placebo-controlled
adjective medical specialized uk/pləˌsiː.bəʊ.kənˈtrəʊld/ us/pləˈsiː.boʊ.kənˌtroʊld/
（药品的临床试验中）有服用安慰剂的对照组的
relating to a drug trial in which the drug being tested is compared with a placebo (= a substance containing no medicine)