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Vinarov Z, Abrahamsson B, Artursson P, Batchelor H, Berben P, Bernkop-Schnürch A, Butler J, Ceulemans J, Davies N, Dupont D, Flaten GE, Fotaki N, Griffin BT, Jannin V, Keemink J, Kesisoglou F, Koziolek M, Kuentz M, Mackie A, Meléndez-Martínez AJ, McAllister M, Müllertz A, O'Driscoll CM, Parrott N, Paszkowska J, Pavek P, Porter CJH, Reppas C, Stillhart C, Sugano K, Toader E, Valentová K, Vertzoni M, De Wildt SN, Wilson CG, Augustijns P. Current challenges and future perspectives in oral absorption research: An opinion of the UNGAP network. Adv Drug Deliv Rev 2021; 171:289-331. [PMID: 33610694 DOI: 10.1016/j.addr.2021.02.001] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 01/12/2021] [Accepted: 02/01/2021] [Indexed: 02/06/2023]
Abstract
Although oral drug delivery is the preferred administration route and has been used for centuries, modern drug discovery and development pipelines challenge conventional formulation approaches and highlight the insufficient mechanistic understanding of processes critical to oral drug absorption. This review presents the opinion of UNGAP scientists on four key themes across the oral absorption landscape: (1) specific patient populations, (2) regional differences in the gastrointestinal tract, (3) advanced formulations and (4) food-drug interactions. The differences of oral absorption in pediatric and geriatric populations, the specific issues in colonic absorption, the formulation approaches for poorly water-soluble (small molecules) and poorly permeable (peptides, RNA etc.) drugs, as well as the vast realm of food effects, are some of the topics discussed in detail. The identified controversies and gaps in the current understanding of gastrointestinal absorption-related processes are used to create a roadmap for the future of oral drug absorption research.
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Affiliation(s)
- Zahari Vinarov
- Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium; Department of Chemical and Pharmaceutical Engineering, Sofia University, Sofia, Bulgaria
| | - Bertil Abrahamsson
- Oral Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Gothenburg, Sweden
| | - Per Artursson
- Department of Pharmacy, Uppsala University, Uppsala, Sweden
| | - Hannah Batchelor
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Philippe Berben
- Pharmaceutical Development, UCB Pharma SA, Braine- l'Alleud, Belgium
| | - Andreas Bernkop-Schnürch
- Department of Pharmaceutical Technology, Institute of Pharmacy, University of Innsbruck, Innsbruck, Austria
| | - James Butler
- GlaxoSmithKline Research and Development, Ware, United Kingdom
| | | | - Nigel Davies
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | | | - Gøril Eide Flaten
- Department of Pharmacy, UiT The Arctic University of Norway, Tromsø, Norway
| | - Nikoletta Fotaki
- Department of Pharmacy and Pharmacology, University of Bath, Bath, United Kingdom
| | | | | | | | | | | | - Martin Kuentz
- Institute for Pharma Technology, University of Applied Sciences and Arts Northwestern Switzerland, Basel, Switzerland
| | - Alan Mackie
- School of Food Science & Nutrition, University of Leeds, Leeds, United Kingdom
| | | | | | - Anette Müllertz
- Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
| | | | | | | | - Petr Pavek
- Faculty of Pharmacy, Charles University, Hradec Králové, Czech Republic
| | | | - Christos Reppas
- Department of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
| | | | - Kiyohiko Sugano
- College of Pharmaceutical Sciences, Ritsumeikan University, Shiga, Japan
| | - Elena Toader
- Faculty of Medicine, University of Medicine and Pharmacy of Iasi, Romania
| | - Kateřina Valentová
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Maria Vertzoni
- Department of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
| | - Saskia N De Wildt
- Department of Pharmacology and Toxicology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Clive G Wilson
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Patrick Augustijns
- Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium.
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Impact of gastrointestinal tract variability on oral drug absorption and pharmacokinetics: An UNGAP review. Eur J Pharm Sci 2021; 162:105812. [PMID: 33753215 DOI: 10.1016/j.ejps.2021.105812] [Citation(s) in RCA: 140] [Impact Index Per Article: 46.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Revised: 02/19/2021] [Accepted: 03/16/2021] [Indexed: 12/17/2022]
Abstract
The absorption of oral drugs is frequently plagued by significant variability with potentially serious therapeutic consequences. The source of variability can be traced back to interindividual variability in physiology, differences in special populations (age- and disease-dependent), drug and formulation properties, or food-drug interactions. Clinical evidence for the impact of some of these factors on drug pharmacokinetic variability is mounting: e.g. gastric pH and emptying time, small intestinal fluid properties, differences in pediatrics and the elderly, and surgical changes in gastrointestinal anatomy. However, the link of colonic factors variability (transit time, fluid composition, microbiome), sex differences (male vs. female) and gut-related diseases (chronic constipation, anorexia and cachexia) to drug absorption variability has not been firmly established yet. At the same time, a way to decrease oral drug pharmacokinetic variability is provided by the pharmaceutical industry: clinical evidence suggests that formulation approaches employed during drug development can decrease the variability in oral exposure. This review outlines the main drivers of oral drug exposure variability and potential approaches to overcome them, while highlighting existing knowledge gaps and guiding future studies in this area.
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Seoane RG, Garcia-Recio V, Garrosa M, Rojo MÁ, Jiménez P, Girbés T, Cordoba-Diaz M, Cordoba-Diaz D. Human Health Effects of Lactose Consumption as a Food and Drug Ingredient. Curr Pharm Des 2020; 26:1778-1789. [PMID: 32048961 DOI: 10.2174/1381612826666200212114843] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 01/01/2020] [Indexed: 02/07/2023]
Abstract
Lactose is a reducing sugar consisting of galactose and glucose, linked by a β (1→4) glycosidic bond, considered as an antioxidant due to its α-hydroxycarbonyl group. Lactose is widely ingested through the milk and other unfermented dairy products and is considered to be one of the primary foods. On the other hand, lactose is also considered as one of the most widely used excipients for the development of pharmaceutical formulations. In this sense, lactose has been related to numerous drug-excipient or drug-food pharmacokinetic interactions. Intolerance, maldigestion and malabsorption of carbohydrates are common disorders in clinical practice, with lactose-intolerance being the most frequently diagnosed, afflicting 10% of the world's population. Four clinical subtypes of lactose intolerance may be distinguished, namely lactase deficiency in premature infants, congenital lactase deficiency, adult-type hypolactasia and secondary lactase intolerance. An overview of the main uses of lactose in human nutrition and in the pharmaceutical industry and the problems derived from this circumstance are described in this review.
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Affiliation(s)
- Rafael G Seoane
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain
| | - Verónica Garcia-Recio
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain
| | - Manuel Garrosa
- Area of Histology, Faculty of Medicine and INCYL, University of Valladolid, 47005 Valladolid, Spain
| | - María Á Rojo
- Area of Experimental Sciences, Miguel de Cervantes European University, 47012 Valladolid, Spain
| | - Pilar Jiménez
- Area of Nutrition and Food Sciences, Faculty of Medicine, University of Valladolid, 47005 Valladolid, Spain
| | - Tomás Girbés
- Area of Nutrition and Food Sciences, Faculty of Medicine, University of Valladolid, 47005 Valladolid, Spain
| | - Manuel Cordoba-Diaz
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain.,University Institute of Industrial Pharmacy (IUFI), Complutense University of Madrid, 28040 Madrid, Spain
| | - Damián Cordoba-Diaz
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain.,University Institute of Industrial Pharmacy (IUFI), Complutense University of Madrid, 28040 Madrid, Spain
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Matsumura N, Ono A, Akiyama Y, Fujita T, Sugano K. Bottom-Up Physiologically Based Oral Absorption Modeling of Free Weak Base Drugs. Pharmaceutics 2020; 12:E844. [PMID: 32899235 PMCID: PMC7558956 DOI: 10.3390/pharmaceutics12090844] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 08/24/2020] [Accepted: 08/27/2020] [Indexed: 12/20/2022] Open
Abstract
In this study, we systematically evaluated "bottom-up" physiologically based oral absorption modeling, focusing on free weak base drugs. The gastrointestinal unified theoretical framework (the GUT framework) was employed as a simple and transparent model. The oral absorption of poorly soluble free weak base drugs is affected by gastric pH. Alternation of bulk and solid surface pH by dissolving drug substances was considered in the model. Simple physicochemical properties such as pKa, the intrinsic solubility, and the bile micelle partition coefficient were used as input parameters. The fraction of a dose absorbed (Fa) in vivo was obtained by reanalyzing the pharmacokinetic data in the literature (15 drugs, a total of 85 Fa data). The AUC ratio with/without a gastric acid-reducing agent (AUCr) was collected from the literature (22 data). When gastric dissolution was neglected, Fa was underestimated (absolute average fold error (AAFE) = 1.85, average fold error (AFE) = 0.64). By considering gastric dissolution, predictability was improved (AAFE = 1.40, AFE = 1.04). AUCr was also appropriately predicted (AAFE = 1.54, AFE = 1.04). The Fa values of several drugs were slightly overestimated (less than 1.7-fold), probably due to neglecting particle growth in the small intestine. This modeling strategy will be of great importance for drug discovery and development.
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Affiliation(s)
- Naoya Matsumura
- Minase Research Institute, Ono Pharmaceutical Co., Ltd., 3-1-1 Sakurai, Shimamoto-cho, Mishima-gun, Osaka 618-8585, Japan
| | - Asami Ono
- Laboratory for Chemistry, Manufacturing, and Control, Pharmaceuticals Production & Technology Center, Asahi Kasei Pharma Corporation, 632-1 Mifuku, Izunokuni, Shizuoka 410-2321, Japan;
| | - Yoshiyuki Akiyama
- Central Pharmaceutical Research Institute, Japan Tobacco Inc., 1-1 Murasaki-cho, Takatsuki, Osaka 569-1125, Japan;
| | - Takuya Fujita
- Laboratory of Molecular Pharmacokinetics, College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan;
| | - Kiyohiko Sugano
- Molecular Pharmaceutics Lab., College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan;
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Impact of regional differences along the gastrointestinal tract of healthy adults on oral drug absorption: An UNGAP review. Eur J Pharm Sci 2019; 134:153-175. [DOI: 10.1016/j.ejps.2019.04.013] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 04/03/2019] [Accepted: 04/09/2019] [Indexed: 02/06/2023]
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6
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Application of an automated small-scale in vitro transfer model to predict in vivo precipitation inhibition. Int J Pharm 2019; 565:458-471. [DOI: 10.1016/j.ijpharm.2019.05.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 05/06/2019] [Accepted: 05/10/2019] [Indexed: 12/25/2022]
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7
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Zhang H, Li Q, Zhu X, Wu M, Li C, Li X, Liu C, Shen Z, Ding Y, Hua S. Association of Variability and Pharmacogenomics With Bioequivalence of Gefitinib in Healthy Male Subjects. Front Pharmacol 2018; 9:849. [PMID: 30131694 PMCID: PMC6090208 DOI: 10.3389/fphar.2018.00849] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 07/13/2018] [Indexed: 12/24/2022] Open
Abstract
Objective: The aim of the study was to explore the association of pharmacokinetic variability and pharmacogenomics with the bioequivalence of orally administered gefitinib (Iressa®, AstraZeneca) provided by three sponsors in healthy subjects. Methods: The study designs were randomized, open-label, and two-period crossover studies in both fasting and fed healthy subjects. In one fasting study, the sample size was enlarged from 30 to 60 for the failing study. Each study subject received a 250-mg gefitinib tablet with a 21-day washout. The plasma concentrations were measured using LC-MS/MS, and pharmacokinetic parameters were determined by noncompartmental methods. Genetic analyses of CYP3A4, CYP3A5, and CYP2D6 alleles were carried out by the polymerase chain reaction (PCR). Results: Two hundred and sixty healthy male subjects were enrolled. The median maximum plasma concentration (Tmax) was 4-5 h, and the mean elimination half-life (t1/2) was 18-26 h. The maximum plasma concentration (Cmax) and area under the curve (AUC) increased but Tmax and t1/2 were unaffected by the intake of high-fat food. Three fed and two fasting studies achieved a plausible bioequivalence. The intake of high-fat food decreased the intra-subject variability significantly. In addition, CYP2D6 was associated with gefitinib exposure and may contribute to the high inter-subject variability, but it did not influence the bioequivalence result. Conclusions: Gefitinib is well tolerated, and the bioequivalence is easier to achieve under fed conditions compared to fasting conditions. The 90% confidence interval (CI) of geometric mean ratio (GMR) can be narrowed when the sample size is enlarged without changing the formulation-related technology.
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Affiliation(s)
- Hong Zhang
- Phase I Clinical Research Center, The First Hospital of Jilin University, Changchun, China
| | - Qingmei Li
- The First Affiliated Hospital of Jilin University, Changchun, China
| | - Xiaoxue Zhu
- Phase I Clinical Research Center, The First Hospital of Jilin University, Changchun, China
| | - Min Wu
- Phase I Clinical Research Center, The First Hospital of Jilin University, Changchun, China
| | - Cuiyun Li
- Phase I Clinical Research Center, The First Hospital of Jilin University, Changchun, China
| | - Xiaojiao Li
- Phase I Clinical Research Center, The First Hospital of Jilin University, Changchun, China
| | - Chengjiao Liu
- Phase I Clinical Research Center, The First Hospital of Jilin University, Changchun, China
| | - Zhenwei Shen
- The First Affiliated Hospital of Jilin University, Changchun, China
| | - Yanhua Ding
- Phase I Clinical Research Center, The First Hospital of Jilin University, Changchun, China
| | - Shucheng Hua
- The First Affiliated Hospital of Jilin University, Changchun, China
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8
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Vendelbo MH, Gormsen LC, Jessen N. Imaging in Pharmacogenetics. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2018; 83:95-107. [PMID: 29801585 DOI: 10.1016/bs.apha.2018.02.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
An increasing collection of imaging technologies makes it possible to differentiate treatment responders from nonresponders based on genetic variation. This chapter will review some of the imaging technologies currently available in nuclear medicine to visualize drug absorption, distribution, metabolism, and elimination. Some of the commonly used techniques to detect radiation-emitting compounds are the two-dimensional scintigraphy and the three-dimensional single-photon emission computed tomography (SPECT) which both detect photons using a gamma camera, and the three-dimensional positron emission tomography (PET), which detect the decay of positron-emitting radionuclides. Current examples include visualization of functional effects of genetic variants, and these provide proof of concept for imaging in pharmacogenetics as a tool to improve efficacy and safety of drugs.
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Affiliation(s)
- Mikkel H Vendelbo
- Aarhus University Hospital, Aarhus, Denmark; Aarhus University, Aarhus, Denmark
| | | | - Niels Jessen
- Aarhus University Hospital, Aarhus, Denmark; Aarhus University, Aarhus, Denmark.
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Ni XL, Chen LX, Zhang H, Yang B, Xu S, Wu M, Liu J, Yang LL, Chen Y, Fu SZ, Wu JB. In vitro and in vivo antitumor effect of gefitinib nanoparticles on human lung cancer. Drug Deliv 2017; 24:1501-1512. [PMID: 28961023 PMCID: PMC8241075 DOI: 10.1080/10717544.2017.1384862] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Revised: 09/21/2017] [Accepted: 09/22/2017] [Indexed: 01/31/2023] Open
Abstract
Gefitinib (GEF) is the first epidermal growth factor receptor (EGFR)-targeting agent launched as an anticancer drug. It is an accepted opinion that modifying GEF strong hydrophobicity and poor bioavailability would not only enhance its antitumor effects, but also reduce its side effects. In this study, GEF-loadedpoly(ε-caprolactone)-poly(ethyleneglycol)-poly(ε-caprolactone) (PCEC) -bearing nanoparticles (GEF-NPs) were prepared by a solid dispersion method and characterized. The particle sizes increased with the increase in GEF/PCEC mass ratio in feed. GEF-NPs (10%) were mono-dispersed, smaller than 24 nm, zeta potential was approximately -18 mV, percentage encapsulation and loading, were more than 9% and 92%, respectively, and drug was slowly released but without a biphasic pattern. Microscopy studies of the optimized formulation confirmed that the prepared nanoparticles are spherical in nature. Cytotoxicity results indicated that cell growth inhibition induced by free GEF and GEF-NPs were dose and time dependent. Compared with free GEF, GEF-NPs enhanced antitumor effects, reduced side effects and significantly prolonged survival time in vivo. CD31, ki-67 and EGFR expression were significantly lower in the GEF-NPs group compared with other groups (p< .05). These findings demonstrated that GEF-NPs have the potential to attain superior outcomes and to overcome complications such as organs toxicity, therapeutic resistance and disease relapse.
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Affiliation(s)
- Xiao Ling Ni
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Long Xia Chen
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Heng Zhang
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Bo Yang
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Shan Xu
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Min Wu
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Jing Liu
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Ling Lin Yang
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Yue Chen
- Department of Nuclear Medicine, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Shao Zhi Fu
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
| | - Jing Bo Wu
- Department of Oncology, the Affiliated hospital of Southwest Medical University, Luzhou, China
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10
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Individualized dosing of tyrosine kinase inhibitors: are we there yet? Drug Discov Today 2015; 20:18-36. [DOI: 10.1016/j.drudis.2014.09.007] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Revised: 07/25/2014] [Accepted: 09/12/2014] [Indexed: 12/11/2022]
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Hodges LA, Hughes A, Targett D, Durcan MJ. Does a hot drink provide faster absorption of paracetamol than a tablet? A pharmacoscintigraphic study in healthy male volunteers. Pharm Res 2014; 31:2078-85. [PMID: 24558011 PMCID: PMC4153977 DOI: 10.1007/s11095-014-1309-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 01/14/2014] [Indexed: 11/29/2022]
Abstract
PURPOSE To investigate the hypothesis that paracetamol is absorbed faster from a hot drink than from a standard tablet using simultaneous scintigraphic imaging and pharmacokinetic sampling. METHODS Twenty-five healthy male volunteers received both paracetamol formulations in a randomised manner. The formulation administered in the first treatment arm was radiolabelled to allow scintigraphic monitoring. In both treatment arms, blood samples were taken for assessing paracetamol absorption. RESULTS Following the hot drink, paracetamol absorption was both significantly faster and greater over the first 60 min post-dose compared with the tablet, as evidenced by the median time to reach t0.25 μg/mL of 4.6 and 23.1 min, respectively, and AUC0-60 of 4668.00 and 1331.17 h*ng/mL, respectively. In addition, tmax was significantly shorter for the hot drink (median time = 1.50 h) compared with the tablet (1.99 h). However, Cmax was significantly greater following the tablet (9,077 ng/mL) compared with the hot drink (8,062 ng/mL). Onset of gastric emptying after the hot drink was significantly faster than after the standard tablet (7.9 versus 54.2 min), as confirmed scintigraphically. CONCLUSIONS Compared with a standard tablet, a hot drink provides faster absorption of paracetamol potentially due to more rapid gastric emptying.
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Affiliation(s)
- Lee Ann Hodges
- Bio-Images Research Ltd, Within Glasgow Royal Infirmary, 84 Castle Street, Glasgow, G4 0SF, UK,
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12
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Feasibility of capsule endoscopy for direct imaging of drug delivery systems in the fasted upper-gastrointestinal tract. Pharm Res 2014; 31:2044-53. [PMID: 24549826 DOI: 10.1007/s11095-014-1306-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2013] [Accepted: 01/14/2014] [Indexed: 12/22/2022]
Abstract
PURPOSE To develop a minimally-invasive method for direct visualization of drug delivery systems in the human stomach and to compare the obtained results with an established in vitro model. The method should provide the capsule rupture, dispersion characteristics, and knowledge regarding the surrounding physiological environment in the stomach. METHODS A capsule endoscopic method was developed. The disintegration time, dispersion characteristics and the impact of the physiological environment on different lipid based delivery systems in different gelatin capsules in the fasted stomach of nine healthy volunteers were visualized. Biorelevant dissolution studies using a USP II apparatus and a droplet size analysis of the released SNEDDS were performed. RESULTS Visualization of the behavior of both hard and soft gelatin capsules formulations was possible. The disintegration and dispersion of EP oil in a soft capsule and SNEDDS in a hard shell capsule were visualized. The in vitro release rates were different from the in vivo release rates of the soft capsule due to volume, fluid composition and motility differences but not for the hard capsule containing SNEDDS. CONCLUSIONS A minimally-invasive capsule endoscopic method was developed for direct visualizing of drug delivery systems in the human stomach and maybe later, in the duodenum.
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14
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Imaging of Gastrointestinal Absorption and Biodistribution of an Orally Administered Probe Using Positron Emission Tomography in Humans. Clin Pharmacol Ther 2012; 91:653-9. [DOI: 10.1038/clpt.2011.267] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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15
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Weitschies W, Wilson CG. In vivo imaging of drug delivery systems in the gastrointestinal tract. Int J Pharm 2011; 417:216-26. [DOI: 10.1016/j.ijpharm.2011.07.031] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Revised: 07/19/2011] [Accepted: 07/19/2011] [Indexed: 11/17/2022]
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Abstract
For a select number of drugs, proper management of patients includes monitoring serum or plasma concentrations of the drugs and adjusting the doses accordingly - this practice is referred to as therapeutic drug monitoring (TDM). The need for TDM arises when pharmacokinetic variability of drugs is not easily accounted for by common clinical parameters. Many chemotherapeutic drugs have large interindividual variability, yet TDM is not commonplace in chemotherapy management. This review will discuss pharmacokinetics in the context of chemotherapeutic drugs, examine the few instances where TDM is currently used in the field of oncology and propose other drugs where TDM might be useful for dose adjustments in the management of chemotherapy.
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Wilson C, Clarke CP, Starkey YYL, Clarke GD. Comparison of a novel fast-dissolving acetaminophen tablet formulation (FD-APAP) and standard acetaminophen tablets using gamma scintigraphy and pharmacokinetic studies. Drug Dev Ind Pharm 2011; 37:747-53. [DOI: 10.3109/03639045.2010.538058] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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18
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Sugano K. Computational oral absorption simulation of free base drugs. Int J Pharm 2010; 398:73-82. [DOI: 10.1016/j.ijpharm.2010.07.027] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 07/15/2010] [Accepted: 07/17/2010] [Indexed: 11/25/2022]
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19
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Wilson CG. The transit of dosage forms through the colon. Int J Pharm 2010; 395:17-25. [PMID: 20576492 DOI: 10.1016/j.ijpharm.2010.04.044] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Accepted: 04/30/2010] [Indexed: 10/19/2022]
Abstract
Colonic transit is a subject of great relevance when considering in vivo/in vitro relationships for oral controlled release dosage forms. Our knowledge of colonic motility has first come from the clinic, where measurement of the whole gut transit of different excreted markers was used as a method of discriminating pathologies. X-ray contrast, although widely available, was used sparing due to the accumulating dosimetry associated with each exposure. Although such methods were used for swallowing studies, gamma scintigraphy allowed physicians to measure colon function with a more moderate radiation burden. The ability to label meal and dosage form separately and to measure dispersion with more certainty, prompted the use in pharmaceutical sciences; finally, the relationship between blood concentrations and transit of different sized dosage began to be understood. This mini-review considers the development of colon transit measurements and how different designs of clinical assessment assist in elucidating size and shape influence on colon transit in man.
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Affiliation(s)
- Clive G Wilson
- Strathclyde Institute of Pharmacy & Biomedical Sciences, Glasgow G4 0NR, Scotland, UK.
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Melichar B, Dvořák J, Kalábová H, Hyšpler R, Krčmová L, Kašparová M, Urbánek L, Solichová D. Intestinal permeability, vitamin A absorption and serum alpha-tocopherol during therapy with gefitinib. Scandinavian Journal of Clinical and Laboratory Investigation 2010; 70:180-7. [DOI: 10.3109/00365511003653581] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Bohuslav Melichar
- Departments of Oncology & Radiotherapy
- Department of Oncology, Palacký University Medical School & Teaching Hospital, Olomouc, Czech Republic
| | | | | | - Radomír Hyšpler
- Departments of Gerontology & Metabolic Care, Charles University Medical School & Teaching Hospital, Hradec Králové, Czech Republic
| | - Lenka Krčmová
- Departments of Gerontology & Metabolic Care, Charles University Medical School & Teaching Hospital, Hradec Králové, Czech Republic
- Department of Analytical Chemistry, Charles University School of Pharmacy, Hradec Králové
| | - Markéta Kašparová
- Departments of Gerontology & Metabolic Care, Charles University Medical School & Teaching Hospital, Hradec Králové, Czech Republic
- Department of Analytical Chemistry, Charles University School of Pharmacy, Hradec Králové
| | - Lubor Urbánek
- Departments of Gerontology & Metabolic Care, Charles University Medical School & Teaching Hospital, Hradec Králové, Czech Republic
- Department of Analytical Chemistry, Charles University School of Pharmacy, Hradec Králové
| | - Dagmar Solichová
- Departments of Gerontology & Metabolic Care, Charles University Medical School & Teaching Hospital, Hradec Králové, Czech Republic
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