We performed a double-blind, multicenter study, comparing MMX mesalamine vs placebo for the treatment of active ulcerative colitis.
我们进行了一项双盲，多中心研究，比较了美沙美拉明与美沙酮对安慰剂治疗活动性溃疡性结肠炎的疗效。
2
The rest received a "dummy" placebo pill with no active ingredients.
剩下的一半志愿者则每天服用一颗“假的”没有有效成分的安慰剂。
3
In 2004, they showed that the two most common active ingredients in cough syrup, dextromethorphan and diphenhydramine, had the same effectiveness in treating cough symptoms as a placebo ingredient.