A drug information monitoring apparatus (11) and a drug information monitoring type injection apparatus (1). The drug information monitoring apparatus (11) is used for detecting an injection dose of an injection pen (12) containing a drug, an adjustment knob (121) used for determining the injection dose being provided at one end of the injection pen (12). The drug information monitoring apparatus (11) comprises a housing (112), a rotary encoder (113) used for converting rotation information of the adjustment knob (121) to drug injection dose information, and a control assembly (114). The rotary encoder (113) comprises an encoder body (1132) and a rotary block (1131) rotationally connected to the encoder body (1132), the encoder body (1132) and the control assembly (114) are electrically connected and both fixed at the adjustment knob (121), the housing (112) covers the exteriors of the encoder body (1132) and the control assembly (114), a button (111) is provided at one end of the housing (112), and the rotary block (1131) is fixedly connected to the button (111). The encoder body (1132) of the rotary encoder (113) in the drug information monitoring apparatus (11) can rotate along with the adjustment knob (121)； during injection, the number of turns of rotation is recorded and converted to drug information, and the drug information is stored； and data collection errors are small, and precision requirements on use and assembly are low.Un appareil de surveillance d'informations de médicament (11) et un appareil du type à injection de surveillance d'informations de médicament (1) sont décrits. L'appareil de surveillance d'informations de médicament (11) est utilisé pour détecter une dose d'injection d'un stylo d'injection (12) contenant un médicament, un bouton de réglage (121) utilisé pour déterminer la dose d'injection étant prévu au niveau d'une extrémité du stylo d'injection (12). L'appareil de surveillance d'informations de médicament (11) comprend un boîtier (112
