Controlled Drugs Act Article 21

When selling controlled drugs, the names of purchasers and their institutions, organizations, the person in charge, the registration numbers, purchased amount, and dates shall be recorded in detailed records and shall be kept together with the receipt containing the purchasers’ signature.
中文原文 管制藥品管理條例第21條
管制藥品之販賣,應將購買人及其機構、團體之名稱、負責人姓名、管制藥品登記證字號、所購品量及販賣日期,詳實登錄簿冊,連同購買人簽名之單據保存之。

English translation for reference only; the Chinese text prevails. Not legal advice.