"Pills" was the oldest and longest form of drug and drug consumption. Their Chinese name for "pills" changed over time. Pills were first designated bu the term "dan" (丹) in 1914. Since 1924, they were refered to as "wan" (丸).
References (France): https://fr.slideshare.net/busante54/histoire-des-comprims-pharmaceutiques-en-france-14151521
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