DOSEGUY

Dutasteride

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Also seen as: Avodart, dut

The Dose Guy’s verdict
Sep 1, 2026
4 sources

Dutasteride is the strongest DHT blocker on the shelf, and head-to-head it beats finasteride on hair counts. Reach for it when finasteride is not enough, not instead of trying finasteride first. The deeper DHT suppression that makes it more effective also reaches the neurosteroids your brain relies on, and that tradeoff deserves respect.

Would I take it?Caution, second-line for good reason.

What it is

A dual 5-alpha-reductase inhibitor, blocking both type 1 and type 2 enzymes where finasteride only hits type 2. That wider coverage cuts DHT harder and deeper than finasteride can. The extra suppression is why dutasteride grows more hair, and also why it carries more systemic weight: the same pathway that produces DHT also feeds allopregnanolone and other neurosteroids the brain uses for mood regulation and anxiety buffering. Suppressing DHT more completely means suppressing those too, and that is the honest reason dutasteride sits behind finasteride in line.

Dutasteride lingers for weeks, not hours, which changes how you can dose it and how long it takes to clear if you stop.

What the research shows

Head-to-head data against finasteride exists, which is more than most compounds on this shelf can claim:

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
A network meta-analysis of 33 studies ranked oral dutasteride 0.5 mg daily as the most effective evaluated monotherapy for male pattern hair loss.NMA 2025 · 33 studies · 19 comparators
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
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

Realistic protocols

Dutasteride belongs in the conversation after finasteride has had its shot and fallen short, not as the opening move. If you are switching from finasteride, the transition is simple: swap the pill. If you are starting fresh because your loss is aggressive, start at the lower dose and see.

The 0.2 mg dose matched 0.5 mg in a phase 3 trial, so starting low is not underdosing. Because dutasteride clears so slowly, intermittent dosing works: early data suggests three times a week can hold meaningful hair counts. Taking it every other day or three times weekly is a real strategy for managing the systemic load.

Topical dutasteride is in trials, with early phase 2 data showing dose-dependent hair growth. Worth watching, but not widely available yet. Stack with minoxidil for the same reason you would on finasteride: one blocks the cause, the other pushes regrowth.

You cannot donate blood while on dutasteride, and the drug lingers long enough that most blood services will not accept you for months after stopping. If you donate regularly, factor that in before starting.

Standard0.5 mg/dayOral, daily. The established dose.
Low dose0.2 mg/dayMatched 0.5 mg in a phase 3 trial. A real option, not underdosing.
Intermittent0.5 mg 3x/wkLingers long enough that skipping days works. Lowers systemic exposure.
The stack+ minoxidilSame pairing logic as finasteride. Block loss, push growth.

Side effects

Similar territory to finasteride, with more systemic reach from the deeper suppression:

commonSexual side effects in the same family as finasteride: reduced libido, erectile changes, lower ejaculate volume. The deeper DHT cut means the real-world rate may run slightly higher.
monitorMood and cognition changes. Dutasteride suppresses allopregnanolone and other neurosteroids the brain uses. A class-level meta-analysis found no significant association with depression overall, but the Swedish register flagged a persistent dutasteride-specific signal. If mood shifts, take it seriously and stop.
monitorSemen quality declines with longer use. Motility and volume drop, but recover after stopping.
anecdotalFatigue and mental fog reported by a minority. Hard to separate from the neurosteroid signal, but consistent enough to note.

Where to buy

PCT.zone–
$2.36 / 0.5mg vial$4.72/mg
✓ verified Sep 12
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