... noticed I was starting to itch. This was perscribed for high blood presure. I was taking another drug but when I switched insurance they did not cover the drug I was taking which was Benicar I belive. Us itching a side effect. it seems to be getting worse and spreading to other parts of my body. since I am on vacation I have had a one margarita a day on 3 different days but they were spaced a day or even a couple days apart. could this have caused the itching to start?