD. Minoxidil. StatPearls. 2023. Bookshelf ID NBK482378 · PMID 29494000 · minoxidil is a potassium-channel-opening vasodilator; its proposed mechanisms for hair don’t act through inhibiting 5-alpha reductase.