The measures used in studies of major tranquilisers are done using PANSS, BPRS and other standardised tools.
Within these measures there is one which is vital to patients: the effectiveness of reducing delusions and hallucinations. This is why patients take antipsychotics.
It is not the sole measure. To any patient is should be. To psychiatry the major tranquiliser offers other benefits.
Strangest of all, there's no review which conclusively explores this. As far as I am aware all that is required is to reanalyse the data from previous placebo controlled randomised control trials of antipsychotics. Let the sole measure used be the one which antipsychotics, in lay people's language, are meant to be. They're meant to reduce the delusions.
My guess is many of these medications aren't as effective as patients hope.
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