<human>: It has become evident that a lifelong friend of mine has developed an addiction to "roxys" or "oxys", a drug that I am not familiar with in the slightest, however I do understand the danger involved in addiction.  He has spent the last 4 years in Uni, every time I saw him over holidays he looked worse than the last.  In high school he was very social, athletic, and somewhat smart.  Now all of those qualities have deteriorated.  He thinks that nobody is aware of his addiction.  Is there an effective way I can go about helping him or seeking help for him?  Or is it best to let his family help?  Any input would be appreciated.

Summarize the given text in a few sentences.
<bot>: My friend is addicted to a serious drug, looking for advice on how to help him.  He thinks nobody knows of his addiction.