Should not be used as treatment for acute asthma symptoms. May worsen conditions if use during exacerbation of asthma attack. Treatment should not be stopped abruptly. Patients w/ pulmonary TB, severe CV disorders, heart rhythm abnormalities, DM, thyrotoxicosis, uncorrected hypokalemia or patients predisposed to low levels of serum K. Discontinue use, assess patient & institute alternative therapy if increase in wheezing after dosing occur. Possible systemic effects may occur during long-term therapy. Avoid concomitant use w/ ritonavir, ketoconazole or other potent CYP3A4 inhibitors. May develop pneumonia in patients w/ severe COPD. Black African or Afro-Caribbean patients. Pregnancy & lactation.