What is the difference between finasteride and dutasteride?Updated 17 hours ago

The Mechanism

Hair loss in pattern alopecia is driven by DHT binding to androgen receptors at the follicle. DHT is created when an enzyme called 5-alpha reductase converts testosterone. That enzyme exists in two forms: type I and type II.

• Finasteride blocks only the type II form.
• Dutasteride blocks both type I and type II.

Blocking both pathways is why dutasteride suppresses DHT more completely.

Finasteride

• First-line oral treatment for pattern hair loss
• Reduces serum DHT by ~70%
• Decades of safety and efficacy data
• Standard hair-loss dose: 1mg daily
• Available at Adegen as Oral Finasteride 1mg, and as a topical add-on inside A5F / A15F

Real-world data on finasteride is some of the strongest in the entire field. PCPT, the largest independent long-term trial, tracked 17,313 men for seven years at five times the standard hair-loss dose and found minimal impact on sexual function scores. PLESS at years 2–4 showed identical 7% sexual side-effect rates in the finasteride and placebo groups.

Dutasteride

• More potent DHT suppression: ~90%
• Originally developed for benign prostatic hyperplasia, now widely used off-label for pattern hair loss
• Standard hair-loss dose: 0.5mg daily
• Available at Adegen as Oral Dutasteride 0.5mg, and as a topical add-on inside A5D / A15D
• Often the right call for advanced or rapidly progressing loss, or for people who didn't get the response they wanted from finasteride

A meta-analysis of 15 randomized controlled trials found dutasteride's sexual dysfunction risk was not statistically significant. Real-world surveillance of more than 700 men taking dutasteride for hair loss found decreased libido in 1.3% and impotence in 1.0%.

Which One Is Better?

For most people, dutasteride blocks more DHT, which can translate into a stronger regrowth response. But "better" depends on the person:

• If you're early in treatment or have moderate loss, finasteride is often the first call.
• If you're further along, progressing fast, or have plateaued on finasteride, dutasteride may be a better fit.
• Your medical history, age, and goals all factor in.

This is exactly the call HairIQ™ and your telehealth physician are designed to make together.

Topical vs Oral

Both finasteride and dutasteride can be delivered topically inside Adegen's A5F/A15F and A5D/A15D variants. Topical delivery still produces meaningful systemic absorption (typically 30–50% serum DHT reduction for topical finasteride), so the same physician review applies.