The purpose of the study is to show that risperidone (an antipsychotic medication) combined with lorazepam (an anti-anxiety medication) is more effective than conventional therapy administered by intramuscular injection for emergency treatment of patients with schizophrenia.

Patients with acute schizophrenia are often anxious and uncertain because of the psychotic symptoms they are experiencing. These patients are in need of rapid help and symptom relief. Risperidone, a widely used antipsychotic medication, is effective against positive and negative symptoms of schizophrenia, has a rapid onset of action, a low incidence of extrapyramidal symptoms, and, in general, mild adverse events. This is an open-label trial of 2 mg dose of an oral formulation of risperidone in combination with 2 to 2.5 mg of oral lorazepam compared with standard care, which consists of a conventional neuroleptic drug administered via an intramuscular injection, with or without lorazepam. Patients requiring emergency care are offered a choice of these two therapies and are monitored for 24 hours after initial treatment. Optional follow up may be performed after 2, 3, and 7 days. The primary measure of effectiveness is the success of the treatment 2 hours after the drug is administered, as indicated by the patient being asleep or by showing improvement on the Clinical Global Impression (CGI) Improvement subscale. Additional effectiveness assessments include an evaluation of hostility and agitation, as assessed by Brief Psychiatric Rating Scale (BPRS), the degree of sedation, and the ability of the patient to interact with the physician at 1, 2, and 24 hours after the start of treatment. Safety assessments include the incidence of adverse events throughout the treatment and follow up periods. The study hypothesis is that oral risperidone combined with lorazepam is more effective than therapy with conventional neuroleptic intramuscular agents, with or without lorazepam, for emergency treatment of patients with schizophrenia. Single, oral 2 mg dose of risperidone and a single, oral 2 to 2.5 mg dose of lorazepam; further dosing during the 24 hour period at investigator's discretion. Comparator drug of choice (with or without lorazepam) administered intramuscularly according to product labeling.

Inclusion Criteria:

• Psychotic patients with schizophrenia who require rapid intervention
• experiencing symptoms of a psychotic disorder
• capable of choosing to be treated

Exclusion Criteria:

• Patients with a known hypersensitivity to the study drugs
• have participated in an investigational drug trial within 30 days of study initiation
• known to be unresponsive to treatment with risperidone or the comparator drug
• known to have benzodiazepine dependence (addiction to this class of anti-anxiety drugs)