I am working of fragments based drug design, and have obtained promising Lead inhibitor. I am looking for calculation of IC50 values. Is there any method to determine IC50 values using in-silico approach?.
IC50 values cannot be determined directly with in-silico approach.
However, if you have a significant number of other compounds or molecules, with practical IC50 values, against the same target, that information can be used in a QSAR study to predict the IC50 value of your Lead.
I agree with Uddipta. You can use an in silico method for a hypothetical prediction, however you need to conduct in vitro/ in vivo studies to validate the obtained computational results.