Please assess the completion status of the following clinical trial:

Trial Title: Methadone in Post-Herpetic Neuralgia Pain

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Patients with chronic (\>6 months) symptomatic PHN~* with visual analogical scale \>40/100mm~* use of first and second line drugs (tricyclic antidepressants, venlafaxine and gabapentinoids)~Exclusion Criteria:~* Don't full the criteria above

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Methadone (Type: EXPERIMENTAL): in this arm patients will take methadone 5mg.
- Placebo (Type: EXPERIMENTAL): in this arm patients will take placebo pills.

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