I don't use revolution but I do use advantage for my cats. I buy the largest dog advantage and then I measure it out according to the weight of my cats. I do rinse and reuse the syringes. You need to put surgical tape or any other kind of tape to mark them because I do know that the numbers will fade with time. I use surgical tape. I just use two doses of .4ml for cats 8lbs and under and .8ml for cats over 9lbs. Most of my cats are over 9lbs. I also squirt the advantage in about 4 spots behind the neck area. I found that if you squirt the whole thing in one spot that this will cause irritation and sometimes hair loss in cats.
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