ESTIMATION OF CLINICAL AND PHARMACOKINETIC EQUIVALENCE OF ORIGINAL AND GENERIC CARVEDILOLS IN PATIENTS WITH HYPERTENSION OF 1-2 GRADES

Aim. To study clinical equivalence of original (DilatrendR, ≪Hoffmann-La Roche≫, Switzerland) and of generic (VedicardolR, ≪Synthesis≫, Russia) carvedilols with estimation of their serum level. And to study pharmacoeconomic advantages of their usage in patients with arterial hypertension (HT) of 1-2 stages.Material and methods. Study was double blind, randomized, crossed. 30 patients (8 men and 22 women, 57 y.o. average) with HT of 1 stage (3,3 %) and 2 stage (96,7 %) were included in the study. Original or generic carvedilols (12,5 mg twice a day) were prescribed to the patients. Hydrochlorothiazide was added followed carvedilol dose enlargement if initial antihypertensive effect had been insufficient. The second similar course of therapy with other carvedilol took place in 2 weeks after cancellation of the first carvedilol. Carvedilol serum level, blood pressure (BP), heart rate (HR) and side effects were registered on each visit.Results. 75 % of Vedikardol-group patients and 75 % of Dilatrend-group patients had reached target BP level (<140/90 mm Hg). Monotherapy was effective more than in a half of patients in both groups. Dilatrend had more expressed influence on HR in comparison with Vedikardol. Both drugs did not differ significantly in frequency and intensity of side effects.Conclusion. Generic carvedilol (VedicardolR) has clinical efficiency and pharmacokinetics similar to these of original carvedilol (DilatrendR). Generic carvedilol has lower cost of treatment than this in original carvedilol

COMPARATIVE PHARMACOKINETICS AND EFFECT ON THE HEMODYNAMICS OF ORIGINAL AND GENERIC NEBIVOLOL IN HEALTHY VOLUNTEERS

Beta-blockers are an important part of modern pharmacotherapy in cardiology. The introduction of generics into clinical practice requires clear evidence of bioequivalence to the original drug.Aim. To study the pharmacokinetics and effect on hemodynamic parameters of the original and a generic nebivolol in healthy volunteers in the fasting state. Material and methods. 18 healthy volunteers were included into the randomized open study on cross-balanced design. They received single dose (5 mg) of two compared preparations of nebivolol under fasting condition. The concentration of unchanged nebivolol in blood plasma was determined by gas chromatography-tandem mass spectrometry. Calculation of pharmacokinetic parameters and assessment of the hemodynamic were performed.Results. The concentrations of nebivolol after the original and generic drugs intake did not differ significantly in any time point (AUC0-∞ 41.09±46.82 vs 47.16±66.58 ng•hr/mL and T1/2 30.84±10.78 vs 29.59±12.08 hours, respectively). Blood pressure reduction was slightly more pronounced when taking generic nebivolol, while the reduction in heart rate at 2 and 4 hours – after original nebivolol intake.Conclusion. A comparative pharmacokinetic study of the genetic nebivolol showed its bioequivalence to the original drug. The effect on hemodynamic parameters with single dose (5 mg) of generic and original nebivolol in healthy volunteers was comparable