This study will investigate the effect of paliperidone ER (in combination with or without benzodiazepines) in patients presenting with symptoms of agitation and/or aggression in the context of psychosis, and will generate data regarding both efficacy and safety in the acute setting.

Psychomotor agitation that requires hospitalization is a common event during the course of certain major psychiatric disorders, including schizophrenia. Emergency psychiatric services are the first doorway for the control of agitation and behavioural disturbances of the mentally ill in order to avoid dangerousness and aggression towards themselves and/or others. The use of drugs that influence the psychological behaviour (psychotropic drugs) should help to handle agitation and aggression, rapidly rendering people calm and/or sedated without producing distressing or dangerous adverse events, and facilitating extended assessment and definitive treatment. Oral atypical antipsychotics, alone or in combination with a benzodiazepine, are considered first line treatment for patients who present at the emergency ward with mild to moderate psychotic agitation. Paliperidone is a new atypical antipsychotic therapeutic agent for the treatment of schizophrenia. Paliperidone extended release (ER) might be considered as a treatment option for patients presenting with agitation and/or aggression (in combination with short term use of benzodiazepines) because of its fast onset of action and limited or no long term sedating effects. This open-label, single arm, multicenter, interventional descriptive study will collect data on efficacy and safety during first days of treatment with paliperidone ER in patients with acute agitation in the context of psychosis in the psychiatric emergency setting. The assessment of effectiveness/response will be based on Positive And Negative Syndrome Score Exciting Component (PANSS-EC) improvement. Safety evaluations include the incidence of serious and non-serious adverse events. The study will end after 5 days of treatment or at day of discharge from the hospital, whatever comes first. 6 mg (patients with an acute exacerbation of schizophrenia in a real-world setting an initial dose of paliperidone 9 mg once daily may provide optimal clinical efficacy with good tolerability) tablet, oral, once a day during the study duration (5 days).

Inclusion Criteria:

Patient presenting with acute agitation and/or aggression in the context of psychosis, suspected schizophrenia PANSS-EC score >=20 Patient is outpatient in need of hospitalization female patients of childbearing potential must have a negative urine pregnancy test at baseline and further adequate anticonceptive protection signed informed consent

Exclusion Criteria:

Received benzodiazepines 4 hours prior to enrolment Received antipsychotic medication 72 hours prior to enrolment agitation, aggression or violent behaviour that necessitates the use of intramuscular or intravenous medication Patient's preference for intramuscular or intravenous medication Patient judged to be at high risk for suicidal behaviour Pregnant or breast feeding females Patient received clozapine or long-acting injectable antipsychotic during the last 3 months Serious unstable medical condition, including known clinically relevant lab abnormalities History of current symptoms or tardive dyskinesia History of neuroleptic malignant syndrome Participation in an investigational drug trial in the 30 days prior to selection Inability to swallow the study medication whole with the aid of water (chewing, dissolving, dividing or crushing the study medication is not allowed) Patients with a narrowing or blockage of their gastro-intestinal tract Patients with current or known history (past 6 months) of substance dependence according to DSM-IV criteria known hypersensitivity to paliperidone ER or risperidone Employees of the investigator or study centre, persons with direct involvement in the proposed study or other studies under the direction of that investigator or study centre, or family members of the employees or the investigator