Diflucan vs Fluconazole: are they the same?
Diflucan is a commercial brand whose active ingredient is exactly Fluconazole. 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 — Diflucan contains Fluconazole as its active ingredient. Talking about "Diflucan" in clinical terms is the same as talking about Fluconazole at the dose strengths 50mg, 100mg, 150mg, 200mg. The differences from the authorised generic are brand, manufacturer (Pfizer), excipients, tablet appearance and price — not the active molecule itself.
When Diflucan is used
ディフルカンは、成人および小児における外陰膣・口腔咽頭・食道カンジダ症、尿路カンジダ症、腹膜炎および感受性菌種による他の侵襲性カンジダ症(カンジダ血症を含む)、クリプトコックス髄膜炎(アムホテリシンBおよびフルシトシンによる導入後、フルコナゾールによる地固めおよび維持)の治療に承認されています。化学療法または移植を受ける免疫不全患者の予防にも用いられます。
Mechanisms compared
Because they share the same active ingredient, the mechanism is identical: フルコナゾールはトリアゾール系抗真菌薬で、シトクロムP450依存性酵素ラノステロール14αデメチラーゼを阻害し、ラノステロールからのエルゴステロール合成を遮断します。エルゴステロールは真菌細胞膜の必須成分であるため、その枯渇により膜機能障害と増殖抑制が生じます。多くのカンジダ属(C. glabrataおよびC. kruseiでは感受性低下)およびクリプトコックス・ネオフォルマンスに対し活性を有します。
Brand or generic — which to choose?
For most patients, authorised generics of Fluconazole are clinically equivalent substitutes for Diflucan 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 Diflucan the same as Fluconazole? ▾
Clinically yes — Diflucan is the brand and Fluconazole is its active ingredient. At equivalent doses (50mg, 100mg, 150mg, 200mg) they produce the same effect. The difference is brand, manufacturer (Pfizer) and price.
Is generic Fluconazole as effective as Diflucan? ▾
Yes. Authorised generics of Fluconazole must demonstrate bioequivalence to the brand. The active substance is the same; average effect is the same. Price is usually substantially lower.
Why does Diflucan cost more than generic Fluconazole? ▾
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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