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oseltamivir dose

Donald F Smee, Dale L Barnard, Steven M Jones
JNJ63623872 (formerly known as VX-787) is an inhibitor of influenza A virus polymerases through interaction with the viral PB2 subunit. This interaction blocks the cap-snatching activity of the virus that is essential for virus replication. Previously published work has documented antiviral activity of JNJ63623872 in cell culture and mouse infection studies. In this report, we extend the in vivo observations by comparing the efficacies of JNJ63623872 and oseltamivir in mice infected with influenza A/California/04/2009 (H1N1pdm) and A/Victoria/3/75 (H3N2) viruses...
October 19, 2016: Antiviral Research
Surendra Kumar
BACKROUND: The outbreak of H1N1 virus had previously reported in India during 2009 flu pandemic. In 2015, the outbreak became widespread throughout India. The states of Gujarat and Rajasthan are severely elected. We studied an outbreak of H1N1 Virus in north-west zone of Rajasthan 2015. OBJECTIVE: To demonstrate the current epidemiological scenario of swine flu (H1N1) in north-west zone of Rajasthan with different demographic factors. METHODS: We screened total 6390 patients...
July 2016: Journal of the Association of Physicians of India
Xian-Ying Yang, Ai-Lin Liu, Shu-Jing Liu, Xiao-Wei Xu, Lin-Fang Huang
To screen for influenza virus neuraminidase inhibition and to provide a reference for the clinical treatment of influenza using traditional Chinese medicines (TCM). In this study, 421 crude extracts (solubilized with petroleum ether, ethanol, ethyl acetate, and aqueous solvents) were obtained from 113 TCM. The medicine extracts were then reacted with oseltamivir, using 2'-(4-methylumbelliferyl)-α-D-N-acetylneuraminic acid (MUNANA) as the substrate, to determine influenza virus neuraminidase activity using a standard fluorimetric assay...
2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Roman Akasov, Sabah Haq, Fiona Haxho, Vanessa Samuel, Sergey V Burov, Elena Markvicheva, Ronald J Neufeld, Myron R Szewczuk
Multicellular tumor spheroids (MTS) have been at the forefront of cancer research, designed to mimic tumor-like developmental patterns in vitro. Tumor growth in vivo is highly influenced by aberrant cell surface-specific sialoglycan structures on glycoproteins. Aberrant sialoglycan patterns that facilitate MTS formation are not well defined. Matrix-free spheroids from breast MCF-7 and pancreatic PANC1 cancer cell lines and their respective tamoxifen (TMX) and gemcitabine (Gem) resistant variants were generated using the RGD platform of cyclic Arg-Gly-Asp-D-Phe-Lys peptide modified with 4-carboxybutyl-triphenylphosphonium bromide (cyclo-RGDfK (TPP))...
September 6, 2016: Oncotarget
Rashmi Dixit, Slade Matthews, Gulam Khandaker, Karen Walker, Marino Festa, Robert Booy
BACKGROUND: Oseltamivir is the only antiviral treatment recommended for influenza in young children over the age of 1 year. There is scant data on oseltamivir pharmacokinetics (PK) in infants <1 year. We set out to perform PK measurements in infants who received oseltamivir. METHODS: This study was a prospective, uncontrolled, open label evaluation of the pharmacokinetics of oseltamivir metabolism, safety of oseltamivir, viral clearance in infants <12 months diagnosed with influenza by nasopharyngeal influenza nucleic acid antigen test (NAAT)...
December 2016: Clinical and Translational Medicine
Ashley Wester, Avinash K Shetty
Influenza virus infection is a major cause of morbidity and mortality in children and adults globally. Seasonal epidemics are common due to the rapid virus evolution, whereas the frequent emergence of antigenic variants can result in pandemics and sporadic/endemic avian influenza virus infections. Although annual vaccination is the mainstay for influenza prevention and control, the use of antiviral agents must be considered for treatment and prophylaxis against influenza. Currently available antiviral drugs include neuraminidase inhibitors (NAIs), adamantanes, and a novel polymerase inhibitor (favipiravir)...
2016: Infection and Drug Resistance
Charlene Ranadheera, Mable W Hagan, Anders Leung, Brad Collignon, Todd Cutts, Steven Theriault, Carissa Embury-Hyatt, Darwyn Kobasa
: During the first wave of the 2009 pandemic, caused by a H1N1 influenza virus (pH1N1) of swine origin, antivirals were the only form of therapeutic available to control the proliferation of disease until the conventional strain-matched vaccine was produced. Oseltamivir is an antiviral that inhibits the sialidase activity of the viral neuraminidase (NA) protein and was shown to be effective against pH1N1 viruses in ferrets. Furthermore, it was used in humans to treat infections during the pandemic and is still used for current infections without reported complication or exacerbation of illness...
November 1, 2016: Journal of Virology
Elitsa L Pavlova, Nikolay N Zografov, Lora S Simeonova
This study compares the antioxidant capacities in vitro of several synthetic and natural compounds applied and researched for influenza treatment - oseltamivir, isoprinosine, ellagic acid, vitamin E and vitamin C. Three chemical systems are utilized for the generation of reactive oxygen species (ROS) at pH 7.4 and pH 8.5: (1) Fenton's (Fe(2+)+H2O2) for OH and -OH species (2) H2O2 (3) NADH-phenazinemethosulfat, for superoxide radicals (O2(-)). The kinetics was evaluated by lucigenin-enhanced chemiluminescence...
July 29, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Rebecca Frise, Konrad Bradley, Neeltje van Doremalen, Monica Galiano, Ruth A Elderfield, Peter Stilwell, Jonathan W Ashcroft, Mirian Fernandez-Alonso, Shahjahan Miah, Angie Lackenby, Kim L Roberts, Christl A Donnelly, Wendy S Barclay
Influenza viruses cause annual seasonal epidemics and occasional pandemics. It is important to elucidate the stringency of bottlenecks during transmission to shed light on mechanisms that underlie the evolution and propagation of antigenic drift, host range switching or drug resistance. The virus spreads between people by different routes, including through the air in droplets and aerosols, and by direct contact. By housing ferrets under different conditions, it is possible to mimic various routes of transmission...
2016: Scientific Reports
Hua Huang, Jingjing Wang, Qian Li, Jiang Duan, Qin Yao, Qiaoling Zheng, Jing Wang, Di Wu, Qiong Zhou, Yuqin Tian, Jun Zhang
OBJECTIVE: The objective of the study was to determinetransplacental of oseltamivir phosphate and its active metabolite oseltamivir carboxylate using the ex vivo human placental perfusion model in Chinese Hans population. STUDY DESIGN: Perfusion studies were performed on twenty placentas from healthy term pregnancies. Concentrations typical for an 75mg, twice-daily oral dose were tested(oseltamivir phosphate 65.2 ng/ml and oseltamivir carboxylate 348 ng/ml), along with the positive control antipyrine 0...
July 18, 2016: Journal of Maternal-fetal & Neonatal Medicine
Alessandro Boianelli, Niharika Sharma-Chawla, Dunja Bruder, Esteban A Hernandez-Vargas
Influenza pandemics and seasonal outbreaks have shown the potential of Influenza A virus (IAV) to enhance susceptibility to a secondary infection with the bacterial pathogen Streptococcus pneumoniae (Sp). The high morbidity and mortality rate revealed the poor efficacy of antiviral drugs and vaccines to fight IAV infections. Currently, the most effective treatment for IAV is by antiviral neuraminidase inhibitors. Among them, the most frequently stockpiled is Oseltamivir which reduces viral release and transmission...
2016: Frontiers in Cellular and Infection Microbiology
R Hama, C L Bennett
Oseltamivir is contraindicated for people aged 10-19 in principle in Japan, due to concern about abnormal behaviours. Sudden death is another concern. This review examines growing evidence of their association and discusses underlying mechanisms of these sudden-onset type reactions to oseltamivir. First, the importance of animal models and the concept of human equivalent dose (HED) is summarized. Second, the specific condition for oseltamivir use, influenza infection, is reviewed. Third, findings from toxicity studies conducted prior to and after the marketing of oseltamivir are reported on to provide context on the observation of a possible causal association...
June 30, 2016: Acta Neurologica Scandinavica
Fan-Gui Min, Yu Zhang, Xiang-Mei Liu, Guo-Liang Zhang, Qiao Lin, Guang Nie
OBJECTIVE: To investigate whether Chinese medicine (CM) recipes could ameliorate H5N1 influenza virus infection in BALB/c mice model. METHODS: BALB/c mice were orally administrated with 5 CM recipes (removing toxin, tonifying qi, cooling blood, laxation, and compound recipes), oseltamivir, or saline solution respectively for 5 consecutive days after the infection of H5N1 influenza virus. Series of indices were employed to evaluate the amelioration of the 5 CM recipes on infection, including clinical assessment, gross observation, histopathologic findings, cytokine levels and viral burden in the lungs...
June 29, 2016: Chinese Journal of Integrative Medicine
Angel S Galabov, Milka Mileva, Lora Simeonova, Galina Gegova
BACKGROUND: Influenza is a highly contagious viral infection of the respiratory system. To attack two processes involved in flu pathogenesis-viral replication in the infected body and oxidative damages, we studied the combination effect of neuraminidase inhibitor oseltamivir and antioxidant α-tocopherol in experimental model of influenza. METHODS: After inoculation of albino mice with 10 MLD50 (50% mouse lethal dose) of influenza virus A/Aichi/2/68 (H3N2), oseltamivir was applied orally at three doses, 2...
August 2015: Antiviral Chemistry & Chemotherapy
D B C Wu, N Chaiyakunapruk, C Pratoomsoot, K K C Lee, H Y Chong, R E Nelson, P F Smith, C Kirkpatrick, M A Kamal, K Nieforth, G Dall, S Toovey, D C Kong, A Kamauu, C Rayner
No abstract text is available yet for this article.
November 2014: Value in Health: the Journal of the International Society for Pharmacoeconomics and Outcomes Research
Yuji Nakamura, Rieko Sasaki, Xin Cao, Takeshi Wada, Shogo Hamaguchi, Hiroko Izumi-Nakaseko, Kentaro Ando, Hikaru Tanaka, Akira Takahara, Atsushi Sugiyama
We evaluated proarrhythmic risk of intravenous oseltamivir with chronic atrioventricular block canine model (n = 4) and action-potential assay on guinea-pig right ventricle (n = 5). Oseltamivir in doses of 3-30 mg/kg, i.v. did not induce torsade de pointes in the canine model, whereas that in concentrations of 30-300 μM decreased maximum rate of phase 0 depolarization, shortened action potential duration at 30%, 60% and 90% repolarization levels, but prolonged difference in action-potential duration between 30% and 90% repolarization levels in a concentration-related manner...
May 2016: Journal of Pharmacological Sciences
Huanhuan Ren, Guiqin Wang, Shuangshuang Wang, Honglin Chen, Zhiwei Chen, Hongxing Hu, Genhong Cheng, Paul Zhou
Newly emerging highly pathogenic avian influenza (HPAI) H5N2, H5N3, H5N5, H5N6, H5N8 and H5N9 viruses have been spreading in poultry and wild birds. The H5N6 viruses have also caused 10 human infections with 4 fatal cases in China. Here, we assessed the cross-neutralization and cross-protection of human and mouse monoclonal antibodies against 2 viruses: a HPAI H5N8 virus, A/chicken/Netherlands/14015526/2014 (NE14) and a HPAI H5N6 virus, A/Sichuan/26221/2014 (SC14). The former was isolated from an infected chicken in Netherlands in 2014 and the latter was isolated from an infected human patient in Sichuan, China...
August 2016: MAbs
Mohamed A Kamal, Barbara J Brennan, Vishak Subramoney, Yi Ting Kayla Lien, Peter N Morcos, Nicolas Frey, Craig R Rayner
Availability of lower-dose oseltamivir capsules, an increased pharmacokinetic database, and a desire to align drug exposure across the spectrum of renal function prompted reassessment of oral dosing in patients with renal impairment. The data set comprised 128 subjects (71 with varying degrees of renal impairment) from 8 studies, which included single and multiple doses of 20-1000 mg. Pharmacokinetic profiles of oseltamivir phosphate (OP) and oseltamivir carboxylate (OC) were modeled simultaneously in NONMEM...
September 2015: Clinical Pharmacology in Drug Development
Yi-Hsiang Chen, Gi-Kung Chang, Shu-Ming Kuo, Sheng-Yu Huang, I-Chen Hu, Yu-Lun Lo, Shin-Ru Shih
Influenza is one of the most common human respiratory diseases, and represents a serious public health concern. However, the high mutability of influenza viruses has hampered vaccine development, and resistant strains to existing anti-viral drugs have also emerged. Novel anti-influenza therapies are urgently needed, and in this study, we describe the anti-viral properties of a Spirulina (Arthrospira platensis) cold water extract. Anti-viral effects have previously been reported for extracts and specific substances derived from Spirulina, and here we show that this Spirulina cold water extract has low cellular toxicity, and is well-tolerated in animal models at one dose as high as 5,000 mg/kg, or 3,000 mg/kg/day for 14 successive days...
2016: Scientific Reports
Haruka Hishiki, Naruhiko Ishiwada, Sachiko Naito, Koo Nagasawa, Tomohiro Someya, Nobue Inoue, Mana Haraki, Tomomichi Kurosaki, Yousuke Kameoka, Kazuo Suzuki
We investigated the clinical symptoms of 206 pediatric patients with influenza virus infection and compared them among oseltamivir-treated, zanamivir-treated, and laninamivir-treated groups in 2013/2014 influenza season. The drug compliance of each neuraminidase inhibitor was good in all three groups. Although the duration of fever after administration of the first dose of each neuraminidase inhibitor were significantly prolonged in the patient with influenza B infection than in the patient with influenza A infection, no statistically significant difference in the clinical efficacy and the side effect among three groups were found...
December 2015: Japanese Journal of Antibiotics
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