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目的：观察右美沙芬和左旋延胡索治疗干咳的临床疗效。方法：对６３例病人进行随机分组盲法试验，右美沙芬组２２例，剂量为１５ｍｇ１天３次；左旋延胡索组２０例，剂量为３０ｍｇ１天３次；对照组２１例，给予安慰剂，１片１天３次。疗程均为３天。结果：镇咳明显有效率：右美沙芬组为９１％，左旋延胡索组为７５％，对照组为５３％。３组比较疗效有显著性差异（Ｐ＜０．００５～０．０５），不良反应少。结论：说明右美沙芬和左旋延胡索均可用于干咳的治疗。
Objective: To observe the clinical efficacy of dextromethorphan and levo-corydalis in the treatment of dry cough. Methods: Sixty-three patients were randomly divided into blinded trial, dextromethorphan group (n = 22), nimodipine (15 mg once daily for three days), levosulfan group (n = 20) 3 times a day. Treatment are 3 days. Results: Antitussive was effective in 91% of dextromethorphan, 75% of levosulfan and 53% of control. The efficacy of the three groups was significantly different (P <0.005 ~ 0.05), less adverse reactions. Conclusion: Dextromethorphan and levocerane can be used to treat dry cough.