I take Buspar for the IBS. The lightheadedness didn't bother me too much. And when things were bad I took bother Buspar and Levbid (a different antispasmodic from Bentyl) and the combo helped me be functional.I did gut-directed CBT for my IBS and it made a big difference for me.K.------------------I have no financial, academic, or any other stake in any commercial product mentioned by me.My story and what worked for me in greatly easing my IBS: http://www.ibsgroup.org/ubb/Forum17/HTML/000015.html