This medication should not be used if the patient is already suffering from asthma
, chronic obstructive pulmonary disorder and heart problem known as AV Blocks. Patient having a problem of bronchitis, emphysema, prior record of heart disorder, congestive heart problem, thyroid, blood clotting, and myasthenia gravis should not use this medication without consulting the doctor as there might be a need of adjustment in the dosage. Women who is pregnant or planning to get pregnant should not use this medication without consulting the doctor as there it is not known whether or not it cause harm to the unborn child. Lactating mothers should consult their doctor before taking this medication as it might pass into the breast milk and cause harm to the nursed child though no such incidence has been reported yet.