There are pros and cons to investing in biotech stocks. One of the advantages is that shares of drugmakers can explode in a short period, especially following regulatory or clinical wins. On the other hand, the industry tends to be volatile, which may not suit some people's investment styles.

Even so, there are great biotech companies out there that are worth stashing in your portfolio for years, even if they go through volatile periods. Let's look at two examples: Axsome Therapeutics (NASDAQ: AXSM) and Exelixis (NASDAQ: EXEL).

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Source Fool.com