Why prescription drugs cost so much

From a $94,500 hepatitis C treatment to a melanoma drug running $12,500 a month, how are prescription drugs priced? And why can they cost $50,000 or $100,00, or more? We explain.

Why prescription drugs cost so much source: http://finance.yahoo.com/news/why-a-prescription-drug-costs--100-000-143041649.html