General:
* Enchanted
* Bewitched
* Hypnotized
* Mesmerized
* Captivated
* Enthralled
* In a trance
* In a daze
* Oblivious
* Under a charm
* In a fog
* Under a delusion
* Under the influence
More specific:
* Love spell: Smitten, infatuated, lovestruck
* Evil spell: Cursed, possessed, haunted, hexed
* Mental spell: Brainwashed, manipulated, controlled, subdued
The best alternative will depend on the specific meaning you are trying to convey.