The Food and Drug Administration recently granted Gilead Sciences (GILD -2.55%) priority review for its much-awaited hepatitis C drug sofosbuvir. Current treatments are far from perfect for the 3.2 million people suffering from chronic forms of the disease. This novel oral therapy has a lot going for it, which has some analysts thinking it could potentially hit $5 billion in peak sales. In the following video, Fool contributor Maxx Chatsko explains how Gilead's drug raises the bar for the future of hepatitis C treatment.