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Title: Cidofovir  
Author: World Heritage Encyclopedia
Language: English
Subject: Viral disease, Human cytomegalovirus, BK virus, Gilead Sciences, List of antiviral drugs
Collection: Alcohols, Amines, Anti-Herpes Virus Drugs, Ethers, Gilead Sciences, Phosphonic Acids, Pyrimidones
Publisher: World Heritage Encyclopedia


Systematic (IUPAC) name
({[(S)-1-(4-amino-2-oxo-1,2-dihydropyrimidin-1-yl)-3-hydroxypropan-2-yl]oxy}methyl)phosphonic acid
Clinical data
Trade names Vistide
Licence data EMA:, US FDA:
  • AU: D
  • US: C (Risk not ruled out)
Legal status
Routes of
Pharmacokinetic data
Bioavailability complete
Protein binding <6%
Biological half-life 2.6 hours (active metabolites: 15-65 hours)


The above pharmacokinetic parameters are measured for cidofovir used in conjunction with probenecid.[1]
CAS Registry Number  Y
ATC code J05
PubChem CID:
DrugBank  Y
ChemSpider  Y
Chemical data
Formula C8H14N3O6P
Molecular mass 279.187 g/mol
Physical data
Melting point 260 °C (500 °F)
Specific rotation -97.3

Cidofovir (brand name Vistide) is an injectable antiviral medication primarily used as a treatment for cytomegalovirus (CMV) retinitis (an infection of the retina of the eye) in people with AIDS.[2][3]


  • Medical uses 1
    • DNA virus 1.1
    • Other 1.2
  • Administration 2
  • Side effects 3
    • Contraindications 3.1
    • Interactions 3.2
  • Mechanism of action 4
  • History 5
  • Synthesis 6
  • See also 7
  • References 8

Medical uses

DNA virus

Its only indication that has received regulatory approval worldwide is cytomegalovirus retinitis.[2][3] Cidofovir has also shown efficacy in the treatment of aciclovir-resistant HSV infections.[4] Cidofovir has also been investigated as a treatment for progressive multifocal leukoencephalopathy with successful case reports of its use.[5] Despite this, the drug failed to demonstrate any efficacy in controlled studies.[6] Cidofovir might have anti-smallpox efficacy and might be used on a limited basis in the event of a bioterror incident involving smallpox cases.[7] Brincidofovir, a cidofovir derivative with much higher activity against smallpox that can be taken orally has been developed.[8] It has inhibitory effects on varicella-zoster virus replication in vitro although no clinical trials have been done to date, likely due to the abundance of safer alternatives such as aciclovir.[9] Cidofovir shows anti-BK virus activity in a subgroup of transplant recipients.[10] Cidofovir is being investigated as a complementary intralesional therapy against papillomatosis caused by HPV.[11][12]

It first received FDA approval on the 26th of June 1996,[13] TGA approval on the 30th of April 1998[3] and EMA approval on the 23rd of April 1997.[14]


It has been suggested as an antitumour agent, due to its suppression of FGF2.[15][16]


Cidofovir is only available as an intravenous formulation. Cidofovir is to be administered with probenecid to help mitigate harm and decrease side effects to the kidney.[17] Probenecid works to mitigate nephrotoxicity by inhibiting organic anion transport of the proximal tubule epithelial cells of the kidney.[18] In addition, hydration must be administered to patients receiving cidofovir. 1 liter of normal saline is recommended in conjunction with each dose of cidofovir.[17]

Side effects

The major dose-limiting side effect of cidofovir is nephrotoxicity (that is, kidney damage).[19] Other common side effects (occurring in >1% of people treated with the drug) include:[2][19]

Whereas uncommon side effects include: anaemia and elevated liver enzymes and rare side effects include: tachycardia and Fanconi syndrome.[19] Probenecid (a uricosuric drug) and intravenous saline should always be administered with each cidofovir infusion to prevent this nephrotoxicity.[20]


Hypersensitivity to cidofovir or probenecid (as probenecid needs to be given concurrently to avoid nephrotoxicity).[2]


It is known to interact with nephrotoxic agents (e.g. amphotericin B, foscarnet, IV aminoglycosides, IV pentamide, vancomycin, tacrolimus, non-steroid anti-inflammatory drugs, etc.) to increase their nephrotoxic potential.[2][3] As it must be given concurrently with probenecid it is advised that drugs that are known to interact with probenecid (e.g. drugs that probenecid interferes with the renal tubular secretion of, such as paracetamol, aciclovir, aminosalicylic acid, etc.) are also withheld.[3]

Mechanism of action

Its active metabolite, cidofovir diphosphate, inhibits viral replication by selectively inhibiting viral DNA polymerases.[3] It also inhibits human polymerases but this action is 8-600 times weaker than its actions on viral DNA polymerases.[3] It also incorporates itself into viral DNA hence inhibiting viral DNA synthesis during reproduction.[3]

It possesses in vitro activity against the following viruses:[21]


Cidofovir was discovered at the Institute of Organic Chemistry and Biochemistry, Prague, by Antonín Holý, and developed by Gilead Sciences[22] and is marketed with the brand name Vistide by Gilead in the USA, and by Pfizer elsewhere.


Cidofovir can be synthesized from a pyrimidone derivative and a protected derivative of glycidol.[23]

See also

  • Brincidofovir, a novel prodrug of cidofovir that can be taken orally


  1. ^ Cundy, Kenneth C. "Clinical Pharmacokinetics of the Antiviral Nucleotide Analogues Cidofovir and Adefovir." Clinical Pharmacokinetics 36.2 (1999): 127-43.
  2. ^ a b c d e "Vistide (cidofovir) dosing, indications, interactions, adverse effects, and more". Medscape Reference. WebMD. Retrieved 4 February 2014. 
  3. ^ a b c d e f g h "Product Information VISTIDE®". TGA eBusiness Services. Gilead Sciences Pty Ltd. 3 September 2013. Retrieved 5 February 2014. 
  4. ^ Chilukuri, S; Rosen, T (Apr 2003). "Management of acyclovir-resistant herpes simplex virus.". Dermatologic clinics 21 (2): 311–20.  
  5. ^ Segarra-Newnham M, Vodolo KM (June 2001). "Use of cidofovir in progressive multifocal leukoencephalopathy". Ann Pharmacother 35 (6): 741–4.  
  6. ^ De Gascun, C. F.; Carr, M. J. (2013). "Human polyomavirus reactivation: Disease pathogenesis and treatment approaches". Clinical and Developmental Immunology 2013: 373579.  
  7. ^ De Clercq E (July 2002). "Cidofovir in the treatment of poxvirus infections". Antiviral Res. 55 (1): 1–13.  
  8. ^ Bradbury, J (March 2002). "Orally available cidofovir derivative active against smallpox.". Lancet 359 (9311): 1041.  
  9. ^ Magee, WC; Hostetler, KY; Evans, DH (August 2005). "Mechanism of Inhibition of Vaccinia Virus DNA Polymerase by Cidofovir Diphosphate" (PDF). Antimicrobial Agents and Chemotherapy 49 (8): 3153–3162.  
  10. ^ Araya CE, Lew JF, Fennell RS, Neiberger RE, Dharnidharka VR (February 2006). "Intermediate-dose cidofovir without probenecid in the treatment of BK virus allograft nephropathy". Pediatr Transplant 10 (1): 32–7.  
  11. ^ Broekema FI, Dikkers FG (August 2008). "Side-effects of cidofovir in the treatment of recurrent respiratory papillomatosis". Eur Arch Otorhinolaryngol 265 (8): 871–9.  
  12. ^ Soma MA, Albert DM (February 2008). "Cidofovir: to use or not to use?". Curr Opin Otolaryngol Head Neck Surg 16 (1): 86–90.  
  13. ^ "Cidofovir Monograph for Professionals -". American Society of Health-System Pharmacists. Retrieved 5 February 2014. 
  14. ^ "Vistide : EPAR -Product Information" (PDF). European Medicines Agency. Gilead Sciences International Ltd. 7 November 2013. Retrieved 5 February 2014. 
  15. ^ Liekens S, Gijsbers S, Vanstreels E, Daelemans D, De Clercq E, Hatse S (March 2007). "The nucleotide analog cidofovir suppresses basic fibroblast growth factor (FGF2) expression and signaling and induces apoptosis in FGF2-overexpressing endothelial cells". Mol. Pharmacol. 71 (3): 695–703.  
  16. ^ Liekens S (2008). "Regulation of cancer progression by inhibition of angiogenesis and induction of apoptosis". Verh. K. Acad. Geneeskd. Belg. 70 (3): 175–91.  
  17. ^ a b
  18. ^ Lacy, S. "Effect of Oral Probenecid Coadministration on the Chronic Toxicity and Pharmacokinetics of Intravenous Cidofovir in Cynomolgus Monkeys.
  19. ^ a b c Rossi, S, ed. (2013). Australian Medicines Handbook (2013 ed.). Adelaide: The Australian Medicines Handbook Unit Trust.  
  20. ^ "Vistide (cidofovir)" (PDF) ( 
  21. ^ Safrin, S; Cherrington, J; Jaffe, HS (September 1997). "Clinical uses of cidofovir". Reviews in Medical Virology 7 (3): 145–156.  
  22. ^ "Press Releases: Gilead". Retrieved 2007-12-05. 
  23. ^ Brodfuehrer, P; Howell, Henry G.; Sapino, Chester; Vemishetti, Purushotham (1994). "A practical synthesis of (S)-HPMPC". Tetrahedron Letters 35 (20): 3243.  
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