Reducing the Burden of Chronic Psychotic Disorders in Tanzania (CAPACITY)

Inclusion Criteria: * Age 18 and older * Diagnosis of schizophrenia or schizoaffective disorder * Known to have medication treatment adherence problems as identified by the TRQ (20% or more missed medications in past week or past month) * Ability to be rated on psychiatric rating scales * Willingness to take long-acting injectable medication * Able to provide written, informed consent to study participation Exclusion Criteria: * History of allergy or intolerance to haloperidol or haloperidol decanoate * Individuals on long-acting injectable antipsychotic medication immediately prior to study enrollment * Medical condition or illness, which in the opinion of the research psychiatrist, would interfere with the patient's ability to participate in the trial * Physical dependence on substances (alcohol or illicit drugs) likely to lead to withdrawal reaction during the course of the study in the clinical opinion of the treated research psychiatrist * Immediate risk of harm to self or others * Female who is currently pregnant or breastfeeding