Active substances exhibit synergy, the drug acts bactericidal against gram-negative (Escherichia coli, Klebsiella spp., Proteus spp., Campylobacter spp., Pseudomonas aeruginosa, Bordetella spp., Pasteurella spp., Haemophilus spp., Actinobacillus spp.) and gram-positive bacteria (Staphylococcus spp., Streptococcus spp., Listeria monocytogenes, Corynebacterium spp.), Eimeria, Chlamydia, Mycoplasmas.
Sulfadimidine, as part of the drug, is an antibacterial agent from sulfonamides group. The mechanism of action is due to competitive antagonism with para-aminobenzoic acid, inhibition of dihydropteroate synthetase, impaired synthesis of tetrahydrofolic acid, which is necessary for the synthesis of purines and pyrimidines.
Diaminopyrimidine derivative, trimethoprim, has a slow bactericidal effect; it reversibly inhibits bacterial dihydrofolate reductase, disrupts the synthesis of tetrahydrofolic acid from dihydrofolic acid, the formation of purine and pyrimidine bases, nucleic acids, thereby inhibiting the growth and reproduction of microorganisms. The combination of trimethoprim with sulfadiazine is characterized by a bactericidal effect and a wide spectrum of activity, including microflora resistant to many antimicrobial drugs.
After oral administration of the drug, sulfadimidine and trimethoprim are absorbed in the gastrointestinal tract and penetrate into all organs and body tissues, reaching maximum concentrations in blood serum after 2-3 hours. Therapeutic concentration is maintained for 24 hours after administration.
The drug is excreted from the body with urine and feces, in lactating animals - partly with milk, in birds - with eggs. In case of impaired liver and kidney function, an increase in the elimination period is possible.