Medicine

Hey guys, I am just curious about something. Recently I had my mom 'borrow' some of my medicine and use it herself. I found out this morning, and called her on it. She said she had every right to take it because she needed it, and she was going to replace it. I was completely pissed off, and told her that under no circumstances should anyone take anyone else's medicine, and I got called selfish and told that I was overreacting, and she did nothing wrong. I guess what I am saying is do you guys think it's okay to take someone else's medicine as long as you will replace it? And any parents on here, would you do that to your kids knowing your kid needed it? And if you guys think I am overreacting tell me, I just can't fathom that my mom would do this, because she needed the medicine for herself and couldn't care less that I needed it, and it was my prescription. And the funny thing is, if she would have talked to me, and asked for some I would have given it to her....