Comparability of the Reference Drug Pulmozim and a Similar Drug Tigerase in Terms of their Pharmacodynamic, Toxicological and Pharmacokinetic Properties

This work presents research studies into the comparability of Tigerase® (inhalation solution, manufactured by JSC «GENERIUM», Russia) to the reference drug Pulmozim® (inhalation solution, manufactured by Hoffmann-La Roche Ltd., Switzerland). Both drugs contain human recombinant deoxyribonuclease I – dornase alpha as an active substance and are intended for the treatment of cystic fibrosis with pulmonary manifestations (cystic fibrosis). The specific enzymatic activity of dornase alpha was studied in vitro and ex vivo using samples of patients’ purulent sputum. The pharmacokinetic parameters of the drugs were studied in the blood serum, bronchi and lungs. The main physiological parameters (body weight and temperature, the state of the cardiovascular, respiratory, excretory systems, hematological and biochemical blood parameters, pathomorphological changes in the internal organs, including the state of the cornea of the eyes, mortality rates) were assessed in comparative studies of subchronic toxicity in juvenile and sexually mature rats using 28-day inhalation in doses of 0.2 mg/kg to sexually mature and 0.26 mg/kg to juvenile animals (the dose was 6 times higher than the recommended dose for clinical use). It was concluded that the drugs were comparable in terms of their enzymatic, mucolytic (secretolytic) DNase activity, safety profile, and basic pharmacokinetic parameters.