ASA inhalation powder is an inhaled nonsteroidal anti-inflammatory drug-device combination that has been developed to reduce the risk of vascular mortality in patients with suspected acute myocardial infarction (MI), an FDA approved indication for oral formulations of aspirin.

The primary goal of study OTP-P0-926 is to collect pharmacokinetic (PK)and pharmacodynamics (PD) pilot data to determine onset and extent of aspirin response after administration of varying doses of inhaled ASA (50-100mg) and 162 mg Non-Enteric-Coated Chewable ASA. PD will be assessed using standard methods to measure platelet inhibition by aspirin including platelet aggregation, serum thromboxane,and urinary thromboxane. Furthermore, the pharmacokinetics (PK) of ASA will be determined and compared to PD measurements. Results of this pilot study will guide dosing in a subsequent larger Phase II study.

Inclusion Criteria:

• Male or female subjects, 18-55 years of age
• Non-smokers
• Body mass index (BMI) within 18.5 kg/m2 to 32.0 kg/m2
• Female subjects of childbearing potential must agree to use acceptable methods of birth control or abstain from sex during study participation and must have a negative serum or urine pregnancy test
• Subjects must be healthy as determined by medical history, physical examination, vital signs, and clinical laboratory evaluation
• Signed informed consent

Exclusion Criteria:

• At screening visit, subjects with a forced expiratory volume in 1 second (FEV1) (i.e., FEV1% predicted < 80%).
• At screening visit, subjects with a forced expiratory flow at 25%-75% (FEF 25%-75%) of pulmonary volume < 70% predicted.
• Patients with a flow rate <70 L/min with a G-16 training device set at medium resistance.
• Hematocrit value ≤32%
• Clinically significant hemoglobin value, at screening, as per investigator.
• Arachidonic acid induced-maximum platelet aggregation <50%.
• Platelet count <142,000 or > 450,000 µL.
• Presence of any tongue piercings or history of any tongue piercings in the last 90 days prior to the first study drug administration.
• Presence of braces, partials or dentures.
• Clinically significant abnormal laboratory parameters.
• Antiplatelet agents (ASA, NSAID's, P2Y12 inhibitors, etc.) within 10 days of dosing visit.
• HIV, hepatitis B or C infection.
• Presence of clinically significant cardiovascular, pulmonary, hepatic, renal, endocrinological, hematological, immunologic, metabolic, neurological, or gastrointestinal disease.
• Clinically significant physical examination.
• History of hypersensitivity or allergy to aspirin.
• History of significant bleeding disorders.
• History of peptic ulcer disease.
• History of asthma or chronic obstructive pulmonary disease.
• Concurrent corticosteroid use with the exception of topical; any previous use must have occurred at least 90 days prior to Day 1 of the study and be approved by the Investigator.
• Administration of any prescription/over the counter medications/herbal/nutritional supplements within 14 days that has an effect on platelets prior to visit1 of the study.
• Administration of any investigational drug product (IP) within 30 days prior to visit 1.
• ALT ≥ 3xULN.
• Total Bilirubin > 1.5x ULN (isolated bilirubin > 1.5x ULN is acceptable if bilirubin is fractionated and direct bilirubin < 35%).
• Donation of blood or platelets within 60 days prior to visit 1.
• Any condition, illness, or disease that in the opinion of the investigator would interfere with the subject's ability to comply with the requirements of this protocol.