Adrenergic receptor agonists are usually divided into α-adrenergic receptor agonists and β-adrenergic receptor agonists. α-adrenergic receptors are divided into α1 and α2 adrenergic receptor agonists, for α1 adrenergic receptor agonists such as phenylephrine, α2 adrenergic receptor agonists usually include hydroxyzoline. β-adrenergic receptor agonists are also divided into β1 and β2 receptor agonists, β1 adrenergic receptor agonists include dobutamine and β2 adrenergic receptor agonists include salbutamol. However, isoprenaline has agonistic effects on both β1 and β2 receptors, and adrenergic drugs have a wide range of effects on emergency resuscitation.