IM
uk/ˌaɪˈem/ us/ˌaɪˈem/
短信；即时消息（instant messaging的缩写）
abbreviation for instant messaging
medical specialized肌内的（intramuscular的缩写）
abbreviation for intramuscular
An IM injection is chosen when reasonably rapid systemic uptake of the drug is needed by the body. 当药物需要被身体很快吸收时，会选择肌肉注射。