Topical dutasteride in London — stronger than finasteride, applied to the scalp
Topical dutasteride is compounded, unlicensed, and quietly one of the most effective hair-loss treatments available in London.
Dr. Theo Marwick
Hair Restoration Surgeon · Marylebone
In short
- Dutasteride is 3× more potent than finasteride at blocking DHT.
- Topical application reduces systemic absorption vs oral.
- Compounded in London by 4–5 specialist pharmacies.
- Cost: £45–£90/month; requires specialist prescription.
Dutasteride is a dual 5-alpha reductase inhibitor — it blocks both type 1 and type 2 enzymes, whereas finasteride blocks mainly type 2. That extra coverage translates to 20–30% more scalp regrowth in head-to-head trials.
Why topical, not oral
Oral dutasteride works but has a long half-life (5 weeks) — side effects, if they occur, persist. Topical delivery achieves the same follicle-level DHT reduction with a fraction of the systemic exposure. Not zero systemic — some absorption is inevitable — but meaningfully lower.
London compounding
A handful of specialist pharmacies (Roseway Labs, Skin + Me and select W1 compounders) prepare topical dutasteride 0.1–0.25% in a minoxidil or standalone base. Requires prescription from a specialist trichologist or dermatologist.
Who it's for
- Finasteride 'non-responders' — no improvement at 12 months
- Aggressive early-onset MPB with strong genetic loading
- Patients seeking maximal medical therapy pre-transplant
- Post-transplant maintenance protocols
Frequently asked
Common questions
Are side effects the same as oral?+
Lower rates but not zero. Sexual side effects reported in ~2–3% vs ~5% oral.
Can women use it?+
Not if planning pregnancy — teratogenic. Post-menopausal off-label use in some cases.
How long to see results?+
6–12 months, similar to finasteride.
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