Risperidone Maintenance Treatment in Schizophrenia

Capital Medical University

Status and phase: Completed; Phase 4

Conditions: Schizophrenia

Treatments: Drug: risperidone

Study type: Interventional

Funder types: Other

Identifiers

NCT00848432

2004BA720A22

Details and patient eligibility

About

This study set out to determine the duration of maintenance treatment with therapeutic risperidone dose in schizophrenia. In a multi-center, open label, randomized, controlled study design, patients with schizophrenia who were clinically stabilized following an acute episode were randomly assigned to a 'maintenance group' (optimal therapeutic doses continued for at least 1 year), a 4-week group (optimal therapeutic doses continued for 4 weeks followed by a 50% dose reduction that was maintained for at least 11 months) or a 26-week group (optimal therapeutic doses continued for 26 weeks followed by a 50% dose reduction for at least another 6 months).

Full description

Prevention of relapse is the crucial task in the maintenance treatment of schizophrenia. This study set out to determine the duration of maintenance treatment with therapeutic risperidone dose in schizophrenia. In a multi-center, open label, randomized, controlled study design, patients with schizophrenia who were clinically stabilized following an acute episode were randomly assigned to a 'maintenance group' (optimal therapeutic doses continued for at least 1 year), a 4-week group (optimal therapeutic doses continued for 4 weeks followed by a 50% dose reduction that was maintained for at least 11 months) or a 26-week group (optimal therapeutic doses continued for 26 weeks followed by a 50% dose reduction for at least another 6 months).

Enrollment: 404 patients

Sex: All

Ages: 18 to 65 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. in- or outpatient of either sex diagnosed with DSM-IV schizophrenia
2. having been clinically stable following an acute episode for at least 4 but less than 8 weeks, with 'clinical stability' defined as a sum score of the Brief Psychiatric Rating Scale (BPRS) of less than 36 points
3. aged between 18 and 65 years
4. receiving risperidone monotherapy titrated to optimal level in the acute phase of treatment for the psychotic episode
5. local resident, living with at least one family member after discharge
6. having satisfactory treatment adherence defined by a pill count that yielded more than 80% adherence to risperidone prescription over the past 4 weeks
7. understanding the aims of the study and having signed the consent form

Exclusion criteria

1. taking antidepressants, mood stabilizers, and Chinese herbal remedies concomitantly with risperidone, or having received electroconvulsive therapy (ECT), or participating in any other drug trials or interventional studies over the 4 weeks before study entry
2. having a history or ongoing experience of major chronic medical or neurological condition(s) requiring treatment that would be likely to affect psychic functions
3. past or current drug/alcohol abuse other than nicotine
4. being pregnant or having plans to become pregnant, lactating, or not practicing an effective method of birth control

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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404 participants in 3 patient groups

1

Experimental group

Description:

Optimal therapeutic doses of risperidone continued for 4 weeks followed by a 50% dose reduction that was maintained for at least 11 months in clinically stable schizophrenia patients

Treatment:

Drug: risperidone

2

Experimental group

Description:

Optimal therapeutic doses of risperidone continued for 26 weeks followed by a 50% dose reduction for at least another 6 months in clinically stable schizophrenia patients

Treatment:

Drug: risperidone

3

Experimental group

Description:

Optimal therapeutic doses of risperidone continued for at least 1 year in clinically stable schizophrenia patients

Treatment:

Drug: risperidone