Benicar Side Effects. What are the side effects of the high blood pressure drug olmesartan (trade names: Benicar in the US, Olmetec in EU and Canada, WinBP and Golme in India, and Erastapex in Egypt)? The National Library of Medicine lists dizziness, swelling, hoarseness, and breathing/swallowing difficulty as the most common side effects.
However, a new study by Mayo Clinic gastroenterologist Dr. Joseph Murray found that some patients who took the drug reported gastrointestinal disorders such as diarrhea, vomiting, severe nausea, and weight loss which are symptoms of celiac disease. These disorders reportedly disappeared when the patients stopped taking in olmesartan.