Bioequivalence of Recombinant Human Teriparatide Injection in Healthy Adult Female Subjects in the Fasting State

Abstract A single‐center, randomized, open, 2‐period, self‐crossover, single‐dose trial was conducted to evaluate the bioequivalence of the test (T) and reference (R) preparations in healthy adult female subjects under fasting conditions. Seventy‐six subjects were enrolled in the study, and subjects were randomly divided into 2 groups at a 1:1 ratio and were administered once per period, with a 4‐day washout period. In each period, plasma drug concentrations, blood calcium changes, and antibodies were determined for pharmacokinetics, pharmacodynamics, and immunogenicity analysis, respectively, and adverse events were recorded for safety analysis. The 90% confidence intervals for the geometric mean ratios (T:R) of maximum plasma concentration, area under the plasma concentration‐time curve from time 0 to the last measurable concentration, and area under the plasma concentration‐time curve from time 0 to infinity were within the predefined bioequivalence criterion of 80%‐125%, indicating bioequivalence between the T and R preparations under fasting conditions. Comparable serum calcium levels demonstrated pharmacodynamics similarity, and no differences were found in immunogenicity profiles. Additionally, the incidence of adverse reactions to the T preparation was 18.4% lower than that of the R preparation (31.6%). This study confirmed the bioequivalence of the T and R preparations under fasting conditions, along with comparable immunogenicity profiles and good safety.