Alcohol Addiction, how to respond

I have a friend who is addicted to alcohol. He is intelligent, he is well spoken, he is only 50-60. Being vague on purpose here. What I would like to know is how do you help people such as this to get back on the track? He has got so that he does not seem to care about anything anymore and will not even get dressed in a morning because he 'doesn't see the point'. He has had many reactions to this in the form of swelling, rashes, depression, although he has nothing to feel depressed about really. What would you suggest that might help? He is already hiding bottles and telling people he has stopped drinking. Any suggestions gratefully received.