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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.
Expert: Denver ER Doc replied 5 years ago. Vomiting and diarrhea are not among the listed side effects of phenylpropanolamine (Proin), however it can cause restlessness and decreased appetite which may result in vomiting, GI upset, and possibly diarrhea.