Some reviews of research sponsored by the makers of antipsychotic drugs claim that about 40 to 50 percent of people have a good response to medication, 30 to 40 percent have a partial response, and 20 percent have an unsatisfactory response (after 6 weeks on two or three different drugs). Other research from The British Journal of Psychiatry were more negative and claimed that "the clinical relevance of antipsychotics is in fact limited". This study included 22 428 patients and 11 antipsychotic drugs.