I have been splitting Advantix for some time now.....at the suggestion of my Vet at the time. He did say that Bayer would not approve this action but in his opinion there was no issue with it at all.
To date, I have not had any issues.
I should also add that it is his opinion that it is better for his clients to protect their pets with this coverage than for them to not buy any due to the cost of buying multiple packs.
I am not sure if it was a regular practice of his or not.
EDIT
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