I'm new to the group and was wondering if anyone has noticed the use of antihistamines (allegra, zyrtec, etc) exacerbating their child's compulsions/tics? My son was diagnosed last year so this is all pretty new to us still. He was occasionally shrugging his shoulders (compulsion/tic) while on zyrtec so the allergist switched him to allegra. After only 24 hours his compulsions have really increased. We're going to stop the allegra and see if it gets better. Has anyone else had an experience like this? Is there another way to treat their allergies? Thanks!