Propecia vs Finasteride: are they the same?
Propecia is a commercial brand whose active ingredient is exactly Finasteride. This page explains what that means in practice: where they differ (brand, manufacturer, price, available strengths), why they are clinically equivalent, and when the brand or an authorised generic is the better choice.
Are they the same?
Yes — Propecia contains Finasteride as its active ingredient. Talking about "Propecia" in clinical terms is the same as talking about Finasteride at the dose strengths 1mg. The differences from the authorised generic are brand, manufacturer (Merck), excipients, tablet appearance and price — not the active molecule itself.
When Propecia is used
プロペシアは18歳から41歳の男性の男性型脱毛症(アンドロゲン性脱毛症)の治療に承認されています。女性、小児患者、またはこの年齢範囲外の男性には承認されていません。臨床ガイドラインによれば、治療は脱毛の初期から中期段階で最も効果的であり、頭頂部で前頭部より良く作用します。生存可能な毛包が残っていない確立された禿頭症は薬物単独では反応しません。
Mechanisms compared
Because they share the same active ingredient, the mechanism is identical: テストステロンから5α-還元酵素により産生されるDHTは、遺伝的に感受性のある男性において頭皮の毛包の小型化を引き起こし、毛包が細く軟らかい毛のみを産生するまで成長期(アナゲン期)を徐々に短縮させます。フィナステリドは5α-還元酵素II型を阻害することでこのプロセスを阻害し、頭皮のDHT曝露を減少させます。継続的な治療により、小型化したが依然生存可能な毛包は再びより太い毛を産生でき、脱毛の進行が遅延します。臨床試験によれば、目に見える改…
Brand or generic — which to choose?
For most patients, authorised generics of Finasteride are clinically equivalent substitutes for Propecia and typically cost substantially less. The practical differences are manufacturer, excipients (rarely matters except in specific sensitivities), tablet appearance and price. The brand is preferred by some patients for personal reasons or insurance coverage; the generic is the default when cost matters.
よくある質問
Is Propecia the same as Finasteride? ▾
Clinically yes — Propecia is the brand and Finasteride is its active ingredient. At equivalent doses (1mg) they produce the same effect. The difference is brand, manufacturer (Merck) and price.
Is generic Finasteride as effective as Propecia? ▾
Yes. Authorised generics of Finasteride must demonstrate bioequivalence to the brand. The active substance is the same; average effect is the same. Price is usually substantially lower.
Why does Propecia cost more than generic Finasteride? ▾
The price difference reflects originator development costs, brand recognition and competition among generic manufacturers. The molecule is identical; the cost is not.
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