Wellbutrin vs Bupropion: are they the same?
Wellbutrin is a commercial brand whose active ingredient is exactly Bupropion. 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 — Wellbutrin contains Bupropion as its active ingredient. Talking about "Wellbutrin" in clinical terms is the same as talking about Bupropion at the dose strengths 75mg, 100mg, 150mg, 300mg. The differences from the authorised generic are brand, manufacturer (GlaxoSmithKline), excipients, tablet appearance and price — not the active molecule itself.
When Wellbutrin is used
ウェルブトリンは大うつ病性障害および季節性情動障害の再発予防(ウェルブトリンXL)に承認されています。同じ有効成分が禁煙補助薬としてザイバンに承認されています。適応外使用には注意欠如・多動性障害(ADHD)の補助療法、抗うつ薬誘発性性機能障害(性的副作用緩和のためSSRIと併用)、専門医監督下の選択された双極性うつ病が含まれます。
Mechanisms compared
Because they share the same active ingredient, the mechanism is identical: ウェルブトリンはノルエピネフリンとドーパミンの再取り込みを阻害し、セロトニンへの効果ははるかに弱いです。ドーパミン作動性成分はSSRIとの違いであり、その賦活プロファイル、性機能障害発生率の低さ、中立から体重減少効果に寄与します。抗うつ効果の発現は他の抗うつ薬と同様で、2週間以内に部分反応、4~6週間でより完全な反応が現れます。エネルギーと意欲はしばしば気分より先に改善します。
Brand or generic — which to choose?
For most patients, authorised generics of Bupropion are clinically equivalent substitutes for Wellbutrin 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 Wellbutrin the same as Bupropion? ▾
Clinically yes — Wellbutrin is the brand and Bupropion is its active ingredient. At equivalent doses (75mg, 100mg, 150mg, 300mg) they produce the same effect. The difference is brand, manufacturer (GlaxoSmithKline) and price.
Is generic Bupropion as effective as Wellbutrin? ▾
Yes. Authorised generics of Bupropion must demonstrate bioequivalence to the brand. The active substance is the same; average effect is the same. Price is usually substantially lower.
Why does Wellbutrin cost more than generic Bupropion? ▾
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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