Method, composition of matter and kit for determining the concentration of neuroleptic drug(s) in an animal or human patient's body fluid e.g., blood serum, blood plasma, urine, saliva, spinal fluid, etc., which comprises combining the patient's body fluid with dopamine receptor material and radioactive dopamine receptor binder and then measuring the percent inhibition of binding of the radioactive binder by the drug in the patient's fluid. The kit for performing the above method includes dopamine receptor material and radioactive dopamine receptor binder.
Neuroleptic radioreceptor assay method and kit