Amazon has been described has the "everything store," but it's missing one major category. And that's our prescription medicines.

But that might soon change, in the wake of Amazon's roughly $1 billion acquisition of PillPack, an internet pharmacy.

Health experts told CNBC that it's only a mater of time before Amazon starts selling prescription drugs on its online marketplace, and that it's assembling a team to do just that. For Amazon, pharmacy represents a multibillion market opportunity, but it's also highly complicated and will involve battling with some entrenched competition that has a vested interest in keeping drug prices high.

But Amazon, with its scale, leverage, and supply chain expertise, could be the company to do it, the experts said.