1
|
Ali HSM, Ahmed SA, Alqurshi AA, Alalawi AM, Shehata AM, Alahmadi YM. Tadalafil-Loaded Self-Nanoemulsifying Chewable Tablets for Improved Bioavailability: Design, In Vitro, and In Vivo Testing. Pharmaceutics 2022; 14:1927. [PMID: 36145675 PMCID: PMC9504296 DOI: 10.3390/pharmaceutics14091927] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/08/2022] [Accepted: 09/08/2022] [Indexed: 11/17/2022] Open
Abstract
This research aimed to develop innovative self-nanoemulsifying chewable tablets (SNECT) to increase oral bioavailability of tadalafil (TDL), a nearly insoluble phosphodiesterase-5 inhibitor. Cinnamon essential oil, PEG 40 hydrogenated castor oil (Cremophor® RH 40), and polyethylene glycol 400 served as the oil, surfactant, and cosurfactant in the nanoemulsifying system, respectively. Primary liquid self-nanoemulsifying delivery systems (L-SNEDDS) were designed using phase diagrams and tested for dispersibility, droplet size, self-emulsifying capability, and thermodynamic stability. Adsorption on a carrier mix of silicon dioxide and microcrystalline cellulose was exploited to solidify the optimum L-SNEDDS formulation as self-nanoemulsifying granules (SNEG). Lack of crystalline TDL within the granules was verified by DSC and XRPD. SNEG were able to create a nanoemulsion instantaneously (165 nm), a little larger than the original nanoemulsion (159 nm). SNECT were fabricated by compressing SNEG with appropriate excipients. The obtained SNECT retained their quick dispersibility dissolving 84% of TDL within 30 min compared to only 18% dissolution from tablets of unprocessed TDL. A pharmacokinetic study in Sprague−Dawley rats showed a significant increase in Cmax (2.3-fold) and AUC0−24 h (5.33-fold) of SNECT relative to the unprocessed TDL-tablet (p < 0.05). The stability of TDL-SNECT was checked against dilutions with simulated GI fluids. In addition, accelerated stability tests were performed for three months at 40 ± 2 °C and 75% relative humidity. Results revealed the absence of obvious changes in size, PDI, or other tablet parameters before and after testing. In conclusion, current findings illustrated effectiveness of SNECT to enhance TDL dissolution and bioavailability in addition to facilitating dose administration.
Collapse
Affiliation(s)
- Hany S. M. Ali
- Department of Pharmaceutics and Pharmaceutical Technology, College of Pharmacy, Taibah University, Al-Madinah Al-Munawarah P.O. Box 344, Saudi Arabia
- Department of Pharmaceutics, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
| | - Sameh A. Ahmed
- Department of Pharmacognosy and Pharmaceutical Chemistry, College of Pharmacy, Taibah University, Al-Madinah Al-Munawarah P.O. Box 344, Saudi Arabia
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
| | - Abdulmalik A. Alqurshi
- Department of Pharmaceutics and Pharmaceutical Technology, College of Pharmacy, Taibah University, Al-Madinah Al-Munawarah P.O. Box 344, Saudi Arabia
| | - Ali M. Alalawi
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Al-Madinah Al-Munawarah P.O. Box 344, Saudi Arabia
| | - Ahmed M. Shehata
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Al-Madinah Al-Munawarah P.O. Box 344, Saudi Arabia
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62521, Egypt
| | - Yaser M. Alahmadi
- Department of Clinical and Hospital Pharmacy, College of Pharmacy, Taibah University, Al-Madinah Al-Munawarah P.O. Box 344, Saudi Arabia
| |
Collapse
|
2
|
Ahmed SA, Alalawi AM, Shehata AM, Alqurshi AA, Alahmadi YM, S. M. Ali H. Fabric phase sorptive extraction coupled with UPLC-ESI-MS/MS method for fast and sensitive quantitation of tadalafil in a bioequivalence study. Saudi Pharm J 2022; 30:1143-1152. [PMID: 36164574 PMCID: PMC9508631 DOI: 10.1016/j.jsps.2022.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 06/10/2022] [Indexed: 01/01/2023] Open
Abstract
The current study coupled fabric phase sorptive extraction (FPSE) with ultraperformance liquid chromatography method with electrospray ionization and tandem mass detection (UPLC-ESI-MS/MS) for fast and sensitive determination of tadalafil (TAD) in a bioequivalence study. Fabric phase sorptive extraction allowed direct extraction of TAD from the sample matrix with improved selectivity, repeatability, and recoveries. A sol–gel Carbowax 20 M (CX-20 M) coated FPSE membrane revealed the best extraction efficiency for TAD because of its strong affinity for analytes via intermolecular interactions, high mass transfer rate to FPSE membrane, and high permeability. An automated multiple reaction monitoring (MRM) optimizer was employed for the best selection of the precursor and product ions, ion breakdown profile, the fine adjustment of the fragmentor voltages for each precursor ions, and the collision energies for the product ions. The chromatographic separation was conducted using a mobile phase A: 5.0 mM ammonium acetate with 0.1 % formic acid in water and mobile phase B: formic acid (0.1%) in acetonitrile in ratio (55:45, v/v) through isocratic elution mode on an Agilent EclipsePlus C18 (50 × 2.1 mm, 1.8 μm) column and the flow rate was adjusted at 0.4 mL min−1. The total run time per sample was 1.0 min. The method was validated by FDA standards for bioanalytical method validation over a concentration range of 0.1–100 ng mL−1 with a correlation coefficient of 0.9993 and the lower limit of quantitation (LLOQ) was 0.1 ng mL−1 in rat plasma. Intra- and inter-assay precision (%RSD) were lower than 4.1% and accuracy (%RE) was within 2.4%. The developed FPSE-UPLC-ESI-MS/MS method was effectively used in a randomized, two-way, single-dose, crossover study to compare the bioequivalence of two TAD formulations from different companies in male rats and verified to be bioequivalent.
Collapse
Affiliation(s)
- Sameh A. Ahmed
- Pharmacognosy and Pharmaceutical Chemistry Department, College of Pharmacy Taibah University, AlMadinah AlMunawarah 30001, Saudi Arabia
- Corresponding author.
| | - Ali M. Alalawi
- Pharmacology and Toxicology Department, College of Pharmacy, Taibah University, AlMadinah AlMunawarah 30001, Saudi Arabia
| | - Ahmed M. Shehata
- Pharmacology and Toxicology Department, College of Pharmacy, Taibah University, AlMadinah AlMunawarah 30001, Saudi Arabia
- Pharmacology and Toxicology Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Abdulmalik A. Alqurshi
- Pharmaceutics and Pharmaceutical Technology Department, College of Pharmacy, Taibah University, AlMadinah AlMunawarah 30001, Saudi Arabia
| | - Yaser M. Alahmadi
- Clinical and Hospital Pharmacy Department, College of Pharmacy, Taibah University, AlMadinah AlMunawarah 30001, Saudi Arabia
| | - Hany S. M. Ali
- Pharmaceutics and Pharmaceutical Technology Department, College of Pharmacy, Taibah University, AlMadinah AlMunawarah 30001, Saudi Arabia
- Pharmaceutics Department, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
| |
Collapse
|
3
|
Shao R, Yang DD, Ruan ZR, Chen JL, Hu Y, Jiang B, Lou HG. Pharmacokinetic and Bioequivalence Evaluation of 2 Tadalafil Tablets in Healthy Male Chinese Subjects Under Fasting and Fed Conditions. Clin Pharmacol Drug Dev 2021; 11:165-172. [PMID: 34453416 DOI: 10.1002/cpdd.1007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 07/22/2021] [Indexed: 11/11/2022]
Abstract
Tadalafil is an effective, reversible, and competitive phosphodiesterase 5 inhibitor mainly used to treat erectile dysfunction. This study investigated the bioequivalence of generic and marketed formulations of 10-mg tadalafil tablets under fasted and fed conditions. This open-label, randomized, single-dose, 2-period crossover study included 53 healthy Chinese men (aged 20-43 years). Plasma samples were collected from 0.5 hours before treatment to 72 hours after each dose and analyzed using ultra-high-performance liquid chromatography coupled with tandem mass spectrometry. Pharmacokinetic parameters were calculated using noncompartmental analysis. Safety assessments were performed throughout the study. For the fasted state, the 90% confidence intervals of the geometric mean ratios between the generic and marketed formulations were 86.1% to 99.1% for the maximum plasma concentration and 88.4% to 100.3% for the area under the plasma concentration-time curve from time 0 to infinity, and the corresponding values under the fed state were and 99.9% to 108.4% and 95.7% to 104.3%, respectively. All data were within the accepted bioequivalence range of 80% to 125%. After consuming high-fat, high-calorie meals in the fed condition, the time to the maximum plasma concentration was similar between the formulations, and area under the plasma concentration-time curve from time 0 to infinity and maximum plasma concentration were 10.2% and 6.55% higher, respectively, for the marketed formulation. Thus, food had no clinically relevant effect on tadalafil exposure following a single oral dose in healthy Chinese men. No serious adverse reactions were reported. These results indicated that the analyzed generic and marketed tadalafil tablets were bioequivalent with similar safety profiles.
Collapse
Affiliation(s)
- Rong Shao
- Center of Clinical Pharmacology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, PR China
| | - Dan-Dan Yang
- Center of Clinical Pharmacology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, PR China
| | - Zou-Rong Ruan
- Center of Clinical Pharmacology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, PR China
| | - Jin-Liang Chen
- Center of Clinical Pharmacology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, PR China
| | - Yin Hu
- Center of Clinical Pharmacology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, PR China
| | - Bo Jiang
- Center of Clinical Pharmacology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, PR China
| | - Hong-Gang Lou
- Center of Clinical Pharmacology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, PR China
| |
Collapse
|
4
|
Kamiya Y, Otsuka S, Miura T, Yoshizawa M, Nakano A, Iwasaki M, Kobayashi Y, Shimizu M, Kitajima M, Shono F, Funatsu K, Yamazaki H. Physiologically Based Pharmacokinetic Models Predicting Renal and Hepatic Concentrations of Industrial Chemicals after Virtual Oral Doses in Rats. Chem Res Toxicol 2020; 33:1736-1751. [PMID: 32500706 DOI: 10.1021/acs.chemrestox.0c00009] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Recently developed high-throughput in vitro assays in combination with computational models could provide alternatives to animal testing. The purpose of the present study was to model the plasma, hepatic, and renal pharmacokinetics of approximately 150 structurally varied types of drugs, food components, and industrial chemicals after virtual external oral dosing in rats and to determine the relationship between the simulated internal concentrations in tissue/plasma and their lowest-observed-effect levels. The model parameters were based on rat plasma data from the literature and empirically determined pharmacokinetics measured after oral administrations to rats carried out to evaluate hepatotoxic or nephrotic potentials. To ensure that the analyzed substances exhibited a broad diversity of chemical structures, their structure-based location in the chemical space underwent projection onto a two-dimensional plane, as reported previously, using generative topographic mapping. A high-throughput in silico one-compartment model and a physiologically based pharmacokinetic (PBPK) model consisting of chemical receptor (gut), metabolizing (liver), central (main), and excreting (kidney) compartments were developed in parallel. For 159 disparate chemicals, the maximum plasma concentrations and the areas under the concentration-time curves obtained by one-compartment models and modified simple PBPK models were closely correlated. However, there were differences between the PBPK modeled and empirically obtained hepatic/renal concentrations and plasma maximal concentrations/areas under the concentration-time curves of the 159 chemicals. For a few compounds, the lowest-observed-effect levels were available for hepatotoxicity and nephrotoxicity in the Hazard Evaluation Support System Integrated Platform in Japan. The areas under the renal or hepatic concentration-time curves estimated using PBPK modeling were inversely associated with these lowest-observed-effect levels. Using PBPK forward dosimetry could provide the plasma/tissue concentrations of drugs and chemicals after oral dosing, thereby facilitating estimates of nephrotoxic or hepatotoxic potential as a part of the risk assessment.
Collapse
Affiliation(s)
- Yusuke Kamiya
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| | - Shohei Otsuka
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| | - Tomonori Miura
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| | - Manae Yoshizawa
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| | - Ayane Nakano
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| | - Miyu Iwasaki
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| | - Yui Kobayashi
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| | - Makiko Shimizu
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| | - Masato Kitajima
- Fujitsu Kyusyu Systems, Higashi-hie, Hakata-ku, Fukuoka 812-0007, Japan
| | - Fumiaki Shono
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kimito Funatsu
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hiroshi Yamazaki
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, 3-3165 Higashi-tamagawa Gakuen, Machida, Tokyo 194-8543, Japan
| |
Collapse
|
5
|
Tantawy MA, Weshahy SA, Wadie M, Rezk MR. Novel HPTLC densitometric methods for determination of tamsulosin HCl and tadalafil in their newly formulated dosage form: Comparative study and green profile assessment. Biomed Chromatogr 2020; 34:e4850. [DOI: 10.1002/bmc.4850] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 04/05/2020] [Accepted: 04/14/2020] [Indexed: 12/21/2022]
Affiliation(s)
- Mahmoud A. Tantawy
- Analytical Chemistry Department, Faculty of PharmacyCairo University Cairo Egypt
| | - Soheir A. Weshahy
- Analytical Chemistry Department, Faculty of PharmacyCairo University Cairo Egypt
| | - Mina Wadie
- Analytical Chemistry Department, Faculty of PharmacyCairo University Cairo Egypt
| | - Mamdouh R. Rezk
- Analytical Chemistry Department, Faculty of PharmacyCairo University Cairo Egypt
| |
Collapse
|
6
|
Bhadoriya A, Dasandi B, Parmar D, Shah PA, Shrivastav PS. Quantitation of tadalafil in human plasma using a sensitive and rapid LC-MS/MS method for a bioequivalence study. J Pharm Anal 2018; 8:271-276. [PMID: 30140492 PMCID: PMC6104147 DOI: 10.1016/j.jpha.2018.01.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 12/30/2017] [Accepted: 01/13/2018] [Indexed: 10/26/2022] Open
Abstract
A highly sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the determination of tadalafil (TAD) in human plasma. TAD and its deuterated internal standard (IS), tadalafil-d3, were extracted from 200 µL plasma using Phenomenex Strata-X-C 33 µ extraction cartridges. Chromatographic analysis was carried out on Synergi™ Hydro-RP C18 (100 mm × 4.6 mm, 4 µm) column with a mobile phase consisting of methanol and 10 mM ammonium formate, pH 4.0 (90:10, v/v), delivered at a flow rate of 0.9 mL/min. Quantitation of the protonated analyte was done on a triple quadrupole mass spectrometer using multiple reaction monitoring via electrospray ionization. The precursor to product ions transitions monitored for TAD and TAD-d3 were m/z 390.3 → 268.2 and m/z 393.1 → 271.2, respectively. The calibration curve was linear over the concentration range of 0.50-500 ng/mL with correlation coefficient, r2 ≥ 0.9994. Acceptable intra-batch and inter-batch precision (≤ 3.7%) and accuracy (97.8% to 104.1%) were obtained at five concentration levels. The recovery of TAD from spiked plasma was highly precise and quantitative (98.95% to 100.61%). Further, the effect of endogenous matrix components was minimal. TAD was found to be stable under different storage conditions in human plasma and also in whole blood samples. The validated method was successfully used to determine TAD plasma concentration in a bioequivalence study with 20 mg TAD tablets in 24 healthy volunteers. Method performance was evaluated by reanalyzing 115 study samples.
Collapse
Affiliation(s)
- Abhaysingh Bhadoriya
- Bioanalytical Department, Synchron Research Services Pvt. Ltd., 5th Floor, the Chambers, Sarkhej-Gandhinagar Highway, Bodakdev, Ahmedabad 380054, India
| | - Bhavesh Dasandi
- Bioanalytical Department, Synchron Research Services Pvt. Ltd., 5th Floor, the Chambers, Sarkhej-Gandhinagar Highway, Bodakdev, Ahmedabad 380054, India
| | - Dharmesh Parmar
- Bioanalytical Department, Synchron Research Services Pvt. Ltd., 5th Floor, the Chambers, Sarkhej-Gandhinagar Highway, Bodakdev, Ahmedabad 380054, India
| | - Priyanka A. Shah
- Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad 380009, India
| | - Pranav S. Shrivastav
- Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad 380009, India
| |
Collapse
|
7
|
Pappula N, Kodali B, Datla PV. Selective and rapid determination of tadalafil and finasteride using solid phase extraction by high performance liquid chromatography and tandem mass spectrometry. J Pharm Biomed Anal 2018; 152:215-223. [PMID: 29427880 DOI: 10.1016/j.jpba.2018.01.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 01/04/2018] [Accepted: 01/11/2018] [Indexed: 01/09/2023]
Abstract
Highly selective and fast liquid chromatography-tandem mass spectrometric (LC-MS/MS) method was developed and validated for simultaneous determination of tadalafil (TDL) and finasteride (FNS) in human plasma. The method was successfully applied for analysis of TDL and FNS samples in clinical study. The method was validated as per USFDA (United States Food and Drug Administration), EMA (European Medicines Agency), and ANVISA (Agência Nacional de Vigilância Sanitária-Brazil) bio analytical method validation guidelines. Glyburide (GLB) was used as common internal standard (ISTD) for both analytes. The selected multiple reaction monitoring (MRM) transitions for mass spectrometric analysis were m/z 390.2/268.2, m/z 373.3/305.4 and m/z 494.2/369.1 for TDL, FNS and ISTD respectively. The extraction of analytes and ISTD was accomplished by a simple solid phase extraction (SPE) procedure. Rapid analysis time was achieved on Zorbax Eclipse C18 column (50 × 4.6 mm, 5 μm). The calibration ranges for TDL and FNS were 5-800 ng/ml and 0.2-30 ng/ml respectively. The results of precision and accuracy, linearity, recovery and matrix effect of the method are acceptable. The accuracy was in the range of 92.9%-106.4% and method precision was also good; %CV was less than 8.1%.
Collapse
Affiliation(s)
- Nagaraju Pappula
- Department of Pharmaceutical Analysis, Hindu College of Pharmacy, Guntur, 522002, Andhra Pradesh, India.
| | - Balaji Kodali
- College of Pharmaceutical Sciences, Acharya Nagarjuna University, Nagarjuna Nagar, 522510, Guntur (Dist), Andhra Pradesh, India
| | | |
Collapse
|
8
|
Kim KY, Nam M, Kwon HJ, Kim KH, Kang SH, Kim SI, Kim CW, Cho SH. Validated UPLC-MS/MS method for the determination of tadalafil in human plasma and its application to a pharmacokinetic study. Transl Clin Pharmacol 2017; 25:21-27. [PMID: 32095455 PMCID: PMC7033536 DOI: 10.12793/tcp.2017.25.1.21] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 02/23/2017] [Accepted: 02/24/2017] [Indexed: 11/19/2022] Open
Abstract
A simple, rapid, and reliable UPLC-MS/MS method was developed and validated for the determination of tadalafil in human plasma. The plasma samples were deproteinized with acetonitrile. Chromatographic separation was performed on a Shiseido C18 (100 × 2.1 mm, 2.7 µm) column with isocratic elution using 2.0 mM ammonium acetate and acetonitrile (55:45, v/v) with 0.1% formic acid at a flow rate of 0.7 mL/min. The total run time was 1 min per sample. The quantitative analysis was performed using multiple reaction monitoring at transition of m/z 390.4 → 268.3 for tadalafil and m/z 475.3 → 283.3 for sildenafil as an internal standard. The method was fully validated over a concentration range of 5–1,000 ng/mL with a lower quantification limit of 5 ng/mL. Intra- and inter-day precision (relative standard deviation, %RSD) were within 8.4% and accuracy (relative error, %RE) was lower than -3.2%. The developed and validated method was successfully applied to a pharmacokinetic study of tadalafil (20 mg) in Korean healthy male subjects (n = 12).
Collapse
Affiliation(s)
- Kwang-Youl Kim
- Department of Clinical Pharmacology, Inha University Hospital, Inha University School of Medicine, Incheon 22332, South Korea
| | - Moonsuk Nam
- Department of Clinical Pharmacology, Inha University Hospital, Inha University School of Medicine, Incheon 22332, South Korea.,Department of Internal Medicine, Inha University Hospital, Inha University School of Medicine, Incheon 22332, South Korea
| | - Hyun-Jung Kwon
- Department of Clinical Pharmacology, Inha University Hospital, Inha University School of Medicine, Incheon 22332, South Korea
| | - Kwang-Hyeon Kim
- Clinical Research Center of H PLUS Yangji Hospital, Sillim-dong, Gwanak-gu, Seoul 08779, South Korea
| | - Seung-Hyun Kang
- Clinical Research Center of H PLUS Yangji Hospital, Sillim-dong, Gwanak-gu, Seoul 08779, South Korea
| | - Sang-Il Kim
- Clinical Research Center of H PLUS Yangji Hospital, Sillim-dong, Gwanak-gu, Seoul 08779, South Korea
| | - Cheol-Woo Kim
- Department of Clinical Pharmacology, Inha University Hospital, Inha University School of Medicine, Incheon 22332, South Korea.,Department of Internal Medicine, Inha University Hospital, Inha University School of Medicine, Incheon 22332, South Korea
| | - Sang-Heon Cho
- Department of Clinical Pharmacology, Inha University Hospital, Inha University School of Medicine, Incheon 22332, South Korea
| |
Collapse
|
9
|
Im SH, Park MJ, Seo H, Choi SH, Kim SK, Ahn SH. Determination of mesoridazine by liquid chromatography-tandem mass spectrometry and its application to pharmacokinetic study in rats. J Chromatogr B Analyt Technol Biomed Life Sci 2014; 958:117-23. [PMID: 24732149 DOI: 10.1016/j.jchromb.2014.03.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 03/07/2014] [Accepted: 03/16/2014] [Indexed: 11/18/2022]
Abstract
The object of the present study was to develop and validate an assay method of mesoridazine in rat plasma using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Plasma samples from rats were prepared by simple protein precipitation and injected onto the LC-MS/MS system for quantification. Mesoridazine and chlorpromazine as an internal standard (IS) were separated by a reversed phase C18 column. A mobile phase was composed of 10mM ammonium formate in water and acetonitrile (ACN) (v/v) by a linear gradient system, increasing the percentage of ACN from 2% at 0.4min to 98% at 2.5min with 4min total run time. The ion transitions monitored in positive-ion mode [M+H](+) of multiple-reaction monitoring (MRM) were m/z 387>126 for mesoridazine and m/z 319>86 for IS. The detector response was specific and linear for mesoridazine at concentrations within the range 0.001-4μg/ml and the correlation coefficient (R(2)) was greater than 0.999 and the signal-to-noise ratios for the samples were ≥10. The intra- and inter-day precision and accuracy of the method were determined to be within the acceptance criteria for assay validation guidelines. The matrix effects were approximately 101 and 99.5% from rat plasma for mesoridazine and chlorpromazine, respectively. Mesoridazine was stable under various processing and/or handling conditions. Mesoridazine concentrations were readily measured in rat plasma samples after intravenous and oral administration. This assay method can be practically useful to the pharmacokinetic and/or toxicokinetic studies of mesoridazine.
Collapse
Affiliation(s)
- So Hee Im
- Department of Drug Discovery Platform Technology, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea; College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Myoung Joo Park
- Department of Drug Discovery Platform Technology, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea
| | - Hyewon Seo
- Department of Drug Discovery Platform Technology, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea
| | - Sung Heum Choi
- Department of Drug Discovery Platform Technology, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea
| | - Sang Kyum Kim
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Sung-Hoon Ahn
- Department of Drug Discovery Platform Technology, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea.
| |
Collapse
|
10
|
Tar MT, Martinez LR, Nosanchuk JD, Davies KP. The effect of methamphetamine on an animal model of erectile function. Andrology 2014; 2:531-6. [PMID: 24706617 DOI: 10.1111/j.2047-2927.2014.00212.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 01/27/2014] [Accepted: 02/26/2014] [Indexed: 12/01/2022]
Abstract
In the US methamphetamine is considered a first-line treatment for attention-deficit hyperactivity disorder. It is also a common drug of abuse. Reports in patients and abusers suggest its use results in impotence. The efficacy of phosphodiesterase-5 inhibitors (PDE5i) to restore erectile function in these patient groups also has not been determined. In these studies, we determined if the rat is a suitable animal model for the physiological effects of methamphetamine on erectile function, and if a PDE5i (tadalafil) has an effect on erectile function following methamphetamine treatment. In acute phase studies, erectile function was measured in male Sprague-Dawley rats, before and after administration of 10 mg/kg methamphetamine i.p. Chronically treated animals received escalating doses of methamphetamine [2.5 mg/kg (1st week), 5 mg/kg (2nd week), and 10 mg/kg (3rd week)] i.p. daily for 3 weeks and erectile function compared with untreated controls. The effect of co-administration of tadalafil was also investigated in rats acutely and chronically treated with methamphetamine. Erectile function was determined by measuring the intracorporal pressure/blood pressure ratio (ICP/BP) following cavernous nerve stimulation. In both acute and chronic phase studies, we observed a significant increase in the rates of spontaneous erections after methamphetamine administration. In addition, following stimulation of the cavernous nerve at 4 and 6 mA, there was a significant decrease in the ICP/BP ratio (approximately 50%), indicative of impaired erectile function. Tadalafil treatment reversed this effect. In chronically treated animals, the ICP/BP ratio following 4 and 6 mA stimulation decreased by approximately 50% compared with untreated animals and erectile dysfunction (ED) was also reversed by tadalafil. Overall, our data suggest that the rat is a suitable animal model to study the physiological effect of methamphetamine on erectile function. Our work also provides a rationale for treating patients that report ED associated with therapeutics-containing methamphetamine or amphetamine with PDE5i.
Collapse
Affiliation(s)
- M T Tar
- Department of Urology, Albert Einstein College of Medicine, Bronx, NY, USA
| | | | | | | |
Collapse
|