If you're weighing up minoxidil vs finasteride for male pattern hair loss, you're looking at the only two licensed treatments for the condition in the UK. Minoxidil is a topical treatment you apply to the scalp, while 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 you better results than either treatment alone.
How do minoxidil and finasteride work?
Although both treat androgenetic alopecia (the medical name for male pattern baldness), minoxidil and finasteride act on completely different parts of the hair loss process.
Minoxidil
Minoxidil is a vasodilator, meaning it widens the blood vessels in the scalp. This increases blood flow to the hair follicles and is thought to extend the growth (anagen) phase of the hair cycle, so hairs grow for longer before they're shed.1 It's applied directly to the scalp as a solution or foam, usually once or twice a day, and is sold in the UK under the brand name Regaine. Because it isn't a hormonal treatment, minoxidil doesn't require a prescription and is 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 converts testosterone into dihydrotestosterone (DHT), the hormone largely responsible for shrinking hair follicles in male pattern baldness.2 Because it works on a hormonal level rather than a local one, finasteride is taken as a daily 1mg tablet rather than applied to the scalp. It's available under the brand name Propecia as well as in generic form, and it's prescription-only. Finasteride isn't suitable for women, particularly those who are pregnant or may become pregnant, due to the risk of birth defects.
Which is more effective, minoxidil or finasteride?
In a randomised comparative study of 450 men with androgenetic alopecia, 80.5% of those taking finasteride alone showed improvement after 12 months, compared with 59% of those using topical minoxidil alone.3 That doesn't mean minoxidil is a weak option. Both are recognised, evidence-based treatments, but it does suggest finasteride's hormonal approach produces a somewhat higher response rate for many men.
The timelines also differ slightly. Minoxidil can prompt 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 initial improvement from around 3 to 6 months, with the full benefit taking up to a year to become clear.2 Both treatments only work for as long as you keep using them. Stop, and hair loss will typically resume within several months as DHT levels or blood flow return to their untreated pattern.
What are the side effects of minoxidil and finasteride?
Because minoxidil and finasteride are administered differently, their side effect profiles look quite different too.
Minoxidil side effects
- Scalp irritation - common (affects up to 1 in 10 people). Dryness, itching, or redness where the product is applied, often improves as the scalp adjusts.
- Initial shedding - common in the first few weeks of use. This is a sign the hair growth cycle is resetting rather than a cause for concern.
- Unwanted hair growth - uncommon (affects up to 1 in 100 people). Can appear on the forehead or face if the product spreads beyond the intended area.
- 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 seek medical advice if this occurs.1
Finasteride side effects
- Reduced libido and erectile dysfunction - common, affecting around 2 to 4% more men than placebo; for most this eases within the first year, though it can persist for a minority.4
- Reduced ejaculate volume - uncommon.
- Mood changes, including depression - in May 2026, the MHRA strengthened its safety warnings for finasteride, clarifying that sexual dysfunction may contribute to mood disorders, and that depression or suicidal thoughts have also been reported independently of sexual side effects.5 Anyone who experiences low mood or suicidal thoughts should 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?
Because minoxidil and finasteride work through different mechanisms, using them together doesn't mean doubling up on the same risks - each keeps its own separate side effect profile. In the same 450-patient study referenced above, 94.1% of men using the combination showed improvement, 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, finding that a combined minoxidil and finasteride solution produced greater improvements in hair density and thickness than minoxidil alone.6
If you're already using one treatment and thinking about adding the other, it's worth a quick conversation with a pharmacist or prescriber first, particularly if you have a heart condition or blood pressure that's 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) versus a product applied to the 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 treatments tend to work best on thinning at the crown or mid-scalp rather than a fully receded hairline.
- How early you're starting treatment - both minoxidil and finasteride work best when started in the earlier stages of hair loss, before follicles have shrunk too far to respond.
- Your tolerance for hormonal side effects - if sexual side effects or mood changes are a concern, minoxidil's non-hormonal mechanism may be the more comfortable starting point.
Plenty of men use one treatment first and add the other later, or start with both from the outset under guidance from a prescriber. If some of the myths around what causes hair loss are influencing 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.