Dexmedetomidine可提供鎮靜、安眠及止痛作用，其作用機轉為何？
γ-amino-butyric acid inhibition
\mathrm{\alpha}_{2}-adrenergic agonist
\mathrm{\alpha}_{2}
µ receptor agonist
N-methyl-D-aspartate receptor inhibition
