| Eligibility |
Inclusion Criteria:
Subjects will be considered eligible to participate in this study if each one of the
following inclusion criteria is satisfied at screening (or at baseline when specified):
1. Male or female aged =18 and <65 years with a body mass index (BMI) of =17 kg/m2 but
=35 kg/m2
2. Current diagnosis of schizophrenia, according to the Diagnostic and Statistical Manual
of Mental Disorders, Fifth Edition (DSM-5) criteria
3. Outpatient; not hospitalized for worsening of schizophrenia within the last 3 months
(hospitalization for social management within this time period is acceptable)
4. Medically stable over the last month and psychiatrically stable without significant
symptom exacerbation over the last 3 months based on the investigator's judgement
5. On oral risperidone 4 mg daily as maintenance therapy for at least the last 4 weeks
prior to screening and on 4 mg oral risperidone once daily QD for at least one week
prior baseline (Day1, Visit 2)
6. Agrees to taper off all prohibited medications prior to baseline
7. On a stable dosage of all permitted medications (with the exception of medication to
be used on an as-needed basis) for at least 2 weeks prior to the baseline visit and
for the duration of the study
8. Clinical Global Impression - Severity (CGI-S) score of =4 (moderately ill)
9. A female subject of childbearing potential who is sexually active and using a
medically accepted contraceptive method. Acceptable methods include condoms (male or
female) with or without spermicidal agent, diaphragm or cervical cap with spermicide,
medically prescribed intrauterine device, and hormonal contraceptives. A female
subject of childbearing potential who is not currently sexually active must agree that
should she be so while participating in the trial, she will use a medically accepted
method of contraception for the remainder of the study and for 1 month afterward.
Female patients who have had a hysterectomy, bilateral tubal ligation, or bilateral
salpingooophorectomy are considered surgically sterile and are thus are exempt from
the requirement to use contraception. Female patients who are postmenopausal are
considered not of childbearing potential and thus exempt from the contraception
requirement; for the purpose of this study, postmenopausal is defined as the permanent
cessation of menstruation for at least 12 months prior to screening in women = 45
years of age.
10. Female subjects must have a negative pregnancy test at screening (serum test) and
baseline (urine test)
11. Psychotherapy should not be started or changed during a patient's participation in the
study. It is acceptable for a patient already receiving psychotherapy to participate
in the study
12. Able to speak, read, and understand sufficiently to allow completion of all study
assessments
13. Must provide written informed consent prior to the initiation of any protocol-specific
procedures
Exclusion Criteria:
Subjects will not be considered eligible to participate in this study if any one of the
following exclusion criteria is satisfied at screening (or at baseline when specified):
1. Presence of an uncontrolled, unstable, clinically significant medical condition (eg,
renal, endocrine, hepatic, respiratory, cardiovascular, hematologic, immunologic or
cerebrovascular disease, or malignancy) that in the opinion of the investigator could
have interfered with the interpretation of safety and PK evaluations
2. Presence of a clinically significant vital sign or physical examination finding that
in the opinion of the investigator could potentially interfere with the ability to
evaluate safety and tolerability of the trial medication or could impair the subject's
ability to complete the trial
3. Presence of a clinically significant abnormality on blood or urine safety tests, which
do not improve on retesting. In particular, laboratory and/or clinical evidence of
clinically significant hepatic conditions, such as:
- alanine aminotransferase (ALT) or aspartate aminotransferase (AST) > 3 × upper
limit of normal (ULN) and total bilirubin > 2 × ULN; or
- ALT or AST > 3 × ULN with the appearance of jaundice, worsening of fatigue,
nausea, vomiting, right upper quadrant pain or tenderness, fever, rash, or
eosinophilia
4. Corrected QT interval, Fridericia's correction (QTcF) interval greater than 450 msec
for males and 470 msec for females, or other clinically significant ECG abnormality on
screening or baseline
5. If female, a positive serum pregnancy test, or planning to become pregnant between
signing informed consent and 1 month after the last dose of trial medication, or is
breastfeeding a child
6. Uncontrolled or unstable diabetes, or a clinically significant abnormal Hba1c blood
level
7. Known or suspected (non-febrile) seizure disorder
8. Known serological evidence of human immunodeficiency (HIV) antibody
9. History of hepatitis B infection within the past year, or history of hepatitis C
infection that has not been adequately treated and abnormal LFT values.
10. History of neuroleptic malignant syndrome
11. Current or past history of clinically significant tardive dyskinesia
12. Primary diagnosis other than schizophrenia diagnosis that is primarily responsible for
current symptoms and functional impairment
13. Known or suspected diagnosis of mental retardation or organic brain disorder
14. Positive urine drug/alcohol (ethanol breathalyzer is also acceptable) screen finding,
unless the positive finding can be accounted for by documented prescription use.
Individuals who have positive results for alcohol, cannabis, or other psychotropic
substances but are not dependent on or abusing these substances may be included at the
investigator's discretion, following a discussion between the investigator and the
medical monitor
15. Heavy smoker (consumption of >40 cigarettes daily)
16. Fulfillment of the DSM-5 criteria for moderate or severe substance use disorder
(excluding nicotine) within the past 6 months
17. Diagnosis of a psychotic disorder or a behavioral disturbance that is thought to be
substance-induced or due to substance abuse
18. In the investigator's opinion, at imminent risk of committing self-harm or harm to
others, based on clinical interview and responses provided on the C-SSRS. Individuals
will be excluded if they report having suicidal ideation of Type 4 or 5 in the past 2
months, or suicidal behavior in the past 6 months, as measured by the C-SSRS at
screening or baseline
19. On more than 1 antidepressant; or if on just one, a change in dose within the last 4
weeks prior to screen
20. Use of depot antipsychotics within the last 6 to 9 months
21. Use of electroconvulsive therapy (ECT) within the last 3 months
22. Use of moderate or strong cytochrome P450 (CYP) 3A4 enzyme inducers and inhibitors
(carbamazepine, phenytoin, rifampicin, phenobarbital) or moderate or strong CYP2D6
inhibitors (fluoxetine, paroxetine) (see Appendix 11.2) within 3 days or a time period
of 5 half lives of the concerning drug, whichever is longer, prior to baseline
23. Unwilling to discontinue any of prohibited medications prior to the baseline visit;
or, in the opinion of the investigator, is unable to safely taper off such medication
without significant destabilization or increased risk of self-harm (suicide).
Prohibited medications may include antipsychotics, phenobarbital, fluoxetine,
fluoxetine combinations, paroxetine, benzodiazepines except lorazepam, diazepam,
oxazepam, psychotropics, herbal drugs/dietary supplements for depression, anxiety,
insomnia, rifampicin, and quinidine
24. Receipt of any investigational drugs within the last 3 months
25. Current participation in any other clinical trial
26. In the investigator's opinion, medically non-compliant in the management of his or her
disease
27. Known or suspected allergy or hypersensitivity to risperidone or any of the ISM
excipients
28. Previous non-responder to risperidone treatment
29. Currently under involuntary in-patient commitment
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