I take 10/325 Percocets. 1 1/2 every 4 hours. So basically 9 within a 24 hour time frame and was now prescribed 20 mg. oxycontins. How does this medicine work? Do I take it with my Percocet or do I have to wait for a while before taking my Percocets? I don't want to overdose, it scares me. I am thinking that I should take one Oxy at night before bed and one when I wake up and the rest of the day, just take my percocets. Is this what I am suppose to do. And what is this time released, how long does it really last?