Please assess the completion status of the following clinical trial:

Trial Title: Memantine as Adjunctive Therapy for Schizophrenia Negative Symptoms

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:~* Under clozapine with negative symptoms~Exclusion Criteria:~* Pregnancy~* Lactation

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 60 Years
- Healthy Volunteers: f

Study Arms:
- 1 (Type: PLACEBO_COMPARATOR): Clozapine plus placebo
- 2 (Type: ACTIVE_COMPARATOR): Clozapine plus memantine

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