Amazon has now launched a pharmacy integrated right into the Amazon site. Of course, this was ex- pected after Amazon purchased PillPack a couple of years ago. How it works: even if you have an Amazon account, you must sign up for a pharmacy account. But they say it only takes 5 minutes. Afterward you can load up your prescriptions (Amazon will even contact your prescriber for you, if needed) and then the site offers cost comparisons with your prescription drug benefits and without. Amazon pharmacy works with Medicare, Medicaid and most prescription drug plans. If you choose to pay cash and you’re a Prime member, however, you’ll be offered discounts and you get free two-day delivery. Oh, and you might guess what happened after the launch. Yep, shares fell significantly for CVS, Walgreens Boots, GoodRx and drug distributors Cardinal Health and McKesson.”