Amazon has several hurdles to jump before it could enter pharmaceuticals (AMZN)

The pharmaceutical market has the potential to be incredibly lucrative for Amazon, but only if it can get a foot in the door.
According to a Morgan Stanley note sent out to clients on Thursday, US prescription sales were a $465 billion industry in 2016 with $106 billion coming from mail orders. Finding a way into the market would increase Amazon's potential US revenue by 20%.
But even if reports are true that Amazon is looking to break into the prescription sales busines