The study to be performed will utilize already FDA-approved marketed products in healthy adults for the purpose to generate data for establishing rate of drug delivery of Transderm Scop® TDDS (transdermal drug delivery system) in healthy adults and to ensure safety of individuals utilizing these types of products.
Transdermal drug delivery systems (TDDS) available in the form of patches are convenient, attractive, and easy to use systems. Scopolamine patches are very popular TDDS available on the United States market today. Accurate determination of the rate and extent of drug release and absorption is crucial to ensure the safety of individuals using these and other types of patches. Delivery rate can be determined early in the development process by using in vitro skin flux permeation studies, and later in humans by accurately quantifying residual drug from patches post-wear and in pharmacokinetic studies. In this proposal, the investigators will employ two types of evaluation to determine the rate and extent of drug release and absorption from RLD (reference listed drug) Transderm Scop® TDDS (transdermal drug delivery system), namely residual drug analysis post-wear and pharmacokinetic analysis in healthy adult volunteers. In addition, the investigators will compare the plasma drug concentrations following patch and intravenous administration of Scopolamine, in order to determine the absolute bioavailability of these patches. The investigators will conduct residual drug analysis of TDDS following in vivo wear using highly sensitive validated quantification methods. Positive outcomes of this project will identify appropriate methods to determine the rate and extent of drug release and absorption from TDDS, and will help regulatory agencies in the development of Guidances for Industry regarding the characterization of drug release and absorption kinetics to ensure the safety of individuals utilizing these types of products
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
26
TDDS dosage is 1.5 mg/72 hrs
0.4 mg via intravenous injection
University of Iowa
Iowa City, Iowa, United States
Measurement of Maximum Serum Concentration of Scopolamine (Cmax)
Time frame: Measured at time points: pre-dose, 1,2,3,4,5,6,8,10,12,24,36,48,60, and 72 hours during Intervention: Transderm Scop® and at time points: pre-dose, 2.5,5,10,20,30,45 minutes, 1.5,2,3,4,5,6,8,10,12 hours during Intervention: scopolamine HBr
Assessment of Scopolamine Clearance (CL)
This will be done only after the IV is administered to estimate the rate of removal of scopolamine from the body. Will not be measured during patch arm.
Time frame: Measured at time points: 2.5,5,10,20,30,45 minutes, 1.5,2,3,4,5,6,8,10,12,24,36,48 hours during Intervention: scopolamine HBr
Measurement of Volume of Scopolamine Distribution (V)
This measure is only analyzed for the IV scopolamine HBr arm of the study.
Time frame: Measured at time points: 2.5,5,10,20,30,45 minutes, 1.5,2,3,4,5,6,8,10,12,24,36,48 hours during Intervention: scopolamine HBr
Measurement of Elimination Rate Constant of Scopolamine (Kel)
Time frame: Measured at time points: 73,74,78,84,96,108,120 hours during Intervention: Transderm Scop® and at time points: pre-dose, 2.5,5,10,20,30,45 minutes, 1.5,2,3,4,5,6,8,10,12 hours during Intervention: scopolamine HBr
Measurement of Time of Maximum Serum Scopolamine Concentration (Tmax)
Time frame: Measured at time points: pre-dose, 1,2,3,4,5,6,8,10,12,24,36,48,60, and 72 hours during Intervention: Transderm Scop® and at time points: pre-dose, 2.5,5,10,20,30,45 minutes, 1.5,2,3,4,5,6,8,10,12 hours during Intervention: scopolamine HBr
Determination of Area Under the Serum Concentration-time Curve (AUC)
Time frame: Measured at time points:1,2,3,4,5,6,8,10,12,24,36,48,60,72,73,74,78,84,96,108,120 hours during Intervention: Transderm Scop® and at time points: 2.5,5,10,20,30,45 minutes, 1.5,2,3,4,5,6,8,10,12,24,36, and 48 hours during Intervention: scopolamine HBr
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Residual Drug Analysis in Worn TDDS
This will be done in the TDDS after its removal to estimate total amount of absorbed scopolamine.
Time frame: 3 - 6 months