In order to buy Cozaar, a local doctor's prescription is required. This is due to the fact that it is a controlled substance and may have a variety of associated side effects. Some of those side effects could include the feeling of being lightheaded or disoriented, painful urination, pain in the chest, numbness throughout the body, pallor of the skin, and swelling in the extremities or a slowed heart rate. In addition, some minor side effects that can take place when you buy Cozaar online could include sinus problems, pain in the muscles of the back or legs, diarrhea, or difficulty in sleeping.