Hypokalaemia
Beta2-adrenergic agonists may produce significant hypokalaemia in some patients, which has the
potential to produce adverse cardiovascular effects. The decrease in serum potassium is usually
transient, not requiring supplementation. In patients with severe COPD, hypokalaemia may be
potentiated by hypoxia and concomitant treatment (see section 4.5), which may increase the
susceptibility to cardiac arrhythmias.