Useless drugs are not placebos.
D001480:Basal Ganglia Diseases / Q000139:chemically induced; D002936:Cinnarizine / Q000009:adverse effects; D002986:Clinical Trials as Topic; D005444:Flunarizine / Q000009:adverse effects; D006801:Humans; D010353:Patient Education as Topic; D010919:Placebos; D011897:Random Allocation
D010919:Placebos; D002936:Cinnarizine; D005444:Flunarizine