Objective:The aim was to assess the eff ect of scaling and root planing (SRP) on clinical periodontal parameters and glycemic levels in prediabetic patients. Methods: Fifty prediabetic patients with periodontal disease were included. Demographic data (age, gender, education status, duration of prediabetes, type of treatment adopted for prediabetes management, and oral hygiene maintenance protocols) were recorded using a questionnaire. Patients were randomly divided into two groups (25 patients/group). In Group 1, SRP alone was performed, in Group 2, SRP + oral doxycycline (100 mg) administration. In both groups, fasting blood glucose (FBG) levels and periodontal parameters (plaque index [PI], bleeding on probing [BOP], and probing depth [PD]) were assessed at baseline and after 6 months. Statistical analysis was performed using one-way analysis of variance. Results: Age, gender, and duration and treatment of prediabetes were comparable among patients in Groups 1 and 2. PI, BOP, and PD signifi cantly reduced in both groups than baseline values. Reduction in periodontal parameters among Groups 1 and 2 were comparable. There was no signifi cant reduction in FBG levels among patients in Groups 1 and 2 after 6 months of SRP. Conclusion: SRP was eff ective in reducing periodontal infl ammation in prediabetic patients. FBG levels did not show any signifi cant diff erence after SRP in both groups.