I Am About To Start Taking Apo-Rabeprazole For Reflux, I

I am about to start taking Apo-Rabeprazole for reflux, I also had a gastroscope done a few weeks ago and was told I had some inflammation in my esophagus and a little inflammation in my stomach.
I am on mag forte tabs, plus 600mg potassium vitamin D 1000 iu,
I also have a Ileostomy and have been slightly defficient in these minerals.
When would be the best time to take Apo-Rabeprazole, before food or after?.
Regards
Stephen.