Question About Fiber Supplements (Citrucel,Benefiber)

i wanted to know if either citrucel or benefiber affected the absorption of other medication i know psyllium does

if so which one or does both? and how far apart from medicines should i take it?

I would guess a few hours between taking medicine and fiber is enough to make sure there aren't any issues. For some medicines that are supposed to be taken on an empty stomach, I think it's often recommended to take the medicine at least one hour before eating or two hours after eating. (Does that sound about right?)