An Efficacy and Safety Study of 3 Fixed Doses of JNJ-37822681 in Participants With Schizophrenia

The purpose of this study is to evaluate the efficacy and safety of 3 fixed doses of JNJ-37822681 compared with placebo (an inactive substance that is compared with a drug to test if the drug has a real effect in a clinical trial) after 6 weeks treatment and olanzapine after 12 weeks treatment in participants with schizophrenia (psychiatric disorder with symptoms of emotional instability, detachment from reality, often with delusions and hallucinations, and withdrawal into the self).

This is a multicenter (when more than one hospital or medical school team work on a medical research study), double-blind (neither the participant nor the physician know the study medication drug name), randomized (study drug assigned by chance), placebo- and active-controlled, parallel-group (a clinical trial comparing the response in two or more groups of participants receiving different treatments), dose-response study in participants with schizophrenia. The total study duration will not exceed 16 weeks for each participant and will include following visits: screening, baseline, Week 1, 2, 3, 4, 5, 6, 7, 8, 9, 11 and 13 (end of treatment or early withdrawal), and a post-study safety visit (1 week after final dose of study drug). All participants will be hospitalized during the first 2 weeks of treatment for detailed follow-up of safety and disease status. Following a screening period, participants will be randomly assigned to one of 5 treatment groups to receive oral doses of JNJ-37822681 (10, 20 or 30 milligram \[mg\] twice a day) for 12 weeks, olanzapine 15 mg daily for 12 weeks, or placebo for 6 weeks followed by olanzapine 15 mg daily for the remaining 6 weeks. Olanzapine will be initiated at 10 mg daily for 1 week and then increased to 15 mg daily for the remainder of the treatment period. Efficacy will primarily be evaluated by Positive And Negative Syndrome Scale (PANSS). Participants' safety will also be monitored at each visit.

Eligibility Criteria:
Inclusion Criteria:

* Participants must have been diagnosed with schizophrenia according to Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV) (295.10, 295.20, 295.30, 295.60, 295.90) at least 1 year prior to screening
* Participants must be experiencing an acute (a quick and severe form of illness in its early stage) exacerbation of less than 6 months duration, with a Positive and Negative Syndrome Scale (PANSS) total score at screening between 70 and 120 inclusive and at baseline of between 60 and 120 inclusive
* Women of child bearing potential must have a negative urine pregnancy test at screening and baseline before receiving the study drug
* Participants must agree to voluntary hospitalization for a minimum of 14 days
* BMI (Body Mass Index) maximum 40 kilogram per meter square (kg/m\^2), inclusive (BMI=weight/height\^2)

Exclusion Criteria:

* A DSM-IV axis I diagnosis other than schizophrenia
* A DSM-IV diagnosis of substance dependence within 6 months prior to screening evaluation
* Any clinically relevant medical condition that could potentially alter the absorption (the way a drug or other substance enters the body), metabolism, or excretion (the way that substances leave the body) of the study medication, such as Crohn's disease (serious inflammation of any part of the gastrointestinal tract), liver disease, or renal (pertaining to the kidneys) disease
* Relevant history of any significant and/or unstable cardiovascular (pertaining to the heart and blood vessels), respiratory, neurological (including seizures) or significant cerebrovascular (pertaining to brain and blood vessels), renal, hepatic, endocrine (pertaining to the glands that make hormones), or immunologic diseases
* History of neuroleptic malignant syndrome (high fever, rigid muscles, shaking, confusion, sweating more than usual, increased heart rate or blood pressure, or muscle pain or weakness)