Canada Unites Against Pfizer

In this video, Motley Fool Health-Care Analyst David Williamson breaks down just what happened in the recent Canadian Supreme Court ruling against Pfizer (NYSE: PFE  ) . The Canadian patent on the company's drug Viagra was due to expire in 2014, but the Court struck down the patent in a unanimous ruling, invalidating the patent. Williamson explains the losers and the winners in this situation, and just how much we can expect Pfizer to really be affected.

While you can certainly make huge gains in biotech and pharmaceuticals by keeping abreast of major news developments, like Pfizer's situation, the best investing approach is to choose great companies and stick with them for the long term. In our free report, "3 Stocks That Will Help You Retire Rich," we name stocks that could help you build long-term wealth and retire well, along with some winning wealth-building strategies that every investor should be aware of. Click here now to keep reading.