The course of bipolar disorder (BD) is sensitive to factors that may disrupt biological and social rhythms. It is important for patients diagnosed with BD to continue their follow-up and treatment during the pandemic due to personal and social effects. This study aimed to evaluate the disease course and treatment compliance of individuals diagnosed with BD during the pandemic. A total of 267 patients with BD were included in the study. The scales were applied by phone calls. A sociodemographic data form was filled out during the phone interviews. Diagnostic criteria for hypomanic, manic, and depressive episodes in DSM-5 were questioned and recorded through the created form. During the first of the pandemic, a total of 72 (27.0%) patients had a mood episode, of which 56 (21.0%) were manic/hypomanic episodes and 16 (6.0%) depressive episodes. Also, 54.7% of the patients were able to obtain their medications thanks to the extended medication reports. Being unable to use their medications regularly, having a seasonal pattern of disease, and using an increased number of psychotropics were significant predictors of a new episode. While 74.5% of the patients wanted to talk to their psychiatrists online, only 1.1% could reach the psychiatrist online. The effects of the COVID-19 pandemic are particularly evident in patients with a seasonal pattern. Telepsychiatry practices should be actively included in clinical practice, and government policies developed for treatment compliance seem important.