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枳实对乙酰胆碱（Ａｃｈ）及高Ｋ＋去极化后Ｃａ２＋所引起的小鼠离体小肠收缩均有比较明显的抑制作用，其作用均可通过增加浴液中的Ｃａ２－浓度而被对抗。累积量效曲线表明：枳实与ＣａＣｌ２呈非竞争性拮抗，两种浓度的枳实对Ａｃｈ所致的依细胞外Ｃａ２２＋的收缩反应有较强抑制作用，而对依细胞内Ｃａ２＋的收缩反应无明显抑制作用。枳实与维拉帕米相似，为Ｃａ２＋拮抗剂。
Astragalus membranaceus (Ach) and high K + depolarization of Ca2+ induced mice have obvious inhibitory effects on the isolated small intestine contraction, and their effects can be counteracted by increasing Ca2- concentration in the bath. Cumulative dose-response curve showed that: Tribulus terrestris and CaCl2 exhibited non-competitive antagonism, and two concentrations of Tribulatum showed a strong inhibitory effect on the contractile response to extracellular Ca22+ induced by Ach, but no contraction response to intracellular Ca2+. Obvious inhibitory effect. Morinda is similar to verapamil and is a Ca2+ antagonist.