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Benicar and Diarrhea. Side effects of the blood pressure medication Benicar may include sprue-like enteropathy, a gastrointestinal disorder that causes diarrhea and other unpleasant complications.
However, research surfaced linking Benicar and other olmesartan-based drugs to severe gastrointestinal side effects. In April 2014, this research led the FDA to rule that Benicar needed a warning on its label stating olmesartan medoxomil was associated with specific and significant gastrointestinal side effects.