Chemical Component Summary

Identifiersphosphonomethanoic acid
FormulaC H3 O5 P
Molecular Weight126.00
Isomeric SMILESOC(=O)P(O)(O)=O

Chemical Details

Formal Charge0
Atom Count10
Chiral Atom Count0
Chiral Atomsn/a
Bond Count9
Aromatic Bond Count0
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB00529 Different stereochemistry
DescriptionAn antiviral agent used in the treatment of cytomegalovirus retinitis. Foscarnet also shows activity against human herpesviruses and HIV. [PubChem]
  • Carboxyphosphonic acid
  • Foscarmet
  • Phosphonoformate
  • Phosphonoformic acid
  • Phosphonomethanoic acid
SaltsFoscarnet sodium
Brand Names
  • Foscarnet Sodium
  • Foscavir
  • Triapten
Affected OrganismHuman Herpes Virus
IndicationFor the treatment of CMV retinitis in patients with acquired immunodeficiency syndrome (AIDS) and for treatment of acyclovir-resistant mucocutaneous HSV infections in immunocompromised patients.
PharmacologyFoscarnet is an organic analogue of inorganic pyrophosphate that inhibits replication of herpes viruses <i>in vitro</i> including cytomegalovirus (CMV) and herpes simplex virus types 1 and 2 (HSV-1 and HSV-2). Foscarnet does not require activation (phosphorylation) by thymidine kinase or other kinases and therefore is active in vitro against HSV TK deficient mutants and CMV UL97 mutants. Thus, HSV strains resistant to acyclovir or CMV strains resistant to ganciclovir may be sensitive to foscarnet. However, acyclovir or ganciclovir resistant mutants with alterations in the viral DNA polymerase may be resistant to foscarnet and may not respond to therapy with foscarnet. The combination of foscarnet and ganciclovir has been shown to have enhanced activity in vitro.
Mechanism of actionFoscarnet exerts its antiviral activity by a selective inhibition at the pyrophosphate binding site on virus-specific DNA polymerases at concentrations that do not affect cellular DNA polymerases.
Route of administrationIntravenous
  • Acetates
  • Acids, Acyclic
  • Anti-Infective Agents
  • Anti-Retroviral Agents
  • Antiinfectives for Systemic Use
CAS number4428-95-9
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682