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Japan market screening · Therapeutic class
抗てんかん剤 · Japan Standard Commodity Classification
27 molecules in this class are marketed in Japan across 243 products. 12 of those products are not shipping normally today — 4.9% of the class. Supply status is reported to the Ministry of Health, Labour and Welfare and updated daily.
Ordered by how many products compete. Constrained means limited supply or supply suspended; supply suspended does not mean discontinued.
| Molecule | Products | Companies | Constrained | Supply mix |
|---|---|---|---|---|
| Levetiracetamレベチラセタム | 42 | 14 | 3 | |
| Zonisamideゾニサミド | 37 | 16 | — | |
| Lacosamideラコサミド | 36 | 11 | — | |
| Sodium Valproateバルプロ酸ナトリウム | 25 | 7 | 1 | |
| Lamotrigineラモトリギン | 24 | 6 | 1 | |
| Clonazepamクロナゼパム | 10 | 2 | — | |
| Carbamazepineカルバマゼピン | 9 | 3 | 3 | |
| Midazolamミダゾラム | 9 | 5 | 4 | |
| Topiramateトピラマート | 7 | 2 | — | |
| Perampanelペランパネル | 6 | 2 | — | |
| Phenytoinフェニトイン | 5 | 2 | — | |
| Gabapentinガバペンチン | 4 | 1 | — | |
| Perampanel Hydrateペランパネル水和物 | 4 | 1 | — | |
| Brivaracetamブリーバラセタム | 3 | 1 | — | |
| Clobazamクロバザム | 3 | 1 | — | |
| Stiripentolスチリペントール | 3 | 1 | — | |
| Acetylpheneturideアセチルフェネトライド | 2 | 1 | — | |
| Ethosuximideエトスクシミド | 2 | 2 | — | |
| Primidoneプリミドン | 2 | 1 | — | |
| Rufinamideルフィナミド | 2 | 1 | — | |
| Sultiameスルチアム | 2 | 1 | — | |
| Ethotoinエトトイン | 1 | 1 | — | |
| Fenfluramine Hydrochlorideフェンフルラミン塩酸塩 | 1 | 1 | — | |
| Fosphenytoin Sodium Hydrateホスフェニトインナトリウム水和物 | 1 | 1 | — | |
| Phenytoin / Phenobarbitalフェニトイン・フェノバルビタール | 1 | 1 | — | |
| Trimethadioneトリメタジオン | 1 | 1 | — | |
| Vigabatrinビガバトリン | 1 | 1 | — |
Products counts every marketed product across all strengths and forms, not companies. Companies is the number of companies marketing that molecule; the same company may appear under several molecules, so the column does not add up to a class total. Market size sits on each molecule's own page, valued at national price rather than transaction price. Figures are as at 2026-08-28.
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