Is Clonidine effective for PTSD?

Can be. There is no one med that is best for PTSD. Clonidine used alone or in combination with other medications may be helpful for symptoms of PTSD. PTSD treatment should include psychotherapy which may be one of several different types. See: http://www.nimh.nih.gov/health/publications/post-traumatic-stress-disorder-ptsd/nimh_ptsd_booklet_38049.pdf.