Inclusion Criteria:  Men and women 18-35 years old Current collegiate or professional swimmer Currently training at least 300 minutes per week Self-reported to be healthy  Exclusion Criteria:  Not within defined age range  Current diagnosis of or using medication for:  Severe allergies Asthma Exercise-induced asthma Exercise-induced bronchoconstriction Pulmonary function test considered to be abnormal (defined as forced vital capacity (FVC) <80% of predicted, forced expiratory volume in one second (FEV1) <80% predicted, and/or FEV1/FVC ratio >5% of the predicted ratio) Hypertension during screening (systolic blood pressure >139 or diastolic blood pressure >89) Current tobacco or electronic cigarette use or consistent use within the last 2 years  A contraindication for use of nedocromil sodium:  Previous adverse reaction to nedocromil sodium or a similar medication Use of fast-acting, inhaled insulin  A contraindication for use of cetirizine HCl:  Previous adverse reaction to cetirizine HCl or a similar medication Allergy to the food additives E218 or E216 An intolerance to or inability to absorb some sugars, such as lactose or sorbitol Liver or kidney failure Epilepsy or similar condition A condition that makes urinating difficult Use of midodrine or ritonavir Are pregnant or could possibly be pregnant by self-report Subjects with current, irregular menstrual cycles (amenorrhea) or who had irregular menstruation patterns for greater than one year People who answer 'yes' to any of the pre-participation screening questions on page one of the PAR-Q+ questionnaire.