LeanRX and xtremeRX appear to be one in the same. On my credit card they are both listed with the same phone number. I have gotten 2 unauthorized charges from LeanRX this month and one from xtremeRX phone number 866 882-3057. If you call however, they don't identify themselfs. All they do is ask for your credit card number and then they say that they will credit your account.
Dream Smile has also made unauthorized charges on my account this month.
When I discussed this matter with my credit card company they seemed to be aware of these companies and their activities.