Hello and thanks for your query. I understand that you are concerned about your daughter s recent anxiety problems. Now, anxiety disorders are a common co-morbidity in persons with mental retardation and autistic spectrum disorders. From your description, it appears that your daughter is now having a relapse in her anxiety symptoms after coming of the Neurontin. Regarding your question about other anti-anxiety medication, SSRIs like Escitalopram, Sertraline, etc. are effective and safe anti-anxiety agents. They are use as first-line medication in the teratment of a variety of anxiety disorders and can be given on a long term basis without risk of habituation or dependence. In persons with mental retardation / autism, who present with agitation, self-harming behaviour, etc. low doses of antipsychotics like Risperidone or Quetiapine can also be helpful. So, I would suggest that you discuss about these options with her treating doctor so that the appropriate medication can be started. Best wishes.