Bristol-Myers Profit Down, So Are Shares  NEW YORK (Reuters) - Bristol-Myers Squibb Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=BMY.N target=/stocks/quickinfo/fullquote"&gt;BMY.N&lt;/A&gt; on  Friday said quarterly profit fell 16 percent on special charges  and lower U.S. sales amid competition from rival brands and  cheaper generics.