This document discusses Olysio, a drug for treating Hepatitis C. It provides an overview of Hepatitis C, details on Olysio including its efficacy and financial performance, and potential future barriers to growth. Clinical trials showed Olysio in combination with other drugs achieved a 80% cure rate compared to 50% for the control group. Olysio generated $725 million in sales in Q2, beating forecasts. However, competition from other new Hepatitis C drugs and the high cost of treatment pose threats going forward.