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  • 1
    Electronic Resource
    Electronic Resource
    Pharmacokinetic/Pharmacodynamic Modeling in Drug Development (2000)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Pharmacology 40 (2000), S. 67-95 
    Details
    ISSN: 0362-1642
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Chemistry and Pharmacology
    Notes: Abstract We propose a framework for considering the role of pharmacokinetic/ pharmacodynamic modeling in drug development and an appraisal of its current and potential impact on that activity. After some introduction, definitions, and background information on drug development, we discuss subject-matter models that underlie pharmacokinetic/pharmacodynamic modeling and show how they determine appropriate statistical models. We discuss the broad role modeling can play in drug development, enhancing primarily the "learning" steps, i.e. acquiring the information needed for the label and for planning efficient confirmatory clinical trials. Examples of past applications of modeling to drug development are presented in tabular form, followed by a discussion of some practical issues in application. Modeling will not reach its potential utility until it is manifest as a visible and separate work unit within a drug development program. We suggest that that work unit is the "in numero" study: a protocol-driven exercise designed to extract additional information, and/or answer a specific drug-development question, through an integrated model-based (meta-) analysis of existent raw data, often pooled across separate (clinical) studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pharmtox.40.1.67
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  • 2
    Electronic Resource
    Electronic Resource
    Population approaches in drug development (1994)
    Springer
    European journal of clinical pharmacology 46 (1994), S. 389-391 
    Details
    ISSN: 1432-1041
    Keywords: Population approach ; Drug development ; software ; pharmacokinetics ; pharmacodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract An expert meeting to discuss population pharmacokinetic/pharmacodynamic software was held in Brussels in November 1993 under the auspices of the European Co-operation in Science and Technology (COST), Medicine (B1) programme. Recently developed statistical methods offer the possibility of gaining integrated information on pharmacokinetics and response from relatively sparse observational data obtained directly in patients who are being treated with the drug under development. These methods can minimize the need to exclude patient groups and also allow analysis of a variety of unbalanced designs that frequently arise in the evaluation of the relationships between dose or concentration on the one hand and efficacy or safety on the other relationships that do not readily lend themselves to other forms of statistical analysis. The purpose of the Brussels meeting was to evaluate the state of both existing software and software under development, and to specify the needs and wishes of potential users of such software. It was apparent from the meeting that software development for population data analysis is currently a very active area of investigation and that several very good packages are already available, with more in development. The general consensus of the meeting was that well validated, easy to use software was essential to the implementation of the population approach to drug development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191898
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Practical experience and issues in designing and performing population pharmacokinetic/pharmacodynamic studies (1996)
    Springer
    European journal of clinical pharmacology 49 (1996), S. 251-254 
    Details
    ISSN: 1432-1041
    Keywords: Population pharmacokinetics ; Pharmacodynamics ; experimental design ; drug development ; clinical trials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract An expert meeting to discuss issues relating to the design of population pharmacokinetic/pharmacodynamic (PK/PD) studies was held in Brussels in March 1995, under the auspices of the European Co-operation in Science and Technology (COST), Medicine (B1) programme. The purpose of the meeting was to discuss the experts' experience in designing and performing population PK/PD studies. The topics discussed were current practice, logistical issues, ensuring the accuracy of data, covariate assessment, communication, and protocol design. The main conclusions from the meeting were: 1) a population PK/PD analysis should be one of the objectives of a clinical trial and should not compromise the other objectives; 2) it is particularly important to communicate the purpose of the population PK/PD analysis to the investigators and to convince them of the importance of accurately recording dosing and sampling times; 3) some prior knowledge of the PK and PD models and covariate relationships is necessary for the analysis of sparse phase III data; 4) computer simulation and optimal design measures may be useful in defining sampling times; 5) population methods and objectives must be specified as completely as possible in the protocol. Participants: L. Aarons (UK), L. Balant (Switzerland), P. Bechtel (France), R. Bruno (France), P. Burtin (Switzerland), C. Dubruc (France), E. Fuseau (UK), J. Gabrielsson (Sweden), U. Gundert-Remy (Germany), R. Jochemsen (France), M. Karlsson (Sweden), C. Laveille (France), I. Meineke (Germany), F. Mentré (France), P. Morselli (France), G. Paintaud (France), A. Racine-Poon (Switzerland), J. Rodriguez (Spain), F. Rombout (The Netherlands), M. Rowland (UK), J.-L. Steimer (Switzerland), A. Van Peer (Belgium), S. Vozeh (Switzerland), W. Weber (Germany), B. Wittke (Switzerland) The views expressed by the participants do not necessarily reflect those of the organizations they represent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226323
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    New strategies in drug development and clinical evaluation: the population approach (1993)
    Springer
    European journal of clinical pharmacology 45 (1993), S. 93-94 
    Details
    ISSN: 1432-1041
    Keywords: Drug development ; Clinical evaluation ; new strategies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315486
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Practical experience and issues in designing and performing population pharmacokinetic/pharmacodynamic studies (1996)
    Springer
    European journal of clinical pharmacology 49 (1996), S. 251-254 
    Details
    ISSN: 1432-1041
    Keywords: Key words Population pharmacokinetics ; Pharmacodynamics; experimental design ; drug development ; clinical trials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract An expert meeting to discuss issues relating to the design of population pharmacokinetic/pharmacodynamic (PK/PD) studies was held in Brussels in March 1995, under the auspices of the European Co-operation in Science and Technology (COST), Medicine (B1) programme. The purpose of the meeting was to discuss the experts’ experience in designing and performing population PK/PD studies. The topics discussed were current practice, logistical issues, ensuring the accuracy of data, covariate assessment, communication, and protocol design. The main conclusions from the meeting were: 1) a population PK/PD analysis should be one of the objectives of a clinical trial and should not compromise the other objectives; 2) it is particularly important to communicate the purpose of the population PK/PD analysis to the investigators and to convince them of the importance of accurately recording dosing and sampling times; 3) some prior knowledge of the PK and PD models and covariate relationships is necessary for the analysis of sparse phase III data; 4) computer simulation and optimal design measures may be useful in defining sampling times; 5) population methods and objectives must be specified as completely as possible in the protocol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226323
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Zero-order absorption and linear disposition of oral colchicine in healthy volunteers (1989)
    Springer
    European journal of clinical pharmacology 37 (1989), S. 79-84 
    Details
    ISSN: 1432-1041
    Keywords: colchicine ; pharmacokinetics ; oral administration ; zero-order absorption ; systemic availability ; dose dependency ; healthy volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of colchicine has been studied in nine healthy male volunteers after oral doses of 0.5, 1, and 1.5 mg as tablets. Plasma and urine samples were collected over 48 h and analysed for colchicine by radioimmunoassay. Individual colchicine concentration profiles in plasma and urine were well described by a two-compartment open model with zero-order input. Considering the absorption variables as specific to each experiment, the lag time (0–0.35 h) and duration (0.39–2.38 h) of absorption were found to be independent of dose, while the zero-order rate constant of absorption (k0) increased linearly with dose. Disposition variables were taken as common to the three experiments, except in six subjects in whom renal excretion varied significantly across experiments in a dose-independent manner. For seven subjects the terminal half-life was 19.4 h, the oral apparent volume of distribution at steady-state (Vss/f) was 691 l, and the oral systemic clearance (CL/f) was 33.1 l·h−1. In the two other subjects, the values were unreliable, but the estimated terminal half-life was greater than 48 h, Vss/f ranged from 1690 to 3480 l, and CL/f was in the range of the other subjects in 1 subject, and it was about 15l·h−1 in the other. In the latter subject, these estimates, together with the observation that plasma concentration reached a plateau at 2 to 5 h after ingestion, suggest enterohepatic cycling of colchicine. Overall, the disposition of colchicine was linear in the dose range 0.5–1.5 mg, with a long terminal half-life, and absorption obeyed zero-order kinetics, with k0 proportional to dose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00609430
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    Paper (German National Licenses)
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