Hi, so I'm a new grad and I've been on the floor for about 3 months. Today, I gave Dilaudid to a pt and I was in a rush...which I know is inexcusable for my mistake. Pt had an unwitnessed waste from previous shifts (not mine) so it also added to my confusion. But anyways, MAR said 0.2 mg but I thought it said 0.4 mg and I showed my witness wasting 0.6 which she typed 0.6 in the Pyxis. I got to pt's room, scanned the med & it said 0.2 mg. That's when I realized oh crap, I had 0.4, but I was in such a rush because the Pa-C was asking it for it quickly and my break relief RN was bugging me to go on my break, it slipped my mind that I needed to grab my witness and waste 0.2. I ended up wasting it in the biohazard bag in the room myself...and administered the correct 0.2 to the pt. The Pa-C was there when I gave it to the pt but didn't see me wasting it because he had the curtain drawn.. Then I forgot about the whole event during my shift and I just remembered. I'm now anxious that it will affect my license or my job due to my careless mistake. Do I need to talk to my manager tomorrow? The problem is that no one saw me wasting that extra 0.2 mg that I had in my syringe. I've never used or experienced any drugs!