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Japan market screening · Therapeutic class
抗ヒスタミン剤 · Japan Standard Commodity Classification
10 molecules in this class are marketed in Japan across 46 products. 6 of those products are not shipping normally today — 13.0% 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 |
|---|---|---|---|---|
| Mequitazineメキタジン | 10 | 6 | — | |
| Clemastine Fumarateクレマスチンフマル酸塩 | 8 | 4 | 1 | |
| d-Chlorpheniramine Maleateｄ－クロルフェニラミンマレイン酸塩 | 8 | 5 | 1 | |
| Chlorpheniramine Maleateクロルフェニラミンマレイン酸塩 | 6 | 6 | 1 | |
| Promethazine Hydrochlorideプロメタジン塩酸塩 | 5 | 2 | 1 | |
| Cyproheptadine Hydrochloride Hydrateシプロヘプタジン塩酸塩水和物 | 3 | 1 | 1 | |
| Diphenhydramine Hydrochlorideジフェンヒドラミン塩酸塩 | 3 | 2 | — | |
| Alimemazine Tartrateアリメマジン酒石酸塩 | 1 | 1 | — | |
| Diphenhydramine Hydrochloride / Calcium Bromideジフェンヒドラミン塩酸塩・臭化カルシウム | 1 | 1 | 1 | |
| Promethazine Methylenedisalicylateプロメタジンメチレンジサリチル酸塩 | 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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