Table 5.

Cytotoxicity of PM-523 and ribavirin did not increase by their combined use

Concentration (μM)
PM-523	Ribavirin	Percent viability of cells a
100	0	81.1 ± 2.9
200	0	89.3 ± 5.8
400	0	85.2 ± 3.5
0	100	107.2 ± 1.7
0	200	104.8 ± 3.8
0	400	102.8 ± 4.1
100	100	81.4 ± 3.8
100	400	66.8 ± 3.6
200	200	85.4 ± 3.8
400	100	79.2 ± 6.5
400	400	65.5 ± 9.3

^aViability of cells was determined by MTT method. Viability of the cells which were not treated with compounds was estimated as 100%.