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fos·car·net fäs-'kär-nət n a hydrated sodium salt Na3CO5P·6H2O that is an antiviral analog of pyrophosphate and is administered intravenously to individuals infected with HIV to treat retinitis caused by a cytomegalovirus called also foscarnet sodium
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n.
an antiviral drug used in the treatment of infections caused by herpesviruses, including cytomegalovirus, that are resistant to aciclovir, especially in patients with AIDS. It is administered by intravenous injection. Possible side-effects include thirst and increased urine output, nausea and vomiting, fatigue, headache, and kidney damage. Trade name: Foscavir.
Medical dictionary. 2011.