learn Dutasteride
5-alpha reductase inhibitor that blocks both enzyme types, a stronger DHT blocker than finasteride
- Dutasteride: Correct Dosage and Administration The US label dose of dutasteride (for BPH) is 0.5 mg once daily; in Japan the approved hair-loss dose is 0.1 mg daily, increased to 0.5 mg if needed. Any dose or schedule for hair loss should be set by a prescriber.
- Will I notice changes in my body if I start taking dutasteride? Dutasteride lowers DHT, so labels and trials describe prostate shrinkage over 3-6 months and, off-label, slowed hair loss; the same sources list sexual side effects that may persist after stopping, breast and semen changes, rare allergic reactions, and an observational link to depression.
- Dutasteride: Why don't some doctors prescribe it if it's stronger than finasteride? Dutasteride is off-label for hair loss in the US, the EU and the UK, stays in the body for months after the last dose, and has less long-term data in hair loss than finasteride. Its US label also states that sexual side effects may persist after stopping, with dutasteride's role unknown, and in 2026 the UK regulator added a precautionary warning about depression and suicidal thoughts.
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