[Pharmaceutical studies of intramammary formulations prepared with Pharmachem rifampicin].

Investigations were carried out on the medicines mastiriphin--intramammary syringes, (Mf) in two variants "A" and "B", meant for the treatment of acute mastitis with cows and also mastiriphin depot--intramammary syringes (Mf-depot), as well as two variants with indications for subclinical mastitis cows, containing both medicines in 10 g with 80,000 VI rifampicin, SEC "Pharmachem". Experiments were carried out for determining the stability of the medicines at different pH. The investigations were carried out with 23 lactating and 22 non-lactating cows. Both the degree of retention and the velocity of elimination of rifampicin from the milk and the lactic secretion. It was proved in vitro that rifampicin is stable in a neutral milk milieu (pH 7) in the course of 24 hours, and while in acid or alkaline milieu it was quickly eliminated Mf "A" in the case of intramammary introduction created high bacteriostatic (therapeutic) concentrations in the milk of the lactating animals till the sixth (eighth hour, whereas Mf "B" and the imported analogue rifamasten, provided twice as high levels of antibiotic. Mf-depot "B" introduced in a intramammary way with non-lactating cows was retained in the lactic secretion between 15 and 20 days. The quarantine time limits for using the milk taken from cows, treated in an intramammary way, proved to be 72 hours.