It is an oligonucleotide that blocks translation of viral mRNA by binding to a coding segment of a key CMV gene. It was the first antisense antiviral approved by the FDA.[1]
It is available as an intraocular injection in a concentration of 6.6 mg/ml[2]
References
^ Roush, W. 1997. Antisense aims for a renaissance. Science 276: 1192-93
^ Katzung, BG. Basic and Clinical Pharmacology 10th ed., 2007. McGraw-Hill Co., Inc.
Geary R, Henry S, Grillone L (2002). "Fomivirsen: clinical pharmacology and potential drug interactions.". Clin Pharmacokinet41 (4): 255–60. PMID 11978144.
"Randomized dose-comparison studies of intravitreous fomivirsen for treatment of cytomegalovirus retinitis that has reactivated or is persistently active despite other therapies in patients with AIDS." (2002). Am J Ophthalmol133 (4): 475–83. doi:10.1016/S0002-9394(02)01326-0. PMID 11931781.
Roehr B (1998). "Fomivirsen approved for CMV retinitis.". J Int Assoc Physicians AIDS Care4 (10): 14–6. PMID 11365956.