I've had good luck with Feliway. It doesn't stop all bad behavior but it does seem to curb it. One thing I've noticed is I have to stop using it after a couple of months because they seem to get used to it and it almost has an opposite effect on them. Usually after a month off it works again.
I buy my refills from this place. It's the cheapest I've found and shipping is reasonable.
discount pet supplies
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