Benicar is used to treat hypertension, or high blood pressure. In 2013, the FDA issued a safety announcement linking the drug to severe intestinal problems. In 2013, the FDA issued a safety announcement linking the drug to severe intestinal problems. Thyroid drugs (thyroid hormones) are used to supplement low thyroid levels in people with hypothyroidism. Hypothyroidism is a condition in which the thyroid gland does not produce enough thyroid hormones to meet the needs of the body. Can Benicar cause Thyroid Problems? Complete analysis from patient reviews and trusted online health resources, including first-hand experiences. The hypertension drug Benicar has been linked to a number of reports involving serious gastrointestinal side effects, producing symptoms typically associated with celiac disease, which may result. Thought it was thyroid related but think the benicar is the culprit. I am allergic to sulpha so maybe that is a factor. It was great till now. I am allergic to sulpha so maybe that is a factor. It was great till now. Can Benicar cause Hypothyroidism? Complete analysis from patient reviews and trusted online health resources, including first-hand experiences. Complete analysis from patient reviews and trusted online health resources, including first-hand experiences. Summary. Thyroid disorder is found among people who take Benicar, especially for people who are female, 60+ old , have been taking the drug for 5 - 10 years, also take medication Synthroid, and have High blood cholesterol. Communities Thyroid Disorders Does Benicar (Olmesartan) reduces hypothyroidism or worsens hyperthyroidism? Aa. A. A. A. Close Thyroid Disorders Community 25.9k Members Does Benicar (Olmesartan) reduces hypothyroidism or worsens hyperthyroidism? youngandold. I was just diagnosed with T3 hyperthyroidism. Benicar almost gave me a heart attack on the first dose, only 20 mg. Does it worsen. I take Benicar , and I would like to know if it is a blood thinner? I am wanting to get a tattoo, and one of the things they told me was if you are taking a blood thinner, I would have problems. Benicar (olmesartan). Sankyo Parke Davis, Parsippany, NJ. Sankyo Parke Davis, Parsippany, NJ. Abdelrahman AM, Burrell LM, Johnston CI Blockade of the renin-angiotensin system at different sites: effect on renin, angiotensin and aldosterone. .