Please assess the completion status of the following clinical trial:

Trial Title: Study of Promethazine for Treatment of Diabetic Gastroparesis

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE2
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* adult patients 18-65 years of age~* clinical diagnosis of diabetic gastroparesis.~* EGD without evidence of gastric outlet obstruction within the past five years~* gastric emptying scintigraphy test demonstrating \>10% solid food retention at 4 hours within the past three years.~Exclusion Criteria:~* the inability or unwillingness to provide informed consent~* currently pregnant or breast feeding~* prior placement of a gastric stimulator~* pyloric botulinum toxin injection within the past 12 months~* prior gastric surgery~* history of a connective tissue disorder~* use of narcotic medication within the past four weeks~* hemoglobin A1C \>12 mg/dL within the past 3 months~* current or recent (within past 4 weeks) use of promethazine, metoclopramide or domperidone~* hypersensitivity or prior adverse reaction to promethazine~* concomitant use of phenothiazines (i.e. prochlorperazine, chlorpromazine) or other agents likely to increase extrapyramidal reactions~* concomitant use of tiotropium or ipratropium~* narrow angle glaucoma~* urinary retention~* Parkinson's disease~* significant psychiatric disease~* history of seizure.

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

Study Arms:
- Promethazine (Type: EXPERIMENTAL): Promethazine 12.5 mg P.O. t.i.d. for 4 weeks
- Sugar Pill (Type: PLACEBO_COMPARATOR): Placebo P.O. t.i.d. for 4 weeks

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