Touching/tapping compulsions

[Guest guest]

My 11-year-old son's compulsions involve touching/tapping objects,

walls, cars, the ground, etc. usually with both hands evenly, and

sometimes tapping objects with other objects (like cup to plate or

fork, etc. several times in a row). He also sometimes turns his head

to look over each shoulder an even number of times.

He's been on Zoloft 11 weeks (now up to 125mg/day) and therapy

w/clinical social worker, but we've not seen much improvement. He has

stopped flipping light switches and tapping tops of doorways, though.

Any suggestions?

Thanks!