Hi, Benicar contains olmesartan that belongs to the group of antihypertensive medications known as angiotensin receptor blockers or ARBs is used in the treatment of hypertension and in the prevention of strokes, heart attacks, kidney problems etc., by lowering blood pressure. It is a safe and effective medication for controlling high blood pressure. Consumers of Benicar may notice improvements in their blood pressure within two weeks of starting this medication. But like any other medication this medication has some side effects of its own. If someone experiences any side effect when taking this medication or this medication becomes failed to control his or her blood pressure, then he or she should consult the prescribing doctor immediately. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician