Abstract:
The following paper demonstrates the results of the scientific study of toxicity effect of five antibiotics as
amoxicillin, clarithromycin, azithromycin, sulfamethoxazole and oxytetracycline hydrochloride to the growth
of common duckweed Lemna minor. It was defined that the half maximal effective concentration of five previously
mentioned antibiotics was equal to 27.8, 15.29, 28.77, 3.67 and 13.51 mg/L respectively. Overall, the
results of the study showed that the duckweed was sensitive to all selected compounds, however
sulfamethoxazole was the most toxic to these species. The present study is significant, as currently people
consume antibiotics in huge amount. Their occurrence on the surface was found around the world and their
effect to the environment and living organisms are not fully studied yet. The recent studies show that in most
cases they have adverse effect to the aquatic microorganisms
