If you're looking for a way to permanently boost your passive income stream, you've probably seen Bristol Myers Squibb (NYSE: BMY) when you screen for stocks that pay big dividends.

At recent prices, the Big Pharma stock offers a 4.7% yield. Unfortunately, dividend payers rarely offer such high yields unless there are reasons to suspect they can't maintain their payout-raising streaks.

Let's look a little closer at why investors are worried about this drugmaker's dividend payout and what the company's doing to boost earnings over the long run.

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Source Fool.com