Please assess the completion status of the following clinical trial:

Trial Title: Memantine-enhanced Buprenorphine Treatment for Opioid-dependent Young Adults

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE2/PHASE3
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* Men and women between 18-25 years old~* Opioid dependence as evidenced by signs of opiate withdrawal, self-reported history of opioid dependence for a consecutive 12 month period and positive urine for opioids~Exclusion Criteria:~* Current diagnosis of other drug or alcohol dependence (other than opiates, cannabis or tobacco)~* Serious medical illness (e.g. major cardiovascular, renal, endocrine, hepatic disorder)~* Current serious psychiatric illness or history of psychosis, schizophrenia, bipolar type I disorder and participants with suicidal or homicidal thoughts~* Women who are pregnant, nursing or refuse to use a reliable form of birth control or refuse monthly pregnancy testing~* Screening liver function tests (SGOT or SGPT) greater than 3 times normal

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 25 Years
- Healthy Volunteers: f

Study Arms:
- Memantine 30mg/day + Buprenorphine (Type: EXPERIMENTAL): Participants were inducted onto buprenorphine/naloxone sublingual tablets during the first week of study participation. The dose was titrated from bup/nal 8mg to bup/nal 16mg in three days where it will remain until the last day of week 8. The 7-day discontinuation of buprenorphine-naloxone on week 9 was 12mg, 10mg, 8mg, 6mg, 4mg, 2mg, 2mg and stopped.~Memantine 5mg in the morning was started on week 2. The dose was titrated on a twice a day schedule until the target dose of 30 mg/day was achieved by week 4. The medication was discontinued over a one-week period on week 13. Patients received a 7-day supply of their medication each week.
- Memantine 15mg/day + Buprenorphine (Type: EXPERIMENTAL): Participants were inducted onto buprenorphine/naloxone sublingual tablets during the first week of study participation. The dose was titrated from bup/nal 8mg to bup/nal 16mg in three days where it will remain until the last day of week 8. The 7-day discontinuation of buprenorphine-naloxone on week 9 was 12mg, 10mg, 8mg, 6mg, 4mg, 2mg, 2mg and stopped.~Memantine 5mg in the morning was started on week 2. The dose was titrated on a twice a day schedule until the target dose of 15 mg/day was achieved by week 4. The medication was discontinued over a one-week period on week 13. Patients received a 7-day supply of their medication each week.
- Memantine 0mg/day + Buprenorphine (Type: PLACEBO_COMPARATOR): Participants were inducted onto buprenorphine/naloxone sublingual tablets during the first week of study participation. The dose was titrated from bup/nal 8mg to bup/nal 16mg in three days where it will remain until the last day of week 8. The 7-day discontinuation of buprenorphine-naloxone on week 9 was 12mg, 10mg, 8mg, 6mg, 4mg, 2mg, 2mg and stopped.~Matching placebo capsule was started on week 2. The placebo capsules were given on a twice a day schedule until week 12 and then discontinued over a one-week period on week 13. Patients received a 7-day supply of their medication each week.

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

Answer: outcome: complete