The present study aims to describe the efficacy and safety of onabotulinum toxin A (BonT-A) with evaluation of treatment satisfaction and impact on quality of life in chronic migraine (CM) patients in real life. Methods: This study was conducted in CM patients who were treated with BoNT-A with 12 months of follow-up. Data about outcome, adverse events, and patients' pre-and post-treatment status including health-related quality of life data were analyzed. Health-related quality of life scores were measured at baseline and months 6 and 12 after the beginning of BoNT-A administration. Results: Of 42 enrolled patients, 30 were included in the analysis. At 12 months, all patients showed a reduction in number of headaches and analgesic use per month and none reported adverse events. After BoNT-A supplementation, health-related quality-of-life scores improved significantly. There was a direct association between healthrelated quality of life with reduction of headache days at the end of study. Conclusion: This study confirms that BoNT-A treatment is effective on CM and improves the functional well-being and quality of life of patients.