Dutasteride vs Finasteride

The Dose Guy’s verdict

Oct 27, 2026
8 sources

Finasteride first, and topical finasteride if you can. Dutasteride is the stronger drug and beat finasteride head to head on hair counts, but the deeper DHT cut that buys the extra hair also reaches the neurosteroids your brain runs on. So dutasteride is the step up for when a full year of finasteride has fallen short, or the start if your loss is fast and aggressive. Never run the two together; switching is a straight swap.

Which would I take?Finasteride first, dutasteride if it falls short.

How they differ

Same job, different depth. Both block 5-alpha-reductase, the enzyme that turns testosterone into DHT, the hormone shrinking your follicles. Finasteride blocks the type 2 enzyme. Dutasteride blocks type 1 and type 2, so it cuts DHT deeper, and that is where its extra hair comes from. The catch rides the same pathway: those enzymes also make allopregnanolone and other neurosteroids your brain uses to buffer mood and anxiety, and deeper suppression takes more of those too. More hair for more systemic reach is the whole decision.

Finasteride also has an exit dutasteride lacks: a topical version with phase 3 data that keeps most of the drug out of your blood. Topical dutasteride is in trials, not on shelves you can trust yet.

The difference you live with is how long each one stays. Finasteride clears in days, so a missed dose is nothing and a side effect starts fading soon after you stop. Dutasteride keeps working for weeks after the last capsule and takes months to clear fully. That makes skipped days forgiving and the three-times-a-week schedule possible, but if a side effect shows up, it does not leave when you stop. Blood services make you wait about a month after finasteride and about six after dutasteride. If you landed here for an enlarged prostate, both are standard there, finasteride at 5 mg rather than the hair dose, and the same trade holds: dutasteride cuts deeper, finasteride reaches less.

What the research shows

These two have been tested head to head, which is rare on this shelf, and dutasteride won on hair:

In 917 men, dutasteride 0.5 mg daily increased hair count more than finasteride 1 mg daily at 24 weeks (p=0.003), and beat it on hair width too (p=0.004).JAAD 2014 · dose-ranging RCT · n=917

In the same trial, the number and severity of adverse events were similar across the dutasteride, finasteride, and placebo groups.JAAD 2014 · dose-ranging RCT · n=917

Dutasteride 0.2 mg daily was as effective as 0.5 mg daily across all efficacy endpoints at 24 weeks. Hair count rose 21.53 from baseline on 0.2 mg versus 5.96 on placebo (p=0.0072).2025 · phase 3 · n=139

Topical finasteride increased hair count by 20.2 hairs versus 6.7 with placebo at 24 weeks, numerically similar to oral finasteride, while peak plasma concentration ran more than 100 times lower.JEADV 2022 · phase 3 · n=458

In 2.2 million men, dutasteride use was associated with depression at HR 1.68 (95% CI 1.43 to 1.96), and the association stayed constant over time.JAMA Netw Open 2022 · Swedish register · n=2,236,876

The head-to-head trial ran 24 weeks, too short to catch a slow mood signal. The register is where that shows, and a register shows association, not cause. That is why dutasteride waits its turn.

How people run them

Start on finasteride: 1 mg a day by mouth, or topical finasteride daily, and give it a full year with photos, because hair cycles are slow. If the year falls short, switch the next morning: no taper, no overlap. Take dutasteride at 0.2 mg or 0.5 mg; the low dose matched the standard in a phase 3 trial, so starting low is not underdosing. Once you are settled, some people drop to 0.5 mg three times a week to lower the systemic load, and dutasteride’s long stay is what makes that work. Starting fresh with fast, aggressive loss is the one case for going straight to dutasteride, and then start at 0.2 mg.

Going back the other way, because of side effects or because you want the topical route, is the same next-day swap. Dutasteride keeps working, and keeps any side effect around, long after the last capsule, so give a side effect time to fade before you blame finasteride for it.

Do not stack them. They hit the same enzyme, so two pills is just a bigger dose of the same trade. Whichever you run, pair it with minoxidil, which is where the regrowth push comes from. A partner who is or could be pregnant should not handle broken finasteride tablets or a leaking dutasteride capsule.

Finasteride, topicaldailySame scalp benefit, far less in your blood. The better start for most.

Finasteride, oral1 mg/dayOne pill, any time of day.

Dutasteride0.2–0.5 mg/dayThe low dose matched the standard in phase 3.

Spaced out0.5 mg 3x/wkDutasteride lingers long enough that skipping days works.

Stepping upnext-day swapAfter a full year of finasteride falls short. No taper, no overlap.

Stepping backnext-day swapDutasteride takes months to clear, so judge finasteride after it does.

The stack+ minoxidilEither one, never both, plus the growth push.

Side effects, side by side

Same family of side effects; dutasteride reaches further and stays longer:

commonLower libido, softer erections, or less ejaculate on both, in a minority. The head-to-head trial saw similar adverse events overall; with the deeper cut, I expect dutasteride to run a little higher in real life. Topical finasteride lowers the exposure.

monitorMood changes, anxiety, and fog on dutasteride. It suppresses neurosteroids your brain relies on, A class-level meta-analysis found no overall link with depression, but the Swedish register found a dutasteride signal that did not fade. If your mood shifts, stop, and know it takes months to clear fully.

monitorSmall mood and anxiety signals for finasteride in population studies. Rare, worth noticing if they show.

monitorSemen volume and motility drop the longer you take dutasteride, and recover after stopping. If you are trying for kids, factor it in.

anecdotalWatery semen on finasteride, reported more often than trial rates suggest. Harmless and reversible.

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