Lomibuvir, also known as VX-222, VCH-222 and VX22, is an nonnucleoside NS5B polymerase inhibitor. VX-222 inhibits the 1b/Con1 HCV subgenomic replicon, with 50% effective concentrations (EC(50)s) 5 nM. VX-222 binds to the HCV polymerase with dissociation constants of 17 nM. In phase 1 and 2 clinical studies, VX-222 demonstrated effective antiviral efficacy, with substantial reductions in plasma HCV RNA in patients chronically infected with genotype 1 HCV.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.