Subject: Are immunosupressants different than HIV?

My girlfriend is 16 and has cystic fibrosis.  She recieved a double lung 
transplant and is now immunosuppressed to avoid rejection.  It occured to me 
that being immunosuppressed is probably a lot like having the human 
immunodeficiency virus (HIV).  Can you tell me, if any, what the difference 
is.  Also, with cystic fibrosis, is the lung transplant, if rejection and 
infection do not occur, likely to extend her life to a normal human life 
span?  Or is she already on "borrowed time"?

P.S. I've done quite a bit of research and all sites seem to avoid the 
question of life span.

Re: Are immunosupressants different than HIV?