... hour before or 4-6 hours after this medication. My routine is to take all my meds and vitamins at once after I eat my first meal of the day. I then take a scoop of prevalite with a scoop of psyllium seed husk (same stuff that's in metamucil) in a large glass of water. I then take the previlite and psyllium after other meals. Now I find out I shouldn't take medications with this stuff. Any idea what's so bad about it?