Hi there, I don't know what citrucel is (we don't have a wide variety of drugs and supplements over here...) I tend to wait about (at least) 30 minutes after I've finished a meal to have a cup of tea. Note: I am C and find that this diet doesn't provide enough insolubles for me, which might be why I tolerate the fennel bulb well. Just a note for Khrycat (sp?) who mentioned that it was difficult. Amazing how similar we are but still different...