Patients taking dummy pills tend to reach a plateau after a few months of physical therapy.
Prozac has shown in several trials that it can relieve depression in youngsters and adolescents significantly better than dummy pills.
Some people got dummy pills containing simple starch.
The new study was different from the rest because it involved thousands of healthy women and had a control group, with half the women taking dummy pills.
There is no scientific evidence that the treatments are any better than dummy pills, doctors said.
Hytrin was effective but Proscar offered no more relief than dummy pills in the study that involved more than 1,200 men and lasted a year.
None of the 851 minors taking dummy pills in the trials reported suicidal thinking or attempted suicide, the analysis found.
The placebo patients will get dummy anti-rejection pills.
They were randomly assigned to get either Pravachol or dummy pills.
The few studies that had been done on the early antidepressants and children showed that the drugs were no better than dummy pills.
