Minoxidil and finasteride or dutasteride: How Much Does Adding the Second One Actually Get You?

Yes, they can be taken together, that bit is settled. But is using them together worth your time and money? How much will it add to your hair loss protocol, which of the two is doing the heavy lifting, and what order to start them in.

If you're taking one type of hair loss medication and you're wondering whether to add another the short answer is that combination therapy beats taking either medication on its own. The gain is real, but the gains are additive and aren't magic. Lets dive into whether it's worth it for you to add and any risks involved.

Simply put, dihydrotestosterone (DHT) blockers (finasteride and dutasteride) address the cause of your hair loss. They act to reduce the level of testosterone that gets converted to dihydrotestosterone in your body. DHT plays a role in hair loss as it binds to scalp follicles causing hair to get thin and fall out. Reducing the levels of DHT at the scalp level therefore reduces the amount of hair that thins and falls out. None of this means your DHT is too high. Levels are usually normal, it's how sensitive your follicles are to DHT that decides whether you lose hair, and that comes down to what you've inherited.

Minoxidil doesn't touch or reduce DHT at all. It keeps hairs in the active growing phase (anagen) for longer and shortens the resting phase (telogen). It's also a vasodilator, though that isn't the whole story, or every blood pressure tablet would grow hair. We've gone through this properly in Minoxidil - How does it work and will it work for me?.

These two different pathways are why combination therapy is so good, as you're slowing the loss with one and pushing growth with the other. A lot of sites out there imply that adding both of these produces a multiplication type effect, whereas the effect seen is more additive you get roughly what one gives you plus what the other gives you.

The clearest number we have comes from a 2025 review that looked at seven randomised trials, 396 men in total. It compared a combined topical minoxidil and finasteride against minoxidil on its own. The combination came out ahead on hair density by 9.22 hairs per cm² (p=0.04), on hair thickness by 2.26 μm (p=0.005), and on before and after photo scoring by 0.79 points (p<0.00001). ^[1]

Nine extra hairs per cm² may seem like a small amount but that is nine hairs within a patch of scalp measuring only 1 cm by 1 cm roughly the size of a fingernail, and the chart review we looked at in our oral and topical minoxidil article saw gains of around 18 hairs per cm² from oral minoxidil alone. While these were not like-for-like studies and involved different patients and treatment formulations, it helps show that an additional nine hairs within such a small area may be more meaningful than it first sounds.

Men on the combination were also over three times more likely to land in the "marked improvement" category (odds ratio 3.29, p=0.015). That is the difference between a result you can measure and a result you can see in the mirror.^[2][3]

A separate 2025 network meta-analysis, which ranked twenty different minoxidil combinations against each other, found finasteride plus minoxidil was the most effective drug combination for men.

Then there's a three arm trial from 2024 that put the combination head to head against each drug on its own in 42 men over six months. The combination came out ahead of both, but the more useful finding was how quickly. It pulled clear at the three month mark and the researchers made the point that this matters for a reason that has nothing to do with biology: the main reason men give up on minoxidil is that they can't see it doing anything. Getting to a visible result sooner is part of why the combination works better in practice, not just on paper.^[4][5]

There hasn't been a trial that we can definitively quote from to give us a solid answer to this. Every study we've looked at either started people on the combination from day one or compared it against a single drug. Nobody has run a trial where one group started both together and another staggered them, so there's no evidence to hand you here. So, it really boils down to the prescriber's opinion, and your own decision and what you are comfortable with and your treatment goals.

The case for starting both at once is straightforward. The combination works better and it works sooner, so you want to get on with it. If you start treatment on just one type of medication, you're not getting the benefit of the other, and your hair loss will continue while you are making a decision.

Staggering them is done mainly for safety and seeing how your body responds to the medication and again what you hope to gain from treatment. Start both at the same time and you've got two drugs in your system, each with its own side effects, and no way of telling them apart. If something feels off at week six you might not be 100% sure what is causing it. If you are hoping to just retain your hair you may only need a DHT blocker, again saving you money, but you wouldn't know if you started both together. 

If you plan to stagger the starting, leave at least four to six weeks between starting the first and adding the second, and you've given yourself a baseline. You know what that drug does and feels like. When you add the second, anything new is much easier to pin down, and you can make a proper decision about which one to adjust if any. 

If you're already on both then the question is different. You're not starting, you're deciding whether to add. It is worth asking yourself:

1. How long have you been on it? Under six months and you haven't reached the full effect of the treatment yet. Most of these drugs need six to twelve months for a fair assessment.
2. What's actually happened? Holding steady is a result, not a failure. If you started with visible thinning and you've stopped losing ground, the drug is working.
3. Are you still losing? If you're six to twelve months in and still going backwards, adding the second drug is a reasonable next step.

So either style has its advantages and it depends more on your own personal situation than on the drugs.

Below are the four situations we see most often.

"I use minoxidil but I'm still gradually receding"

This is the clearest case for adding a DHT blocker, and probably the most common one we see. Minoxidil doesn't touch DHT, so if you're steadily losing ground the underlying process is carrying on regardless of how well the minoxidil is working. You can be growing hair and losing hair at the same time, and receding is a sign DHT is still affecting your hair line.

Adding finasteride or dutasteride can slow this down and it is better to start sooner than later.

"Finasteride has stopped my hair loss, but I want more visible density"

Adding minoxidil is the right move, the finasteride is keeping your hair line where it is, and adding minoxidil can help push visible growth on the follicles you've still got.

"I'm starting from scratch and want the greatest possible improvement"

Start with both and decide whether you want to start them on the same day or a few weeks apart. The evidence on the combination outperforming either drug alone is about as consistent as anything gets in this area.

"I mainly want to preserve what I've got and keep it simple"

Then one drug is a perfectly reasonable choice, and the DHT blocker is the one to pick. It's a tablet once a day with nothing to apply, nothing to dry, and nothing to work round in the morning. If you were to choose topical minoxidil it is the more demanding of the two in daily terms, and applying it twice daily is a reason most people think it doesn't work. Minoxidil will also not help you hold onto your existing hair line as well as a DHT blocker would.

There's no rule saying you have to be on both. Plenty of men do well on a DHT blocker alone for years, and adding minoxidil later is always available if you change your mind.

Two things to sort before you start any treatment. Always take photos in the same spot and with the same lighting, because in six months you won't remember what you looked like, and it can be difficult to distinguish genuine progress from no visible change or continued thinning.

No current medication can regrow hair from follicles that have already gone, and once an area is bald and shiny there's nothing left to work with and neither drug is a course you finish, so the results last as long as you keep taking them. And you're now running two treatments, which means two lots of cost and two things to remember.

Most of the combination data used topical finasteride mixed with minoxidil, not the 1mg tablet that most men in the UK are actually prescribed, so applying it to tablet plus minoxidil is partly extrapolation. The trials are short, mostly six months, when this is a decades-long condition. The three arm trial had 42 men in it. And one 12 week RCT of topical finasteride 0.1% with minoxidil found both groups improved with no significant difference between them, which is a fair counterweight to everything above even though it was short and used a lower concentration.