The aim of the study was the evaluation of the preventive and therapeutic efficacy of Finadyne in the event of MMA risk in sows. The experiment was conducted in two farms of similar environmental conditions. The study included 42 sows aged 1-3 years and 469 piglets born to these females. The animals, randomly chosen in each farm, were divided into 2 groups, i.e. experimental and control ones. In farm A 9 sows, while in farm B 12 females were included per group. Each sow of the experimental group was injected intramuscularly with Finadyne at a dose of 2 ml/50 kg b.w. (2 mg of flunixin/kg b.w.), and, if necessary, the injection of the product was repeated after 24 hours. The females of the control group were not treated with medicines at all. In total, the MMA syndrome occurred in 5 sows (23.80%) in the experimental groups in both farms, while 7 sows in the control groups (33.33%) were affected. Number and body weight of piglets at birth date were very similar in the tested groups. However, subsequently during the newborn piglets. lives the yield expressed by daily gains were statistically significant (p ≤ 0.05) to the advantage of litters of the experimental sows. This is a measurable indicator of Finadyne action. In the group of the sows treated with Finadyne, the diarrhoea signs were found in 5 litters (23.80%), while in the control groups in 7 litters (33.33%). In the experimental groups, 11 piglets died up to 21 day of life, i.e. 4.70%, while in the control groups . 16 newborns (6.86%), i.e. 2.16% piglets more. It was also discovered that administration of the product to sows after farrowing had a positive influence on fertility, as well as an impact on mating efficacy and rejection rate. All in all, 95.20% of sows of the experimental groups were effectively inseminated, while 90.40% in controls.