α-yohimbine

18β-Hydroxy-3-epi-α-yohimbine, a derivative of yohimbine, is a natural product found in Rauvolfia vomitoria [1].

Yohimbine hydrochloride (Antagonil) is a plant alkaloid with alpha-2-adrenergic blocking activity. Yohimbine has been used as a mydriatic and in the treatment of ERECTILE DYSFUNCTION.

Yohimbine is a nonselective alpha 2-adrenergic receptor (AR) antagonist(IC50 : 0.6 μM)

Rauwolscine hydrochloride (Isoyohimbine hydrochloride) , a natural alkaloid, is a specific and reversible α2-adrenergic receptor antagonist (Ki: 12 nM) [1]. It is a stereoisomer of yohimbine, which potently antagonizes both α1- and α2-adrenergic receptors [1]. Rauwolscine hydrochloride also acts as a receptor antagonist at the serotonin 5-HT2B receptor (Ki: 14.3 nM) and as a weak partial agonist at 5-HT1A (IC50: 1.3 μM) [3]. The α2-adrenergic receptor has diverse physiological functions and antagonists like rauwolscine have numerous applications, including the modulation of mood and behavior [5].

Alpha-Yohimbine is a 5-HT1A receptor agonist, it is strong selective 2-adrenoceptor antagonist. Alpha-Yohimbine possess aphrodisiac effect.