Please assess the completion status of the following clinical trial:

Trial Title: A Randomized Controlled Trial Evaluating Sildenafil Citrate in Relieving Ureteral Stent Related Symptoms

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

Eligibility Criteria:
Inclusion Criteria:~1. Patient aged \>18 years~Exclusion Criteria:~1. Patients who had LUTS before DJ stent fixation~2. DJ stent fixation after open surgery~3. Contraindication to Sildenafil citrate

- Gender: MALE
- Minimum Age: 18 Years
- Maximum Age: 70 Years
- Healthy Volunteers: f

Study Arms:
- Sildenafil (Type: ACTIVE_COMPARATOR): Patient in this arm will receive sildenafil citrate 50 mg tablet once daily after ureteral stent fixation.
- Placebo (Type: PLACEBO_COMPARATOR): Patient in this arm will receive placebo daily after ureteral stent fixation.

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