What kind of treatments does an alcohol rehab center provide?

Can you answer Goku’s question about Addiction?:

Hi,

I was wondering what an usual alcohol rehab center does to treat the alcoholics? Are they expensive? Do they contain mostly drugs? If there are some therapeutic treatments (which I heard), what are they? I would appreciate if you could provide me with more details on these because that will help me see if sending my friend down to a rehab center is the best solution. Thanks.

How To Detox From Alcohol