Norvasc vs Amlodipine: are they the same?
Norvasc is a commercial brand whose active ingredient is exactly Amlodipine. 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 — Norvasc contains Amlodipine as its active ingredient. Talking about "Norvasc" in clinical terms is the same as talking about Amlodipine at the dose strengths 2.5mg, 5mg, 10mg. The differences from the authorised generic are brand, manufacturer (Pfizer), excipients, tablet appearance and price — not the active molecule itself.
When Norvasc is used
ノルバスクは成人における本態性高血圧および慢性安定狭心症、血管攣縮性(プリンツメタル)狭心症の治療に承認されています。6歳以上の小児患者では高血圧に承認されています。ノルバスクは単独でもACE阻害薬、アンジオテンシン受容体拮抗薬、利尿薬、β遮断薬などの他の降圧薬との併用でも使用できます。国際ガイドラインによれば、カルシウム拮抗薬は高血圧における推奨される第一選択薬の一つです。
Mechanisms compared
Because they share the same active ingredient, the mechanism is identical: アムロジピンは血管平滑筋のL型カルシウムチャネルを選択的に遮断し、膜を介したカルシウム流入を低下させて末梢動脈の血管拡張を生じさせます。本薬は治療用量において、心収縮力や房室伝導への直接作用は比較的少ないとされています。その結果、全身血管抵抗および血圧が持続的に低下し、冠動脈灌流の改善が並行して得られ、抗狭心症効果を支えます。
Brand or generic — which to choose?
For most patients, authorised generics of Amlodipine are clinically equivalent substitutes for Norvasc 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 Norvasc the same as Amlodipine? ▾
Clinically yes — Norvasc is the brand and Amlodipine is its active ingredient. At equivalent doses (2.5mg, 5mg, 10mg) they produce the same effect. The difference is brand, manufacturer (Pfizer) and price.
Is generic Amlodipine as effective as Norvasc? ▾
Yes. Authorised generics of Amlodipine must demonstrate bioequivalence to the brand. The active substance is the same; average effect is the same. Price is usually substantially lower.
Why does Norvasc cost more than generic Amlodipine? ▾
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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