Although Vertex (NASDAQ:VRTX) is still up 20% for the year as a whole, it dropped by about a fifth of its share price in November. The stock has been hit twofold. Results keep pouring in from both Abbott Labs' (NYSE:ABT) and Gilead's (NASDAQ:GILD) next generation hepatitis-C drug cocktails, with tremendous cure rates and without requiring the use of interferon -- you start to see the problem for Vertex's Incivek. Furthermore, quarterly results had sales of its cystic fibrosis drug coming in light of estimates, but international expansion should accelerate its growth. Watch and find out what David Williamson thinks about Vertex's month and what the future holds for the stock.

David Williamson has no positions in the stocks mentioned above. Follow him on Twitter @MotleyDavidMax Macaluso has no positions in the stocks mentioned above. The Motley Fool owns shares of Vertex Pharmaceuticals. Motley Fool newsletter services recommend Gilead Sciences and Vertex Pharmaceuticals. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.