Watch it again. He mentions the pills and headaches.
He talks about the headaches and that it might have something to do with the headlights. Jason asked him "what is Treadstone?", Clive's character says, "It's the pills, they said go to paris." and doubles over in pain.

Yet, in the first Bourne movie the asset (Clive Owen) that came after Bourne at the end of the film mentioned the headaches from the pills after Jason shot him in the field. I always assumed that was from some sort of program enhancement.