Please assess the completion status of the following clinical trial:

Trial Title: Efficacy of Metronidazole Prophylaxis Against Clostridium Difficile-Associated Diarrhea in High Risk Adult Patients

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

Eligibility Criteria:
Inclusion Criteria:~* Inpatients \>55~* Proton Pump inhibitor / Histamine-2 Blocker~* On broad spectrum antibiotics (Zosyn and/or Ciprofloxacin). These two antibiotics are selected based on current hospital formulary/use~* Anticipated hospital stay \>48 hours~* Mental capacity (able to give informed written consent).~Exclusion Criteria:~* Admission for CDI~* Existing diarrhea at admission~* Passed prophylactic window (\>48 hours on broad spectrum antibiotics)~* Unable to take PO at the time of evaluation for study entry~* No more than 14 days of broad spectrum antibiotics anticipated~* Medications with serious interactions/contraindications to that would be taken together with metronidazole (ex. Warfarin, disulfiram, phenytoin, calcineurin inhibitors)~* Inflammatory Bowel Disease~* Admission for colonic bowel surgery or h/o total/Subtotal colectomy)~* Hospice~* Mortality expected \<7days~* Previous CDI in the past 6 months~* Intensive care admission due to the difficulty of monitoring them~* Allergy to Metronidazole or other Antibiotics in protocol~* Patients with neuropathy~* History of heavy ethyl alcohol intake(greater than 3 drinks daily) or intake in past 24 hours,Solid organ transplant.

- Gender: ALL
- Minimum Age: 55 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Metronidazole (Type: EXPERIMENTAL): Metronidazole tablets 500mg orally or IV , 3 times a day for a maximum of 14 days
- Placebo (Type: PLACEBO_COMPARATOR): Placebo(Corn starch pill) orally 3 times a day for a maximum of 14 days

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