Why are prescription drugs so expensive in the U.S., relative to other countries? And why is there so little transparency around cost?

Tensions are flaring up about this question in Washington D.C after a series of high-profile cases, like the skyrocketing cost of a lifesaving allergy medication. And consumers are bearing more of these costs now with the rise of high-deductible health plans.

There are a lot of reasons why drugs are so costly, ranging from the U.S. government's lack of negotiating power and the lack of competition among drug makers.

It's complicated, but we broke it down for you with the help of health industry expert and entrepreneur Stephen Buck.