A sensitive radioimmunoassay for chlorpromazine is described. To prepare the chlorpromazine selective antiserum, an antigen is made comprising chlorpromazine covalently bonded to an immunogenic carrier material through a diazo containing linking group and the antigen is injected into a suitable host mammal to elicit the desired antiserum. A preferred linking group is diazophenylcarbonyl while bovine serum albumin is a preferred immunogenic carrier material.
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