DEVELOPMENT AND EVALUATION OF LYOPHILIZED POWDER TO PREPARE SOLUTION FOR INJECTIONS BASED ON DOXYCYCLINE

The range of doxycycline drugs on the pharmaceutical market of the Ukraine is very limited and is represented by solid forms (capsules and tablets) while a rapid effect and maximum bioavailability of the drug can be provided by parenteral administration. The object of the study is the drug doxycycline hyclate in the form of lyophilisate to prepare solution for injections. During the development of the drug it was taken into account that aqueous doxycycline solution is pH dependent and tends to shift the solution pH during long-term storage. Therefore, excipients such as stabilizer and antioxidant providing buffering properties and stability of the solution were introduced into the composition. According to the research results an optimal composition of lyophilized powder was selected, the production technology with the stage of solution treatment with activated carbon was developed which allowed to obtain lyophilized powder with a well-formed porous mass without splits, cracks and fissures, resistant to shaking, and the prepared solution for parenteral administration is stable by the «Degree of coloration» quality indicator during accelerated storage regimen. It was found that doxycycline hyclate in the form of a lyophilisate shows a wide range of antibacterial activity. Comparative studies in vitro for two drugs, in the form of lyophilisate with doxycycline hyclate for injections and hard gelatin capsules with 100 mg of doxycycline hyclate, confirm equivalence of their bacteriostatic action against bacteria causing infectious diseases in humans.