Microzide vs Hydrochlorothiazide: are they the same?
Microzide is a commercial brand whose active ingredient is exactly Hydrochlorothiazide. 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 — Microzide contains Hydrochlorothiazide as its active ingredient. Talking about "Microzide" in clinical terms is the same as talking about Hydrochlorothiazide at the dose strengths 12.5mg, 25mg, 50mg. The differences from the authorised generic are brand, manufacturer (Various generics), excipients, tablet appearance and price — not the active molecule itself.
When Microzide is used
マイクロザイドは高血圧(単独または併用)、心不全、肝硬変、ネフローゼ症候群による浮腫、一部の腎カルシウム代謝障害に承認されています。現行の高血圧ガイドラインによれば、HCTZはACE阻害薬、ARB、カルシウム拮抗薬とともに第一選択の4クラスのうちの一つで、特に高齢者および併用療法において有用です。
Mechanisms compared
Because they share the same active ingredient, the mechanism is identical: ヒドロクロロチアジドは腎臓の遠位曲尿細管のNa+/Cl-共輸送体を阻害し、ナトリウム再吸収を低下させて中等度の利尿を引き起こします。降圧効果は1-2週間で発現し、利尿作用および直接的血管拡張作用の双方によって持続します。利尿作用はフロセミドのようなループ利尿薬と比べて中等度であり、急性の体液除去よりも慢性の血圧管理に適しています。
Brand or generic — which to choose?
For most patients, authorised generics of Hydrochlorothiazide are clinically equivalent substitutes for Microzide 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 Microzide the same as Hydrochlorothiazide? ▾
Clinically yes — Microzide is the brand and Hydrochlorothiazide is its active ingredient. At equivalent doses (12.5mg, 25mg, 50mg) they produce the same effect. The difference is brand, manufacturer (Various generics) and price.
Is generic Hydrochlorothiazide as effective as Microzide? ▾
Yes. Authorised generics of Hydrochlorothiazide must demonstrate bioequivalence to the brand. The active substance is the same; average effect is the same. Price is usually substantially lower.
Why does Microzide cost more than generic Hydrochlorothiazide? ▾
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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