Objective: Following the amendment of the Pharmaceutical and Medical Device Act in December 2019, continuous follow-up of patients during treatment has been mandated for pharmacists. The follow-up methods may involve contacting patients via telephone and social networking services (SNS). The SNS is advantageous over telephone, because patients can respond to the pharmacists at their convenience. Therefore, we developed a patient compliance instruction support system “FollowNavi” using LINE. We prepared a content of inhalation drugs used to treat bronchial asthma for assessment using FollowNavi and conducted questionnaire surveys among patients and pharmacists to validate its utility.Methods: FollowNavi was used from May1 to July 31, 2020, to follow up patients diagnosed with bronchial asthma for whom long-term control medicine (inhalation drugs) was prescribed for the first time or prescriptions were changed from other inhalation drugs. Subsequently, when the patients revisited the pharmacy, we conducted a questionnaire survey regarding the usability of FollowNavi. We also conducted a questionnaire survey among the pharmacists.Results: Seven and five responses were received from patients who were followed up via FollowNavi and pharmacists who used FollowNavi, respectively. Furthermore, 28.6% of the patients responded “I could solve the problem through LINE” and 71.4% responded “I did not have anything in particular that I could not understand.” As for pharmacists, 60.0% responded that they could obtain sufficient information from the patients through FollowNavi.Conclusion: The results suggest that follow-up after providing inhalation instructions using the inhalation drug content of FollowNavi may be useful for both patients and pharmacists.