Speaking strictly from personal experience...
I began my Nizoral treatment right around the ending peak of my minoxidil shed, so the shed didn't come as alarming to me. Previously, every time I run my hand through my hair when I apply minoxidil liquid, the minoxidil shed will tag about 2 dozen strands of hair (thick and vellus) along with my hand. This phenomenon ceased upon continuous usage of Nizoral. Instead of the heavier minoxidil shed, my shedding pattern changed, instead of loosing everything, I noticed lot of my finer newly grown hair that I gained from minoxidil seem to shed everytime I shampoo with Nizoral. No reason to feel alarmed though, I presume this is because the hair I lost are entering a new hair cycle so I was very excited when this happened.
To give you an idea, I'd say my shed pattern went from a noticeable 2 dozen to about half a dozen on my hand each time I shampoo with Nizoral.