Pharmaceutical Affairs Act Enforcement Rules Article 18

A pharmacist, assistant pharmacist, or Chinese medicine doctor employed by a seller of drugs in accordance with Article 28 of the Act, or a pharmacist or an assistant pharmacist that personally manages the business of a pharmacy in accordance with Article 19 of the Act, shall be personally present to conduct business at the firm's place of business. When that person is not present at the place of business, a sign clearly indicating that fact shall be hung on the door.
中文原文 藥事法施行細則第18條
藥品販賣業者依本法第二十八條規定聘用之藥師、藥劑生或中醫師,或本法第十九條規定親自主持藥局業務之藥師、藥劑生,均應親自在營業場所執行業務,其不在場時,應於門口懸掛明顯標示。

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