ðɪs fəsfˈɑːnɪk ˈæsɪd dᵻɹˈɪvətˌɪv mˈɑːɹkɪɾᵻd baɪ klˈɪnaɪdʒən æz fˈɑːskɑːɹnɪt sˈoʊdiəm ˌʌndɚ ðə tɹˈeɪd nˈeɪm fˈɑːskɐvˌɪɹ ɪz ɐn ˌæntɪvˈaɪɚɹəl mˌɛdɪkˈeɪʃən jˈuːzd tə tɹˈiːt hˈɜːpiːz vˈaɪɹəsᵻz, ɪŋklˈuːdɪŋ dɹˈʌɡɹᵻsˈɪstənt sˈaɪɾoʊmɡˌæləvˌaɪɹəs sˌiːˌɛmvˈiː ænd hˈɜːpiːz sˈɪmplɛks vˈaɪɹəsᵻz tˈaɪps wˈʌn ænd tˈuː ˌeɪtʃˌɛsvˈiː wˈʌn ænd ˌeɪtʃˌɛsvˈiː tˈuː.
This phosphonic acid derivative (marketed by Clinigen as foscarnet sodium under the trade name Foscavir) is an antiviral medication used to treat herpes viruses, including drug-resistant cytomegalovirus (CMV) and herpes simplex viruses types 1 and 2 (HSV-1 and HSV-2).