Rapid growth for Pacira Pharmaceuticals' (NASDAQ:PCRX) time-release surgical painkiller Exparel is lifting profit as sales are leveraged against fixed costs, but a bigger opportunity may be ahead if the company can execute on plans to boost Exparel's addressable market. If so, the rapid run-up in Pacira Pharmaceuticals shares in October may be the start, rather than the end, for this company. 

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