MY SON IS 13 Y.O. AND HAS TAKEN ABILITY AT

MY SON IS 13 Y.O. AND HAS TAKEN ABILITY AT 2mg a day for now about 2 years. i consider taking him off this drug to see how he does with a more natural type of treatment.
ABILIFY has helped him to buffer his highs/lows, due to a mild form of bipolar behaviour.
He was diagnosed initially with an anxiety disorder and mild depression.
is ABILIFY long term recommend?

thanks, h.