This paper addresses the issue of antibacterial drugs, estrogens and cytostatic drugs’ presence in
surface waters and their influence on animals. The ecotoxicity and the impact of three active compounds: ciprofloxacin, 17α-ethinylestradiol and 5-fluorouracil on protozoa, crustaceans and fish were examined. Acute
tests (crustaceans’ immobilization test, fish survival test, enzymatic test on Daphnia magna) and chronic tests
(growth test on protozoa, reproduction test on crustaceans and juvenile growth test on two species of fish) were
performed. Acute toxicity studies revealed diversified species - sensitivity to the tested compounds. Crustaceans Artemia salina were the most resistant to all three pharmaceuticals. Fish also demonstrated low sensitivity
to ciprofloxacin and 5-fluorouracil (LC(EC)50-96h > 100 mg/l). In the survival tests, the greatest harm in respect
to fish and crustaceans was demonstrated by 17α-ethinylestradiol, and in the enzymatic tests - by ciprofloxacin.
In all chronic tests, the toxic effects of drugs were proven. Tested compounds limited reproduction of crustaceans and growth of protozoa and fry. The risk assessment, conducted on the basis of the PEC/PNEC quotient,
showed a significant risk in relation to aquatic animals caused by the presence of 17α-ethinylestradiol and
5-fluorouracil in concentrations detected in surface waters.