Aroxybutynin and Atomoxetine

An AE is any untoward medical occurrence in a participant or clinical study participant, temporally associated with the use of a study treatment, whether or not considered related to the medicinal product. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study treatment. An SAE was an AE during any study phase that fulfills one or more of the following criteria: results in death, life threatening (The term 'life-threatening' in the definition of 'serious' refers to an event in which the participant was at risk of death at the time of the event. It does not refer to an event, which hypothetically might have caused death, if it were more severe), requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent disability/incapacity.

Vital signs that are planned to be assessed include parameters such as weight,heart rate and systolic and diastolic blood pressure.

Concomitant therapy with devices (i.e., CPAP) and concomitant medications are other prescription medications, over-the-counter (OTC) drugs or dietary supplements that a study participant takes in addition to the drug under investigation.

AHI, Apnea-Hypopnea Index, is the number of apneas or hypopneas recorded via polysomnography during the study per hour of sleep. Apnea is defined as a cessation of airflow lasting at least 10 seconds, hypopnea as a decrease in airflow by at least 30% from baseline for at least 10 seconds occurring with a drop in oxygen saturation (SpO2) by at least 4%.

General safety and tolerability will be assessed between treatment cohorts using the occurrence of spontaneously reported adverse events (AEs) at 6 weeks

Change in AHI4 (apnea-hypopnea index, 4% oxygen desaturation criterion; average respiratory events per hour of sleep) measured by in-lab polysomnography. Baseline was the mean of two pre-treatment PSG nights (Visits 2 and 3). Change from baseline was assessed at treatment PSG nights at approximately Day 21 (Visit 5) and Day 28 (Visit 6), modeled as repeated measures, with the reported value representing the model-based LS mean using equal (0.5/0.5) weighting between the Day 21 and Day 28 visits.

Change in Hypoxic Burden (HB) is calculated as the oxygen desaturation 'area under the curve' in association with individual apneas and hypopneas. Due to the known logarithmic distribution of HB, data are primarily expressed and analyzed as Log10HB 4%\[% min/hour\]. Events with 4% or greater desaturations were included in the calculation of HB.