Arimidex & High Fiber

I just started the 5-year medication Arimidex. It says to take after food to help prevent nausea. I have been taking it right after breakfast--my breakfast includes a generous serving of Fiber One, or probably 16-18 grams of fiber. Can the high fiber prevent or hinder the absorption of the Arimidex? I asked my oncology pharmacist and she wasn't sure.

As background, I was told once a long time ago not to take my birth control pill right after Metamucil for the reason that it might be flushed through with the Metamucil rather than absorbed. I don't remember if the doctor or the pharmacist told me that many years ago.

Thank you!