Amazon has been described has the “everything store, ” but it’s missing one major category – prescription medicines. 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.

People buying medical supplies on Amazon, such as glucometers and cold medicine, can now use their flexible savings accounts or health savings accounts to get discounts.

These programs, often referred to as an HSA or FSA, allow people wit…