fˈɑːskɑːɹnɪt fˌɑːsfənˌoʊmθɐnˈoʊɪk ˈæsɪd, nˈoʊn baɪ ɪts bɹˈænd nˈeɪm fˈɑːskɐvˌɪɹ, ɪz ɐn ˌæntɪvˈaɪɚɹəl mˌɛdɪkˈeɪʃən wˌɪtʃ ɪz pɹaɪmˈɛɹᵻli jˈuːzd tə tɹˈiːt vˈaɪɚɹəl ɪnfˈɛkʃənz ɪnvˈɑːlvɪŋ ðə hˈɜːpɪsvˌɪɹɪdˌiː fˈæmɪli.
Foscarnet (phosphonomethanoic acid), known by its brand name Foscavir, is an antiviral medication which is primarily used to treat viral infections involving the Herpesviridae family.