The use of the internet for buying and selling transactions is starting to be beneficial, including as an effort to support health services, because there is no need for physical interactions either with customers or prospective customers, causing the development of online medicines purchasing services This study aimed to examine the factors that influence people's intention to purchase medicines online The data in this study were collected through semi-structured in-depth interviews guided by the Theory of Planned Behavior to 18 respondents who bought medicines online through Halodoc at Viva Pharmacy in Denpasar City, then the data were analyzed using QSR Nvivo 12 Plus software This study found that the public's intention or interest in using the online drug-buying application through the Halodoc application is largely influenced by three factors, namely: Internal motivation formed from positive perceptions regarding online drug buying services on the Halodoc application, external motivation formed from the influence and perceptions of barriers to using online drug purchase services on the Halodoc application Positive perceptions of online drug buying services on the Halodoc application and strong influence from external parties form a strong intention for the public to use online drug buying services on the Halodoc application, on the contrary, the perception of increasing barriers will reduce people's intention to use drug buying services online on the Halodoc application