Abstract
Objective
This study aimed to determine the extent and rate of lidocaine released in vivo from two bioequivalent topical delivery systems (TDS) by using complementary assessments: pharmacokinetic analysis in healthy human volunteers, and residual lidocaine in TDS following 12 h of wear. The goal was to explore a potentially more clinically meaningful strength presentation than percent active pharmaceutical ingredient loaded in topical systems.
Methods
A three-arm, open-label, crossover clinical study was conducted in 23 human subjects, with 5% lidocaine topical systems from two manufacturers, and intravenous lidocaine administration. Residual drug and LC–MS/MS analyses were performed on worn TDS and serum samples. The rate and extent of drug released from the TDS during wear were determined through (1) calculations of consumed lidocaine via analysis of residual drug in worn TDS, and (2) a pharmacokinetic approach via derivation of the absolute clearance and serum lidocaine concentration at steady state.
Results
Overall the pharmacokinetic approach underestimated the amount transferred to the subject and exhibited greater variability, which may relate to natural inter-subject variability in pharmacokinetic parameters. Further, lidocaine TDS are intended for localized, not systemic, delivery and this may also explain some of the variability seen in the systemic serum concentrations.
Conclusions
The residual drug and pharmacokinetic approaches align well for transdermal formulations, but the differences in administration route (topical versus transdermal) all but eliminates the potential use of the pharmacokinetic approach unless additional compartmental modeling is explored.
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Abbreviations
- AIC:
-
Akaike information criteria
- API:
-
Active pharmaceutical ingredient
- AUC:
-
Area under the concentration–time curve
- CL:
-
Absolute clearance
- Cmax :
-
Maximum serum concentration
- Css :
-
Concentration at steady state
- Cp:
-
Serum drug concentration
- IV:
-
Intravenous
- Kel :
-
Elimination rate constant
- LC–MS/MS:
-
Liquid chromatography-tandem mass spectrometry
- LLE:
-
Liquid liquid extraction
- NCA:
-
Non-compartmental analysis
- PK:
-
Pharmacokinetic
- RSD:
-
Relative standard deviation
- SBC:
-
Schwarz Bayesian criteria
- SD:
-
Standard deviation
- SE:
-
Standard error
- TDS:
-
Topical delivery system
- T max :
-
Time of maximum serum concentration
- T1/2 :
-
Elimination half-life
- UPLC:
-
Ultra-performance liquid chromatography
- Vss :
-
Volume of distribution
- WSSR:
-
Weighted sum square residuals
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Funding
This project was funded by the following grants: National Institute for Pharmaceutical Technology and Education U01 Critical Patch Manufacturing Sector Research Initiative (5U01FD004275), and NIH/NCATS CTSA U54R001356.
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Qing Cai and Armita Azarpanah are Co-first author.
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Cai, Q., Azarpanah, A., Bhatt, J.A. et al. Examination of the Rate and Extent of Drug Released from Commercial Topical Delivery Systems During Wear: An Example with Lidocaine Topical Systems. Pharm Res 41, 39–50 (2024). https://doi.org/10.1007/s11095-023-03617-7
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DOI: https://doi.org/10.1007/s11095-023-03617-7