Inclusion Criteria:  Participant has provided informed consent History of physician-diagnosed asthma Age ≥18 to <50 at time of consent  Past evidence of airway reactivity (within 12 months of consent), defined as:  Documentation of ≥12% FEV1 improvement following bronchodilator OR Positive methacholine challenge (20% or more FEV1 decrease at ≤ 16 mg/mL)  Evidence of recent asthma symptoms measured at Screening, defined as either:  Self-reported use of short-acting beta-agonist (SABA) for asthma symptoms at least twice/week on average over the past month OR Asthma Control Questionnaire, 5-item version (ACQ - 5) ≥ 1.25 Willing and able to undergo study procedures and attend required study visits Adequate venous access for blood draws and drug administration, as determined by study investigator, or designee Weight ≥ 40kg FEV1 ≥ 60% predicted on day of terbutaline sulfate dosing Systolic blood pressure (BP) ≤ 150 millimeters of Mercury (mmHg) and diastolic BP ≤ 90 mmHg measured after 10 to 15 minutes of rest Heart rate > 45 and < 110 beats per minute (bpm) measured after 10 to 15 minutes of rest Female participants of child-bearing potential: negative pregnancy test ((uUrine hCG)) at Screening screening and agreement to use effective contraception (complete abstinence from vaginal intercourse, combination barrier and spermicide, partner vasectomy, bilateral tubal ligation, intrauterine device (IUD), progestin implants, or hormonal) during study participation  Exclusion Criteria:  Self-reported pregnancy or lactating or breastfeeding Previous enrollment in the current study (any part) Any chronic respiratory condition besides asthma (including, but not limited to Chronic Obstructive Pulmonary Disease (COPD), emphysema, or interstitial lung disease) that in the opinion of the Principal Investigator (PI) or clinical site investigator, would make the participant unsuitable for the study Body Mass Index (BMI) > 35 kg/m2 (class II or III obesity) Moderate to severe renal impairment, defined as estimated glomerular filtration rate (eGFR) < 60 mL/min/1.73m2 Self-reported smoking (including any vaping/e-cigarettes/marijuana) in past 6 months Greater than 10 pack-year smoking history Any history of cardiac disease (e.g. coronary insufficiency, cardiac arrhythmias), non-skin cancer, clinically diagnosed hypertension, hyperthyroidism, diabetes mellitus or epilepsy History of ocular, brain, abdominal or thoracic surgery in the 12 months prior to screening Known hypersensitivity to terbutaline sulfate Use of any medications from the following classes within 30 days prior to Visit 1: monoamine oxidase inhibitors, tricyclic antidepressants, betablockers, antihypertensive diuretics Self-reported respiratory tract infection in the 14 days prior to Visit 1 Any current chronic condition or past history of disease that, in the opinion of the PI would make the participant unsuitable for the study Baseline prolongation of QTc (QTc ≥ 460 ms by Fridericia's formula) Participation in another research study that includes use of any investigational drug treatment within the 30 days prior to Visit 1, or planned participation during the study period.