Oxcarbazepine as an Adjunct of Antipsychotic Therapy in Acute Schizophrenia (OXC-SCZ)

Study Description

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Brief Summary:

Over recent years an approach with the adjunctive administration of various anticonvulsant drugs has been discussed and a limited number of open and controlled studies were performed for carbamazepine, valproic acid, and lamotrigine. While the latter shows promising effects in the long run it has some handling difficulties in the acute treatment of acute psychotic exacerbations. Valproic acid has shown inconsistent effects in schizophrenia with no significant effects in a recent controlled study. Although still controversially discussed, carbamazepine was found to offer beneficial effects in the treatment of schizophrenia. Nonetheless, data on these effects are limited by small sample sizes or poor design of most of the respective studies. Furthermore, the complex pharmacological interactions of new atypical neuroleptics with carbamazepine underline the necessity of alternative strategies in adjuvant treatment of schizophrenia as well as in combined treatment of bipolar disorders with mood stabilizers and neuroleptics.

Oxcarbazepine (OXC) is a new anticonvulsant drug that acts as a pro-drug for the 10-monohydroxy metabolite (MHD), an active metabolite also of carbamazepine that is suggested to be responsible for most of its therapeutic actions. Therefore, the pharmacological action of OXC is very well comparable to carbamazepine whilst there are fewer unwanted side effects of OXC regarding eg. skin rush, and effects on blood compounds or cardiotropic effects.

The effects of OXC on cytochrome CYP3A4 and CYP3A5 are moderate and UDPGT is only slightly affected by OXC, which leads to less interaction with other compounds on a pharmacokinetical level.

In psychiatry, the few studies published until now report positive effects of OXC in bipolar disorders. With regards to our own clinical observations, OXC has shown potential beneficial effects as an adjunct in the treatment of schizophrenia as well that require further evaluation in a controlled study design.

Condition or disease	Intervention/treatment	Phase
Schizophrenia	Drug: Oxcarbazepine; Drug: Placebo	Phase 2; Phase 3

Detailed Description:

This is an explorative controlled study with Oxcarbazepine (OXC) as an adjunct in the acute treatment of schizophrenia. The study will be performed in subjects between 18 and 50 years of age with an acute schizophrenic or schizophreniform disorder according to DSM-IV. The study will be performed according to Guidelines for Good Clinical Practice (GCP).

The primary hypothesis of this study is that adjunctive treatment with OXC yields at least comparable efficacy regarding antipsychotic actions with lower doses of neuroleptics and consequently substantially fewer adverse events.

A randomised controlled, double blind study is intended. During a 6 weeks treatment trial two groups of patients will be basically treated with olanzapine (starting with 5 mg after one week with an optional, BPRS-controlled step by step increase of about 2,5 mg each following week). Patients will receive a placebo controlled adjunctive therapy with OXC (1800 mg/day). After the initial lead-in of OXC within 7 days (allowing lorazepam as comedication), treatment with olanzapine will be started. Based on biometric calculations, a drop out adjusted sample size of 222 inpatients will be necessary

Study Design

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Study Type :	Interventional (Clinical Trial)
Actual Enrollment :	54 participants
Allocation:	Randomized
Intervention Model:	Parallel Assignment
Masking:	Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose:	Treatment
Official Title:	Oxcarbazepine as an Adjunct of Antipsychotic Therapy in Acute Schizophrenia
Study Start Date :	July 2004
Actual Primary Completion Date :	April 2008
Actual Study Completion Date :	July 2008

Arms and Interventions

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Arm	Intervention/treatment
Experimental: 1	Drug: Oxcarbazepine; Oxcarbazepine (OXC), 300 mg tablets, up to 600 mg three times daily; Other Names: Trileptal FCT 300MG.002; Film-coated tablet; Batch No.: X208 0802; Code: 3750031.002; Date of manufacture: September 2002; Date of evaluation: May 2004
Placebo Comparator: 2	Drug: Placebo; Placebo, 300 mg tablets, up to 600 mg three times daily; Other Names: TRL PLA FCT.005; Film-coated tablet; Batch No.: X207 0802; Code: 3750411.005; Date of manufacture: September 2002; Date of evaluation: May 2004

Outcome Measures

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Primary Outcome Measures :

1. Amount of Olanzapine Co-medication [ Time Frame: 5 weeks ]

Secondary Outcome Measures :

1. BPRS [ Time Frame: 6 weeks ]
2. Extrapyramidal symptoms [ Time Frame: 6 weeks ]
3. Weight gain [ Time Frame: 6 weeks ]
4. Prolactin levels in plasma [ Time Frame: 6 weeks ]
5. ECG QT-C time elongation [ Time Frame: 6 weeks ]
6. Neurocognitive performance [ Time Frame: 6 week ]

Eligibility Criteria

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Ages Eligible for Study:	18 Years to 65 Years (Adult)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	No

Criteria

Inclusion Criteria:

• Clinical diagnosis of schizophrenia or schizophreniform psychosis according to DSM-IV
• BPRS score > 36 and BPRS psychosis cluster > 12
• Ability to provide written informed consent
• Participants are required an adequate contraception

Exclusion Criteria:

• Any severe neurological or somatic disorder
• Other psychiatric disorders including addictive disorders
• Positive urine drug screening for any compound except benzodiazepines
• No pregnancy or breast feeding

Contacts and Locations

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Locations

Germany
Isar-Amper-Klinikum gemeinnützige GmbH, Klinik Taufkirchen (Vils)
Taufkirchen (Vils), Bayern, Germany, 84416
University of Cologne, Dept. of Psychiatry and Psychotherapy
Cologne, NRW, Germany, 50924

Sponsors and Collaborators

University of Cologne

Investigators

Study Director:	F. Markus Leweke, MD	University of Cologne

More Information

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Additional Information:

Related Info 

Responsible Party:	Dr. F. Markus Leweke, University of Cologne
ClinicalTrials.gov Identifier:	NCT00637234 History of Changes
Other Study ID Numbers:	OXC-SCZ CTRI476BDE06
First Posted:	March 17, 2008
Last Update Posted:	July 24, 2008
Last Verified:	July 2008

Additional relevant MeSH terms:

Schizophrenia; Schizophrenia Spectrum and Other Psychotic Disorders; Mental Disorders; Antipsychotic Agents; Oxcarbazepine; Carbamazepine; Tranquilizing Agents; Central Nervous System Depressants; Physiological Effects of Drugs; Psychotropic Drugs; Anticonvulsants	Voltage-Gated Sodium Channel Blockers; Sodium Channel Blockers; Membrane Transport Modulators; Molecular Mechanisms of Pharmacological Action; Cytochrome P-450 CYP3A Inducers; Cytochrome P-450 Enzyme Inducers; Antimanic Agents; Analgesics, Non-Narcotic; Analgesics; Sensory System Agents; Peripheral Nervous System Agents