Frequent Request of Injectable Biperiden in a Young Patient with Uncommon Neck Deviation and History of Neurodevelopmental Disorder

Introduction: Malingering is a differential diagnosis in the field of medical disorders, especially in the field of forensic medicine. In medicine, malingering is when a person imitates a medical or psychiatric disorder with external motivations to gain financial gain or avoid social or occupational duties. In some cases, diagnosing a medical or psychological condition from malingering can be challenging and difficult. In this case report, a patient with a history of multiple hospitalization, neurodevelopmental disorders, and intellectual disability requested to receive injectable Biperiden due to aggression, irritable mood, and neck deviation, and in order to receive it, he deliberately showed neck dystonia. This report aimed to discuss on a neuropsychiatric symptom, after which the patient requested a drug injection to resolve it, in order to differentiate possible diagnoses such as drug complication, factitious disorder, and functional neurological symptom disorder. On the other hand, during the recent searches of similar texts, conflicting results and suggestions have been presented.