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To evaluate the pharmacokinetic (PK) and tolerability profiles of a new tablet formulation of tacrolimus and its interindividual variability (IIV) in the systemic exposure, and to compare them with those of the conventional capsule formulation, a randomized, open-label, two-treatment, two-period, two-sequence, crossover study was performed in 47 healthy males. The capsule or tablet formulation of tacrolimus was orally administered, and serial blood samples were collected up to 96 hours after dosing. Whole-blood tacrolimus concentration was determined using liquid chromatography-tandem mass spectrometry. The maximum whole-blood tacrolimus concentration (C max ) and the area under the whole-blood tacrolimus concentration-time curve from 0 hour to the last quantifiable concentration (AUC last ) were compared between the two formulations. The similarity factor (f 2 ) of the in vitro dissolution profiles was calculated. The geometric mean ratio (90% confidence interval) of tablet to capsule was 0.9680 (0.8873-1.0560) and 1.0322 (0.9359-1.1385) for C max and AUC last , respectively. The IIV of C max and AUC last of the tablet was smaller than the capsule. The f 2 values were &gt;50 in all media. Both formulations were well tolerated. Thus, the tablet formulation of tacrolimus has smaller IIV in the systemic exposure than capsule, while having comparable PK and tolerability profiles, which may render it as a better treatment option for organ transplant patients.

drug design, development and therapy

New tablet formulation of tacrolimus with smaller interindividual variability may become a better treatment option than the conventional capsule formulation in organ transplant patients