I have been using Vicodin for about a year, three per day was my limit. They became ineffective. I asked my dr to switch them he said no he didn't want me to be on a narcotic 2. The vicodin felt like I took a advil or something. Now a new doctor gave me percocet 500, I am wondering if I take these for awhile if i can go back to vicodin and they will work again????? Or if they are about the same?