great for litter boxes by Julius1944 from Ohio10/19/2011
I have 5 rescue cats, and maintain 6 very large litter boxes, with various types of litter. I've found that if I empty a couple of capsules of doxycycline in the litter, it really helps to control odor.
Doxycycline for litter boxes by Julius194401/02/2012
I use recycled newspaper litter, and due to my cat's age, I have to keep a litter box in the kitchen. I open 2 capsules of doxycycline and mix the powder with the fresh litter, and it controls the urine odor for a week. This is a simple solution to what was a really big problem.