Weighing up minoxidil vs finasteride for male pattern hair loss? You're looking at the only two licensed treatments for it in the UK.
Minoxidil is a topical treatment you apply to your scalp. Finasteride is a daily tablet that works from the inside out. Neither is a cure, but both have a strong evidence base behind them.
This guide compares how minoxidil and finasteride work, how effective each one is on its own, what the side effects look like, and whether combining them gives better results than either one alone.
Different routes, different targets. Minoxidil works on your scalp, finasteride works on the hormone behind hair loss.
How do minoxidil and finasteride work?
Both treat androgenetic alopecia, the medical name for male pattern baldness. But minoxidil and finasteride act on completely different parts of the hair loss process.
Minoxidil
Minoxidil is a vasodilator, which means it widens the blood vessels in your scalp. That increases blood flow to your hair follicles. It's also thought to extend the growth (anagen) phase of the hair cycle, so hairs grow for longer before they're shed.1
You apply it directly to your scalp as a solution or foam, usually once or twice a day. In the UK, it's sold under the brand name Regaine.
Minoxidil is available without a prescription. It's also the licensed option for women with pattern hair loss.
Finasteride
Finasteride takes a different approach. It's a 5-alpha reductase inhibitor, which means it blocks the enzyme that turns testosterone into dihydrotestosterone (DHT). DHT is the hormone largely responsible for shrinking hair follicles in male pattern baldness.2
Because it works on your hormones rather than your scalp, you take finasteride as a daily 1mg tablet. It's available as the brand Propecia and in generic form, and it's prescription-only.
Finasteride isn't suitable for women, especially if they're pregnant or could become pregnant, because of the risk of birth defects.
Which is more effective, minoxidil or finasteride?
In a randomised study of 450 men with androgenetic alopecia, 80.5% of those taking finasteride alone improved after 12 months. That compares with 59% of those using topical minoxidil alone.3
That doesn't make minoxidil a weak option. Both are recognised, evidence-based treatments. But it does suggest finasteride's hormonal approach works for a somewhat higher proportion of men.
The timelines differ slightly too. Minoxidil can bring visible changes from around 2 to 4 months, though it's worth allowing up to 6 months to judge the full effect.1 Finasteride tends to show first improvements from around 3 to 6 months, with the full benefit taking up to a year.2
Give either treatment at least 6 months before deciding whether it's working for you.
Both treatments only work for as long as you keep using them. Stop, and hair loss usually picks up again within several months.
What are the side effects of minoxidil and finasteride?
Because you use minoxidil and finasteride in different ways, their side effects look quite different too.
Minoxidil side effects
- Scalp irritation - common (affects up to 1 in 10 people). Dryness, itching or redness where you apply it, which often improves as your scalp adjusts.
- Initial shedding - common in the first few weeks. It's a sign your hair growth cycle is resetting, rather than a cause for concern.
- Unwanted hair growth - uncommon (affects up to 1 in 100 people). It can appear on your forehead or face if the product spreads beyond where you meant to apply it.
- Palpitations, dizziness or fluid retention - rare (affects up to 1 in 1,000 people) with topical use, and more relevant to oral minoxidil, which some clinics prescribe off-label at low doses. Stop treatment and get medical advice if this happens.1
Finasteride side effects
Depression or suicidal thoughts? Get help straight away. Call 999, contact NHS 111, or call Samaritans free on 116 123.
- Reduced libido and erection problems - for most men these ease, though they can persist in a minority.4
- Reduced ejaculate volume - uncommon.
- Mood changes, including depression - in May 2026, the MHRA strengthened its safety warnings for finasteride. It clarified that sexual side effects may contribute to mood problems, and that depression and suicidal thoughts have also been reported on their own, separate from sexual side effects.5 If you notice low mood or suicidal thoughts, stop taking finasteride and contact a GP or prescriber as soon as possible.
- Breast changes - rare. Any lumps, pain, swelling or nipple discharge should be checked by a doctor.
Our full guide to finasteride side effects covers what to expect in more detail, including how to manage the more common ones.
Can you use minoxidil and finasteride together?
Yes. Because minoxidil and finasteride work in different ways, using both doesn't double up on the same risks. Each one keeps its own separate side effects.
In the same 450-patient study, 94.1% of men using the combination improved, compared with 80.5% for finasteride alone and 59% for minoxidil alone.3
A more recent systematic review of seven randomised trials reached a similar conclusion. It found that a combined minoxidil and finasteride solution gave bigger improvements in hair density and thickness than minoxidil alone.6
Already using one and thinking about adding the other? Have a quick chat with a pharmacist or prescriber first. That's especially important if you have a heart condition or blood pressure problem (relevant to minoxidil), or any history of low mood (relevant to finasteride).
Which treatment might suit you best?
When it comes to finasteride vs minoxidil, there's no single right answer. But a few factors tend to guide the decision:
- How you'd rather take it - a daily tablet (finasteride) or a product you apply to your scalp once or twice a day (minoxidil).
- Whether you're male or female - finasteride isn't suitable for women, while minoxidil is the licensed option for female pattern hair loss, including Regaine for Women.
- Where your hair loss is - both tend to work best on thinning at the crown or mid-scalp, rather than a fully receded hairline.
- How early you're starting - both work best in the earlier stages of hair loss, before follicles have shrunk too far to respond.
- How you feel about hormonal side effects - if sexual side effects or mood changes worry you, minoxidil's non-hormonal approach may be the more comfortable place to start.
Plenty of men start with one treatment and add the other later, or start with both from the outset under a prescriber's guidance. If myths about what causes hair loss are shaping your decision, our hair loss myths article is worth a read before you start.
When should you seek medical advice?
Speak to a GP or pharmacist if:
- You notice new depression, anxiety, or thoughts of suicide while taking finasteride
- You experience chest pain, a rapid heartbeat, or sudden swelling of the hands or feet while using minoxidil
- Your hair loss is sudden, patchy, or comes with scalp pain, scarring, or redness, as this can point to a different condition that needs diagnosis before any treatment starts
- You see no improvement at all after 6 to 12 months of consistent, correct use
Frequently asked questions
Which is better, minoxidil or finasteride?
Neither is universally "better". They work differently and suit different people. Head-to-head data shows finasteride producing a somewhat higher response rate than minoxidil, but minoxidil is non-hormonal, available without a prescription, and licensed for women too. The right choice depends on how you'd rather take it and your tolerance for hormonal side effects.
Do you need a prescription for minoxidil or finasteride?
Minoxidil is a licensed over-the-counter treatment, so you don't need a prescription to buy Regaine or generic minoxidil. Finasteride is prescription-only in the UK, whether you're using branded Propecia or a generic version, so you'll need a consultation before starting it.
How long does finasteride take to work for hair loss?
Most men see some improvement after 3 to 6 months of daily use, though it can take up to a year to judge the full effect. Finasteride only keeps working for as long as you keep taking it, so hair loss typically resumes within months of stopping.
How long does minoxidil take to work?
Visible changes can start from around 2 to 4 months, but it's worth using minoxidil consistently for at least 6 months before deciding whether it's working. Some people notice increased shedding in the first few weeks, which usually settles as new growth begins.
Can you use minoxidil and finasteride together?
Yes. Because they work through different mechanisms, minoxidil and finasteride can be used together, and studies suggest the combination produces better results than either treatment alone. It's still worth checking with a pharmacist or prescriber first, especially if you have any relevant health conditions.
Is minoxidil safe for women?
Minoxidil is licensed for female pattern hair loss and is generally considered safe when used as directed, usually at a lower strength than the version marketed for men. Finasteride, on the other hand, isn't suitable for women, particularly those who are pregnant or could become pregnant.
What happens if you stop using minoxidil or taking finasteride?
Both treatments only work while you continue using them. If you stop, hair loss usually resumes within a few months as DHT levels or scalp blood flow return to their untreated pattern, and any hair gained on treatment will gradually be lost.
Does finasteride cause cancer?
There's no established link between finasteride and cancer overall, but rare reports of male breast cancer have been made in men taking finasteride. It's rare, but you should tell your doctor about any lumps, pain, swelling, or nipple discharge so it can be checked.
References
- Royal Berkshire NHS Foundation Trust. Minoxidil for hair loss (patient information leaflet). 2025. royalberkshire.nhs.uk
- NHS. Finasteride: a medicine for benign prostate enlargement and hair loss. nhs.uk
- Hu R, et al. Combined treatment with oral finasteride and topical minoxidil in male androgenetic alopecia: a randomised and comparative study in Chinese patients. 2015. PMID: 26031764. pubmed.ncbi.nlm.nih.gov
- NHS. Common questions about finasteride. nhs.uk
- Medicines and Healthcare products Regulatory Agency. Finasteride and dutasteride: updated safety warnings for psychiatric side effects and sexual dysfunction. GOV.UK Drug Safety Update; 2026. gov.uk
- Li Y, Huang Q, Zhou Z, Zhang Y. Comparing minoxidil-finasteride mixed solution with minoxidil solution alone for male androgenetic alopecia: a systematic review and meta-analysis of randomised controlled trials. Frontiers in Medicine. 2025. doi:10.3389/fmed.2025.1632139
This article is intended for informational purposes only and does not replace professional medical advice. Always read the patient information leaflet supplied with your medication and speak to a healthcare professional if you have specific concerns.