How does Doxycycline interact with milk / dairy products?

How soon after finishing the 21 day dosage are you allowed to eat cheese?

I'll offer you some advice on my experience with the same drug. I avoided dairy products and milk temporarily while taking this antibiotic. I didn't think it implied to completey stay away from milk/dairy, but rather to warn you that it reduces the absorption of the drug if you consume many dairy products on a daily basis. The best idea is to take it with water, and try to cut back on dairy until you are off of it. High consumption of dairy products would probably have a negative effect. Having a bowl of cereal once a day or a piece of cheese prob won't have any drastic effects on the absorption, but definitely don't overdo it. As for the protein powder, I'd temporarily lay off of that also. I use protein powder too and it stinks that I have no clue which drugs interact with the stuff. None of the drug websites say anything about the ingredients in whey protein (most have other ingredients so you should be careful) and their effect on other drugs. Good luck, perhaps a pharmacist will help ya out eventually with some more info.