Finasteride 1 mg is the FDA-approved oral DHT blocker for male pattern hair loss. Dutasteride suppresses more DHT and has a hair indication in some countries, but it is off-label for hair in the US and EU. Neither belongs in a pregnancy.
Both medicines lower dihydrotestosterone (DHT), the androgen that miniaturises follicles in people who are genetically sensitive to it. Finasteride mainly inhibits type II 5-alpha-reductase. Dutasteride inhibits type I and type II, so typical DHT suppression is greater. That biochemical gap is real; it does not by itself prove dutasteride is the right first prescription for every man. Oral finasteride 1 mg is FDA-approved for male androgenetic alopecia. Dutasteride 0.5 mg is commonly prescribed off-label for hair in the US and EU, and it has a hair-loss indication in Korea and Japan. Comparative trials often report larger hair-count changes on dutasteride, but sample size, dose, and who was enrolled still matter — and the side-effect conversation should be just as direct as the efficacy one.
Sexual side effects (libido, erection, ejaculate volume) are reported with both drugs, usually in a minority of users, and often ease after stopping. Reports of symptoms that linger are real enough to discuss and still debated in how common and how causal they are. Dutasteride stays in the body longer. Both can lower PSA readings, which matters for prostate screening as you age. Pregnancy warning: finasteride and dutasteride can harm a developing male fetus. Do not take them, and do not handle broken tablets, if you are pregnant or may become pregnant. This page is education, not a prescription. A clinician should match the drug to your sex, pregnancy plans, other medicines, and medical history. Sudden patchy, painful, or scarring loss is not a reason to swap DHT blockers — see a dermatologist.
よくある質問
Is dutasteride stronger than finasteride for hair?
It suppresses more DHT because it blocks both 5-alpha-reductase types, and some trials show larger hair-count changes. Stronger suppression is not automatically a better personal choice; side effects, how long the drug stays in tissue, and whether you even need that step belong with a prescriber.
Can I switch from finasteride to dutasteride without a doctor?
No. Dose, monitoring, and whether you are a candidate — including pregnancy risk in your household — are clinical decisions. Do not combine leftover pills or buy unregulated tablets online.
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