Take whatever you need. The Dr has prescribed a certain dose so you are safe taking what he said. I truely do not believe we get "addicted" to the pain meds. I might go a few days without anything then have to take 2 in the morning to just walk without pain, a couple in the afternoon and at times at bedtime so I don't wake up in pain.
Do not wait til the pain is bad, it takes longer for the meds to work. Most people get used to their dose and can function fine after a few weeks. I drive without any problems.
Good Luck, Cindy