<human>: Can you condense the text into a few key points?

Some backstory: She went to another country this semester for a study abroad program. About a month into the trip she starts getting really mean, fighting with me all the time, etc. I come to find that she'd been drinking all day every day and I attributed her behavior to that. She came home last weekend. When I hung out with her, she told me I should go outside and smoke some weed but that she wouldn't come. When pressed, she revealed that she wanted to stay inside and snort a Vicodin.

I don't know how long exactly this has been going on. Long enough to be habit-forming, at least. I'm pretty concerned for her physical and mental health right now.

I looked up Hydrocodone and it's effects on the internet, but I mostly just got articles related to purely medicinal uses. I was wondering if you guys could give me any information as to what she's going through, the drugs effects on her in the long and short term, and what I can do to help.
<bot>: My best friend is on Vicodin. I need all the information/advice I can get my hands on.