Celexa and Sensory Processing Disorder

My son is two and was recently prescribed a very small dose of Celexa for his SPD. It has really seemed to help. He seems much more open to things and less frustrated. Without the medication he became easily frustrated which led to many temper tantrums. On the medication, frustration and temper tantrums is rarely an issue. So the medicine is obviously doing something to calm his nervous system.

My question is, are any of you using this with your children? If so, what has been your experience? I don't know of anyone else in my community who has utilized this medication for this disorder. We received the prescription while out of town at a feeding disorder clinic. I would just love to hear from others who have had it prescribed for their child and what your experience was as well as how long they have been on it.