According to the source, the volume ratio is defined as the proportion of generics that take as denominators the "original drugs for which there are generic alternatives" and "generic drugs".
The source does not provide an exact publication date. The date given here is the day of data access.
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Share of the volume of generics in the prescription drug market Japan 2013-2024
The volume share of generics in the Japanese prescription drugs market stood at around ** percent as of 2024. This was an increase from around ***percent in 2015.
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JPWA. (November 6, 2025). Share of the volume of generics in the prescription drug market in Japan from 2013 to 2024 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 23, 2026, from /statistics/799622/japan-generics-market-volume-share/
JPWA. "Share of the volume of generics in the prescription drug market in Japan from 2013 to 2024." Chart. November 6, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 23, 2026. /statistics/799622/japan-generics-market-volume-share/
JPWA. (2025). Share of the volume of generics in the prescription drug market in Japan from 2013 to 2024. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 23, 2026. /statistics/799622/japan-generics-market-volume-share/
JPWA. "Share of The Volume of Generics in The Prescription Drug Market in Japan from 2013 to 2024." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 6 Nov 2025, /statistics/799622/japan-generics-market-volume-share/
JPWA, Share of the volume of generics in the prescription drug market in Japan from 2013 to 2024 ÌÇÐÄÆƽâ°æ, /statistics/799622/japan-generics-market-volume-share/ (last visited July 23, 2026)
Share of the volume of generics in the prescription drug market in Japan from 2013 to 2024 [Graph], JPWA, November 6, 2025. [Online]. Available: /statistics/799622/japan-generics-market-volume-share/
