Finasteride and dutasteride for hair loss
5-alpha-reductase inhibitors · finasteride 1 mg · dutasteride 0.5 mg · topical finasteride
Finasteride is the hair-loss drug men search for and worry about in equal measure; 'finasteride Singapore' and 'topical finasteride' both show steady demand, and the debate online is almost entirely about sexual side effects.
Search interest: about 400 searches a month in Singapore for “finasteride singapore” (Ahrefs, October 2026).
The side-effect debate is loud and the trial numbers are small; the right conversation is a frank one with a doctor, not a thread.
Reviewed against the Aesthetics International standard. Category: Hair.
Does Finasteride and dutasteride for hair loss work?
Established. The side-effect debate is loud and the trial numbers are small; the right conversation is a frank one with a doctor, not a thread. Finasteride is among the best-studied drugs in dermatology, with large placebo-controlled trials showing halted progression in most men and regrowth in many.
- Verdict
- Established Long clinical track record. Results depend on selection and technique more than on the device.
- Evidence base
- 5 PubMed-indexed studies cited below, including systematic reviews, meta-analyses.
- Suits
- Men with early to moderate pattern hair loss who want to keep what they have and regain some density, who accept indefinite treatment and the small risk of sexual side effects; often combined with minoxidil and considered before or alongside transplantation.
- Not for
- Women who are or may become pregnant; men planning conception without discussion with their doctor; anyone expecting regrowth on long-bald skin; anyone unwilling to continue the drug.
- In Singapore
- Finasteride and dutasteride are prescription-only in Singapore and off-label for hair loss in the case of dutasteride; they are prescribed by doctors after assessment and may not be advertised to the public, which is why hair clinics describe 'oral medication' rather than naming them.
- Category
- Hair · about 400 searches a month in Singapore for “finasteride singapore”
- Reviewed
- 6 October 2026 by Aesthetics International. Revised as evidence and regulation change.
What it is
Finasteride and dutasteride block the 5-alpha-reductase enzyme that converts testosterone to dihydrotestosterone (DHT), the hormone that miniaturises genetically sensitive follicles in male pattern hair loss. Finasteride 1 mg daily blocks one form of the enzyme; dutasteride blocks both and lowers DHT further. Topical finasteride is a newer route intended to act on the scalp with less systemic exposure.
How it works
Taken daily, the drugs lower scalp and blood DHT within days; follicle miniaturisation slows, shedding falls over months and some regrowth of thinned hair appears by six to twelve months. The effect depends on continued use. In women the evidence is limited and the drugs are not used in pregnancy because they affect male fetal development.
What the evidence says
Finasteride is among the best-studied drugs in dermatology, with large placebo-controlled trials showing halted progression in most men and regrowth in many. A 2014 network meta-analysis and a 2019 systematic review found dutasteride more effective than finasteride for hair count, with a broadly similar adverse-effect profile. A 2019 systematic review and meta-analysis of sexual adverse effects found a small but real increase over placebo, mostly reversible; persistent symptoms after stopping are reported but uncommon and causation is debated. A 2018 systematic review of topical finasteride found efficacy with lower systemic DHT suppression, from smaller studies.
What people are saying
Paraphrased from public discussion on TikTok, Instagram, Reddit and in the press. Not testimonials, and not about any one clinic. Reported in: reddit.com, reddit.com.
What the studies show
- network meta-analysis
Both drugs increased hair count versus placebo; dutasteride 0.5 mg ranked above finasteride 1 mg for efficacy, with no significant difference in adverse events in the pooled trials.
The efficacy and safety of 5α-reductase inhibitors in androgenetic alopecia: a network meta-analysis and benefit-risk assessment of finasteride and dutasteride. — J Dermatolog Treat, 2014. PMID 23768246.
- meta-analysis
Dutasteride produced greater improvement in hair count than finasteride at 24 weeks with a similar incidence of sexual adverse effects.
The efficacy and safety of dutasteride compared with finasteride in treating men with androgenetic alopecia: a systematic review and meta-analysis. — Clin Interv Aging, 2019. PMID 30863034.
- meta-analysis
Sexual adverse effects were modestly more frequent with 5-alpha-reductase inhibitors than placebo in randomised trials, with most reports mild and reversible.
Adverse Sexual Effects of Treatment with Finasteride or Dutasteride for Male Androgenetic Alopecia: A Systematic Review and Meta-analysis. — Acta Derm Venereol, 2019. PMID 30206635.
- systematic review
Topical finasteride improved hair parameters with less systemic DHT reduction than oral dosing in the available studies, which were small and short.
A Systematic Review of Topical Finasteride in the Treatment of Androgenetic Alopecia in Men and Women. — J Drugs Dermatol, 2018. PMID 29601622.
- review
The three oral agents act by different mechanisms and are commonly combined; dutasteride showed the largest effect on hair count and oral minoxidil the broadest tolerability concerns.
Comparison of oral minoxidil, finasteride, and dutasteride for treating androgenetic alopecia. — J Dermatolog Treat, 2022. PMID 35920739.
Studies are selected for relevance and quality, not for agreement with the verdict; PubMed records are linked so the reader can check them.
Who it suits
Suits
Men with early to moderate pattern hair loss who want to keep what they have and regain some density, who accept indefinite treatment and the small risk of sexual side effects; often combined with minoxidil and considered before or alongside transplantation.
Not for
Women who are or may become pregnant; men planning conception without discussion with their doctor; anyone expecting regrowth on long-bald skin; anyone unwilling to continue the drug.
Alternatives
The two reviewed treatments most often weighed against Finasteride and dutasteride for hair loss, on the same standard.
| Finasteride and dutasteride for hair loss | Minoxidil | Scalp microneedling for hair | |
|---|---|---|---|
| Verdict | Established | Established | Established |
| What it is | Finasteride and dutasteride block the 5-alpha-reductase enzyme that converts testosterone to dihydrotestosterone (DHT), the hormone that miniaturises genetically sensitive follicles in male pattern hair loss. | Minoxidil was a blood-pressure medicine whose hair-growth side effect became a treatment. | Rolling or stamping fine needles across the thinning scalp to create controlled micro-injuries, usually before a topical hair-growth medicine is applied. |
| Evidence base | 5 PubMed-indexed studies cited below, including systematic reviews, meta-analyses. | 5 PubMed-indexed studies cited below, including meta-analyses, randomised trials. | 3 PubMed-indexed studies cited below, including systematic reviews. |
| Suits | Men with early to moderate pattern hair loss who want to keep what they have and regain some density, who accept indefinite treatment and the small risk of sexual side effects; often combined with minoxidil and considered before or alongside transplantation. | Pattern hair loss in men and women who will use it indefinitely; people who cannot tolerate topical application; combined with finasteride or dutasteride in men and with other measures in women, under a doctor. | Early to moderate pattern hair loss with living, miniaturised follicles, in someone already on medical treatment prescribed by a doctor and willing to continue for months. |
| In one line | The side-effect debate is loud and the trial numbers are small; the right conversation is a frank one with a doctor, not a thread. | It works while you take it and only then; the tablet is more convenient than the foam, not more magical. | The needles make the medicine work better; they do not replace the diagnosis or the medicine. |
Risks
Reduced libido, erectile difficulty or ejaculatory change in a small minority, usually reversible; breast tenderness; mood change reported; persistent symptoms after stopping are reported but rare and disputed; lowered PSA, which matters for prostate screening.
In Singapore
Finasteride and dutasteride are prescription-only in Singapore and off-label for hair loss in the case of dutasteride; they are prescribed by doctors after assessment and may not be advertised to the public, which is why hair clinics describe 'oral medication' rather than naming them. This review names them generically. Many Singapore hair programmes combine them with minoxidil, and a transplant is planned on medically stabilised hair, not instead of it.
“The side-effect debate is loud and the trial numbers are small; the right conversation is a frank one with a doctor, not a thread.”
Questions
Does finasteride work for hair loss?
Finasteride or dutasteride?
What are the side effects of finasteride?
Does topical finasteride avoid side effects?
Can women take finasteride for hair loss?
Is finasteride available in Singapore?
Cite this review
Aesthetics International (2026). Finasteride and dutasteride for hair loss: does it work? Evidence, risks and verdict. https://aesthetics-international.org/treatments/finasteride-dutasteride/ (reviewed 6 October 2026).
Editorial, unpaid and independent of any manufacturer. Verdict: Established. See what works and what doesn't across all 153 reviews. Spotted an error or a newer study? Suggest a correction — changes are logged on the corrections page. Terms are defined in the glossary.
Where this review is used
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