Please assess the completion status of the following clinical trial:

Trial Title: Analgesic Potentials of Preoperative Pregabalin,Magnesium Sulphate and Their Combination in Acute Post-thoracotomy Pain

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE3
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~1. ASA status of1 or 2~2. Patients undergoing thoracotomy~3. Body mass index (BMI): Less than forty and more than twenty.~Exclusion Criteria:~- 1. Known sensitivity or contraindication to drugs used in the study. 2. History of psychological disorders and/or chronic pain. 3. Patients receiving medical therapies that are considered to result in tolerance to opioids.~4. Significant liver or kidney diseases that will affects the pharmacokinetics of study drugs.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- Pregabalin & placebo (Type: ACTIVE_COMPARATOR): : will receive single dose oral Pregabalin 300 mg one hour preoperative and 200 ml of normal saline over 20 min.
- Magnesium sulphate & Placebo (Type: ACTIVE_COMPARATOR): will receive preoperative single dose IV Magnesium Sulphate 50mg /kg infused over 20 minutes diluted in 200 ml normal saline and a placebo capsule similar to pregabalin 300 mg.
- Pregabalin & Magnesium sulphate (Type: ACTIVE_COMPARATOR): : will receive single dose oral pregabalin 300mg one hour preoperative and single dose IV Magnesium Sulphate 50mg /kg infused over 20 minutes diluted in 200 ml normal saline.
- Placebo (Type: PLACEBO_COMPARATOR): will receive placebo medications at the same time and route of administration of other groups.

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