Shares of Eli Lilly (NYSE:LLY) lagged the broader market in 2013 by a wide margin. While some investors may see this as an opportunity to jump into a sector filled with sky-high valuations, it's important to first weigh both the pros and cons of this particular stock. In the following video, analyst Max Macaluso focuses on one headwind, namely the affect of the "patent cliff" on Lilly's top and bottom lines, and one tailwind, the drugs Lilly is developing, that will have huge impacts on the stock this year.

Max Macaluso, Ph.D. has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. 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.