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Check out the companies making headlines in premarket trading. Pfizer -- Shares dropped 4.2% after the drugmaker said it would halt development of its twice-daily experimental weight-loss pill. Pfizer said patients in a mid-stage clinical study reported high rates of adverse side effects. It still plans to release trial...

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Pfizer to discontinue twice-daily version of weight loss pill

CFOTO | Future Publishing | Getty ImagesPfizer on Friday said it would stop developing the twice-daily version of its experimental weight loss pill after obese patients taking the drug lost weight but had trouble tolerating the drug in a mid-stage clinical study. The drugmaker observed high rates of adverse side...

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