Please assess the completion status of the following clinical trial:

Trial Title: A Study of the Pharmacokinetics and Pharmacodynamics of Vibegron (MK-4618) in Women With Overactive Bladder (MK-4618-004)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE1
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* Non-child bearing potential (status post menopausal or post hysterectomy,oophorectomy or tubal ligation). If of reproductive potential, must be non-pregnant (confirmed via blood test) and agree to use (and/or have their partner use) two acceptable methods of birth control beginning at least 2 weeks prior to administration of the first dose of study drug,throughout the study (including washout intervals between treatment periods/panels) and until at least 2 weeks after administration of the last dose of study drug in the last treatment period.~* Body mass index (BMI) of ≤40 kg/m\^2 (ie, not morbidly obese)~* Clinical history of overactive bladder symptoms (OAB) for at least 3 months~* Capable of completing an accurate daily diary for reporting purposes~Exclusion Criteria:~* Mentally or legally incapacitated, such as significant emotional problems (other than situational depression) or diagnosed with a significant psychiatric disorder during the past 5-10 years~* Other types of urinary incontinence (ie,stress or mixed)~* History (current or past)of interstitial cystitis, painful bladder syndrome, or chronic pelvic pain or Stage III or greater pelvic organ prolapse~* Other types of kidney/urinary bladder disease/obstruction or infection. Participants with with a history of uncomplicated kidney stones may be enrolled in the study at the discretion of the investigator~* Inability to control bowel movements~* History of narrow angle glaucoma, immunocompromise, stroke, chronic seizures, major neurological disorders and/or other serious and chronic organ-system health conditions (ie, heart disease)~* Urinary catheter, either permanent or intermittent placement~* Failure to meet medication profile requirements or directives required for study eligibility~* Condition for which there is a warning, contraindication, or precaution against the use of tolterodine ER or anticipates the use of prescription medications contraindicated with the use of tolterodine ER~* Daily alcohol or caffeine intake exceeds study requirements (for alcohol: defined as greater than 2 glasses of alcoholic beverages (1 glass is approximately equivalent to: beer \[284 mL/10 ounces\], wine \[125 mL/4 ounces\], or distilled spirits \[25 mL/1 ounce\]) per day; and for caffeine: defined as greater than 3 servings (1 serving is approximately equivalent to 120 mg of caffeine) of coffee,tea, cola, or other caffeinated beverages (ie, Red Bull) per day~* Inability to refrain from smoking throughout the study's duration~* Illicit drug use~* Recent surgery or recent participation in another clinical trial~* Severe, frequent allergies or history of life-threatening reactions or intolerability to prescription or non prescription medications or food~* Intended or unintended extended absence or exposure to significant change in time zone or sleep schedule (ie, transmeridian travel or shift work) that will interfere with accurate completion of scheduled daily diary entries

- Gender: FEMALE
- Minimum Age: 40 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- Vibegron 100 mg + tolterodine ER 4 mg → placebo (Type: EXPERIMENTAL): During Treatment Period 1, participants will receive 7 days of once-daily vibegron 100 mg and tolterodine extended-release (ER) 4 mg. Participants will then complete a 2-week single-blind double-dummy placebo washout period prior to Treatment Period 2. During Treatment Period 2, participants will receive 7 days of once-daily placebo to match vibegron and placebo to match tolterodine ER.
- Placebo → vibegron 100 mg (Type: EXPERIMENTAL): During Treatment Period 1, participants will receive 7 days of once-daily placebo to match vibegron and placebo to match tolterodine ER. Participants will then complete a 2-week single-blind double-dummy placebo washout period prior to Treatment Period 2. During Treatment Period 2, participants will receive 7 days of once-daily vibegron 100 mg and placebo to match tolterodine ER.
- Placebo → tolterodine ER 4 mg (Type: ACTIVE_COMPARATOR): During Treatment Period 1, participants will receive 7 days of once-daily placebo to match vibegron and placebo to match tolterodine ER. Participants will then complete a 2-week single-blind double-dummy placebo washout period prior to Treatment Period 2. During Treatment Period 2, participants will receive 7 days of once-daily tolterodine 4 mg and placebo to match vibegron.
- Placebo → vibegron 50 mg (Type: EXPERIMENTAL): During Treatment Period 1, participants will receive 7 days of once-daily placebo to match vibegron and placebo to match tolterodine ER. Participants will then complete a 2-week single-blind double-dummy placebo washout period prior to Treatment Period 2. During Treatment Period 2, participants will receive 7 days of once-daily vibegron 50 mg and placebo to match tolterodine ER.

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