Prozac vs Fluoxetine: are they the same?
Prozac is a commercial brand whose active ingredient is exactly Fluoxetine. 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 — Prozac contains Fluoxetine as its active ingredient. Talking about "Prozac" in clinical terms is the same as talking about Fluoxetine at the dose strengths 10mg, 20mg, 40mg. The differences from the authorised generic are brand, manufacturer (Eli Lilly), excipients, tablet appearance and price — not the active molecule itself.
When Prozac is used
プロザックは大うつ病性障害(成人および8歳以上の小児)、強迫性障害(7歳以上の小児)、神経性過食症、パニック障害、月経前不快気分障害に承認されています。小児うつ病に対するロバストな小児エビデンス基盤とFDA小児承認を有する唯一のSSRIです。サラフェムブランドは同じ分子をPMDD向けに特化して販売しています。
Mechanisms compared
Because they share the same active ingredient, the mechanism is identical: フルオキセチンはセロトニン再取り込みトランスポーターを選択的に阻害し、シナプスのセロトニン利用率を高めます。薬理学的に活性な代謝物ノルフルオキセチンは作用持続時間を大幅に延長します。フルオキセチンはあらゆるSSRIの中で最も長い半減期を有し(親化合物で1-4日、ノルフルオキセチンで7-15日)、一部の剤形では1日1回または週1回投与を可能にし、短半減期SSRIに影響する中止症候群をほぼ排除します。
Brand or generic — which to choose?
For most patients, authorised generics of Fluoxetine are clinically equivalent substitutes for Prozac 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 Prozac the same as Fluoxetine? ▾
Clinically yes — Prozac is the brand and Fluoxetine is its active ingredient. At equivalent doses (10mg, 20mg, 40mg) they produce the same effect. The difference is brand, manufacturer (Eli Lilly) and price.
Is generic Fluoxetine as effective as Prozac? ▾
Yes. Authorised generics of Fluoxetine must demonstrate bioequivalence to the brand. The active substance is the same; average effect is the same. Price is usually substantially lower.
Why does Prozac cost more than generic Fluoxetine? ▾
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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