Antidepressants for lonliness? Are you wanting to drown out the lonliness or cure it with company? You either need something to help you numb the emotional pain OR something to help you get some company.
I had some prozac once and while it certainly had an interseting effect I can't say it'd cure lonliness. I think prozac is an SSRI. There's the herb, St. John's Wort which is a MAOI, it could help but be carefull, it can have some weird or dangerous effects that aren't in the warnings on the bottle. So look it up before trying it.
Have a chat to someone. Where I live there's a community health centre where anyone can talk to a counsellor for free. I found that place nice to visit once even though the counsellor couldn't really help.
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"Mundus vult decipi, ergo decipiatur" - Petronius