Their duration of action was longer than that of lidocaine.Co-administration of dextromethorphan and its metabolites produced additive effect on sciatic nerve blockade.

• 而且当右美沙芬、右啡烷、甲氧基吗啡喃与利多卡因合并给予在大白鼠周边的坐骨神经阻断上亦具有加成作用。