Outpatient commitment opponents make several varied arguments. Some dispute the positive effects of compulsory treatment, questioning the methodology of studies that show effectiveness. Others highlight negative effects of treatment. Still others point to disparities in the way these laws are applied. The psychiatric survivors movement opposes compulsory treatment on the basis that the ordered drugs often have serious or unpleasant side-effects such as anhedonia, tardive dyskinesia, neuroleptic malignant syndrome, excessive weight gain leading to diabetes, addiction, sexual side effects, and increased risk of suicide.