Sankar K and Harinika G 2021. An observational study on safety profile of ofloxacin and levofloxacin in treatment of acute exacerbation of chronic bronchitis. International Journal of Research in Pharmacology & Pharmacotherapeutics. 8, 2 (Apr. 2021), 131-136. DOI:https://doi.org/10.61096/ijrpp.v8.iss2.2019.131-136.