Please assess the completion status of the following clinical trial:

Trial Title: The Effect of Metformin on Obesity and Metabolic Disturbance in Patients Taking Clozapine

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Age: 18 \~ 65~* Patient with schizophrenia according to DSM-IV criteria~* Patient have signed on the informed consent, and well understood the objective and procedure of this study.~* Patient taking clozapine 3months or more~* Patient increased in weight more than 10 % of that of before antipsychotics use~Exclusion Criteria:~* Patient taking other antipsychotics with clozapine~* Patient in treatment of diabetes~* Patient in treatment of dyslipidemia~* Allergy or hypersensitivity to metformin~* Pregnant or breast-feeding female patient.~* Patient with severe medical condition

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- Metformin group (Type: EXPERIMENTAL): Metformin 500mg 1 tablet p.o. bid
- Placebo group (Type: PLACEBO_COMPARATOR): 1 tablet p.o. bid

Based on this trial design, predict the completion outcome and termination type (if applicable).