The article presents the results of monitoring the safety of prolonged use of the oral bihormonal contraceptive drug SEX BARRIER® for delaying and interrupting estrus in home cats by their owners. The use of the bihormonal contraceptive preparation SEX BARRIER® in the home cats by the owners does not lead to disturbances in the genital area, clinical status, morphological and biochemical parameters of animals blood. All owners have confirmed the 100 % effectiveness of the bi-hormonal preparation SEX BARRIER® for both interruption and delay of estrus.