|Trade names||Noxafil, Posanol|
|By mouth (oral suspension, delayed-release tablets), IV|
|Protein binding||98 to 99%|
|Elimination half-life||16 to 31 hours|
|Excretion||Fecal (71–77%) and renal (13–14%)|
|Chemical and physical data|
|Molar mass||700.778 g/mol|
|3D model (JSmol)|
|(what is this?)|
Posaconazole is used to treat invasive aspergillosis and candidiasis and fungal infections caused by Scedosporium and Fusarium species, which may occur in immunocompromised patients. It is also used for the treatment of oropharyngeal candidiasis (OPC), including OPC refractory to itraconazole and/or fluconazole therapy.
Mode of action
Posaconazole works by disrupting the close packing of acyl chains of phospholipids, impairing the functions of certain membrane-bound enzyme systems such as ATPase and enzymes of the electron transport system, thus inhibiting growth of the fungi. It does this by blocking the synthesis of ergosterol by inhibiting of the enzyme lanosterol 14α-demethylase and accumulation of methylated sterol precursors. Posaconazole is significantly more potent at inhibiting 14-alpha demethylase than itraconazole.
Posaconazole is absorbed within three to five hours. It is predominately eliminated through the liver, and has a half-life of about 35 hours. Oral administration of posaconazole taken with a high-fat meal exceeds 90% bioavailability and increases the concentration by four times compared to fasting state.
There is also some indication that posaconazole may be the most effective treatment for both chronic and acute Chagas disease, showing much better efficacy than benznidazole. Schering-Plough is currently recruiting participants for a phase II clinical trial in Argentina to test its efficacy against asymptomatic, chronic Chagas.
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