Objective: The aim of this study was to examine the use of complementary therapy in individuals with interstitial cystitis. Material and Methods: This study, which was carried out in a descriptive research design, was carried out with 80 female patients over 18 years of age with interstitial cystitis, who applied to the Urology Outpatient Clinic of a city hospital in Istanbul between January and July 2023. The data were collected by face-to-face (onsite) interview method using a form prepared by the researchers in line with the literature to determine the socio-demographic characteristics of the patients and their use of complementary therapy. Data were analyzed using SPSS 22 statistical software for Windows. Results are reported as mean ± SD. Ethics committee and institutional permission were obtained before starting the study. Results: When the characteristics of the individuals included in the study were examined; The mean age was 42.80±10.68 years, 60% did not have a chronic disease, 65% used any complementary treatment method, 43.2% used herbal treatment method, 50% did not receive complementary treatment. 55% received this information from the physician, 50% used complementary therapy to reduce their pain, 61.5% did not experience any side effects after using complementary therapy, 80.8% believed that complementary therapy was effective. It was determined that 53.8% of them did not share the complementary treatment methods they used with the physician or nurse. Conclusion: It was seen that the majority of individuals with interstitial cystitis used any complementary treatment, half of them did not get information before using the treatment, and more than half did not share the complementary treatment methods they used with the physician or nurse.