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BACKGROUND Introducing telemedicine in outpatient treatment may improve patient satisfaction and convenience. However, the optimal in-person visit interval for video-based telemedicine in patients with hypertension remains unreported in Japan. OBJECTIVE We determined the optimal in-person visit interval for video-based telemedicine in patients with hypertension. METHODS Design: This was a cluster randomized controlled noninferiority trial. Participants: The target sites were eight clinics in Japan that had a telemedicine system, and the target patients were individuals with essential hypertension. Among patients receiving video-based telemedicine, those who underwent in-person visits at 6-month intervals were included in the intervention group, and those who underwent in-person visits at 3-month intervals were included in the control group. Main Measures: The follow-up period of the participants was 6 months. The primary endpoint of the study was the change in systolic blood pressure, and the secondary endpoints were the rate of treatment continuation after 6 months, patient satisfaction, health economic evaluation, and safety evaluation. RESULTS Overall, 64 patients were enrolled. Their mean age was 54.5 ± 10.3 years, and 39 (60.9%) patients were males. For the primary endpoint, the estimated difference in the change in systolic blood pressure between the two groups was 1.18 (90% confidence interval: −3.68 to 6.04). Notably, the criteria for noninferiority were met. Patient satisfaction was higher in the intervention group than in the control group. Furthermore, the indirect costs indicated that lost productivity was significantly less in the intervention group than in the control group. Moreover, the treatment continuation rate did not differ between the intervention and control groups, and there were no adverse events in either group. CONCLUSIONS Blood pressure control status and safety did not differ between the intervention and control groups. In-person visits at 6-month intervals may cause a societal cost reduction and improve patient satisfaction during video-based telemedicine. CLINICALTRIAL UMIN000040953