That is one of the things the DP is still griping about from three shows ago. How Robo Cop - (practically dead from all the torture) manages to jump up, stab Tony with the meds and race out of CTU when he isn't supposed to be able to walk for three days.
Oh, well.
Doesn't bother me.
OTOH remember the one where Jack was tortured and he fine a half hour later.
One of the prevailing theories is that there were no meds in the cocktail and Robo was faking.