It was similiar to ReGenesis with the atmosphere of X-Files and Millenium. If I remember correctly, the lead character was a scientist who'd been infected by some sort of virus and a secret faction was helping him find a cure (or held it over his head) in return for favors. I think that he was investigating something in each episode. The only other thing I remember is that in the intro to the show, there was a pill.
Ring any bell? Any help is appreciated.