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| __NOTOC__
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| {{Artemether lumefantrine}}
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| {{CMG}}; {{AE}} {{chetan}}
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| ==Overview==
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| ===Artemether===
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| '''Artemether''' ([[International Nonproprietary Name|INN]]) is an antimalarial for the treatment of multi-drug resistant strains of ''[[Plasmodium falciparum|falciparum]]'' [[malaria]]. Its combination (co-formulation) with [[Lumefantrine]] has first been marketed by [[Novartis]] under the brand names Riamet and Coartem. Today, this combination therapy is available as generic from several manufacturers.
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| ===Lumefantrine===
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| Used primarily as an antimalarial agent. Lumefantrine is used in combination with artemether for uncomplicated malaria. The main action is against the erythrocytic stage of Plasmodium species and hence used to treat P.falciparum species in chloroquine-resistant areas.
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| ==Category==
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| Antimalarial
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| ==US Brand Names==
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| COARTEM<sup>®</sup>
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| ==FDA Package Insert==
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| '''[[Artemether lumefantrine description|Description]]'''
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| '''| [[Artemether lumefantrine clinical pharmacology|Clinical Pharmacology]]'''
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| '''| [[Artemether lumefantrine microbiology|Microbiology]]'''
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| '''| [[Artemether lumefantrine indications and usage|Indications and Usage]]'''
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| '''| [[Artemether lumefantrine contraindications|Contraindications]]'''
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| '''| [[Artemether lumefantrine warnings and precautions|Warnings and Precautions]]'''
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| '''| [[Artemether lumefantrine adverse reactions|Adverse Reactions]]'''
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| '''| [[Artemether lumefantrine overdosage|Overdosage]]'''
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| '''| [[Artemether lumefantrine dosage and administration|Dosage and Administration]]'''
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| '''| [[Artemether lumefantrine how supplied|How Supplied]]'''
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| '''| [[Artemether lumefantrine labels and packages|Labels and Packages]]'''
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| ==Mechanisms of Action==
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| ===Artemether===
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| The specific [[mechanism of action]] of artemisinin is not well understood, and there is ongoing research directed at elucidating it. When the parasite that causes malaria infects a red blood cell, it consumes hemoglobin and liberates free [[heme]], an iron-porphyrin complex. The iron reduces the peroxide bond in artemisinin generating high-valent iron-oxo species, resulting in a cascade of reactions that produce reactive oxygen [[radical (chemistry)|radicals]] which damage the parasite leading to its death.<ref>Cumming, Jared N.; Ploypradith, Poonsakdi; Posner, Gary H.. Antimalarial activity of artemisinin (qinghaosu) and related trioxanes: mechanism(s) of action. Advances in Pharmacology (San Diego) (1997), 37 253-297.</ref>
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| Numerous studies have investigated the type of damage that these oxygen radicals may induce. For example, Pandey ''et al.'' have observed inhibition of digestive vacuole cysteine protease activity of malarial parasite by artemisinin.<ref>[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=10383451&query_hl=1&itool=pubmed_docsum Pandey et al]</ref> These observations were further confirmed by ex vivo experiments showing accumulation of hemoglobin in the parasites treated with artemisinin, suggesting inhibition of hemoglobin degradation. They found artemisinin to be a potent inhibitor of hemeozoin formation activity of malaria parasite.
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| A 2005 study investigating the mode of action of artemisinin using a yeast model demonstrated that the drug acts on the electron transport chain, generates local reactive oxygen species, and causes the depolarization of the mitochondrial membrane.<ref>Li ''et al.'', PLOS Genetics, September 2005, Volume 1, Issue 3</ref>
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| Artemisinins have also been shown to [[Enzyme inhibitor|inhibit]] PfATP6, a [[SERCA]]-type [[enzyme]] (calcium transporter) and artemisinin has been shown to compete with [[thapsigargin]] for SERCA binding, though artemesinin is much less toxic to mammalian cells. Resistance to artemisinin is conferred by a single mutation in the calcium transporter (PfATP6). This mutation has been studied in the laboratory but recently a study from French Guiana in field isolates of malaria parasites has identified a different mutation in the calcium transporter (PfATP6) that is associated with resistance to artemether, lending support to the idea that PfATP6 is the target for artemisinins.<ref>A.-C. Uhlemann ''et al. Nature Struct. Mol. Biol.'' '''12,''' 628-629;2005</ref>
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| ===Lumefantrine===
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| Exact mechanism is still unknown . A few data show that lumefantrine acts by formation of β-hematin . It inhibits nucleic acid and protein synthesis by forming a complex with hemin.
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| ==References==
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| {{Reflist|2}}
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| [[Category:Antibiotics]]
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| [[Category:Wikinfect]]
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