Peak Bronchoprotection Conferred by Levosalbutamol and Racemic Salbutamol

Exclusion Criteria

• •1. Severe asthmatics as defined by an FEV1≤ 60% or PEF variability \> 30% or with continual daytime or nocturnal symptoms.
• •2. The use of oral corticosteroids within the last 3 months.
• •3. Recent respiratory tract infection (2 months).
• •4. Significant concomitant respiratory disease such as COPD, CF, ABPA, bronchiectasis and active pulmonary tuberculosis.
• •5. Any other clinically significant medical condition such as unstable angina, acute myocardial infarction in the preceding 3 months, recent TIA/ CVA,that may endanger the health or safety of the participant, or jeopardise the protocol.
• •6. Any significant abnormal laboratory result as deemed by the investigators
• •7. Pregnancy, planned pregnancy or lactation
• •8. Known or suspected contra-indication to any of the IMP's
• •9. Concomitant use of medicines (prescribed, over the counter or herbal) that may interfere with the trial.