The α2 adrenergic receptor is a G protein-coupled receptor (GPCR). Until now, three different α2-receptor subtypes have been identified: α2A, α2B, and α2C. The α2-adrenergic receptor exists in vascular prejunctional terminals and inhibits the release of norepinephrine in a form of negative feedback. The α2 adrenergic receptor agonists produce diverse responses, including analgesia, sedation, anxiolysis, and sympatholysis [3]. L-type calcium channels are responsible for the excitation-contraction coupling of skeletal, cardiac muscle, smooth, and for aldosterone secretion in endocrine cells of the adrenal cortex [4].
Fendiline inhibited the activity of