I received the coated 40mg oxycodone tablets for pain management but I found the 20mg coated ones were making me so high that I don't think I could handle the 40mgs for 12 hours. So I cut the 40s in half and put them away for when I need them. But I read up on this, out of anxiety. And see that it is a big risk. But why? And is it REALLY? And is there anyone else has done this and can explain why or why not it's OK to take them like this? I don't understand how cutting 40mgs into 20mgs can cause an overdose?