I have heard what Trav said - stay away from dairy when taking doxy - but only 2 hours before and 2 hours after. I am on doxy so I don't have dairy for breakfast or at bedtime, but I do have it for lunch and dinner. Jay Robb has egg protein shakes that are not dairy - I think. Eggs come from a chicken not a cow - you may say "Well Duh...." but I considered eggs to be dairy until about
2 months ago.
I would not drink the whey protein at breakfast because that is dairy, but maybe the egg protein or soy protein shakes will be safe?