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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.
Taking iron supplements can cause chest pain, headache, a metallic taste in your mouth, nausea, and more. Taking Pepto-bismol (bismuth) Side effects of medications with bismuth include black stool and a black tongue. Giardiasis. Giardiasis is an infection of the small intestine causing diarrhea, gas, bloating, nausea and stomach cramps. Hyperthyroidism