Since how long he has been suffering from major depression?
Since when he started taking celexa and what dose ?
Any other medicine besides this , is he on?
Well instead of celexa , you should consult your doctor and ask him to put your fiance on Venlafexine and Trazadone (BOTH ARE GOOD ANTIDEPRESSANTS FOR MAJOR DEPRESSIVE DISORDER) combination along with buspirone (anti anxiety) .
THE DOSE AND THE DURATION should be decided by your doctor, also celexa should not be discontinued abrubtly but its dose should be tapered slowly.
I hope my answer is of any help for you.
Wish your fiance and you good health.
PLEASE PRESS THE ACCEPT BUTTON IF YOU FEEL SATISFIED WITH MY ANSWER AND KINDLY CARE TO LEAVE A POSITIVE FEEDBACK