title: Chlorpromazine versus reserpine for schizophrenia.
abstract: BACKGROUND
  In the 1940s reserpine, refined from a plant extract that had been used for centuries, began to be used as a treatment for people with mental disorders and was one of the very first antipsychotic drugs. Its irreversible pharmacological potency and adverse effects meant that it has been withdrawn in the UK and its role has been superceded by 'newer' compounds. The effects of reserpine are of historical interest although there are some reports of it still being used in highly specialist situations in psychiatry. Chlorpromazine is also an old drug but it is still used for treatment of people with schizophrenia.
  
  
  OBJECTIVE
  To investigate the effects of two old medications (reserpine and chlorpromazine) for people with schizophrenia. Reserpine is now rarely used while chlorpromazine remains on the essential list of drugs of the World Health Organization (WHO).
  
  
  METHODS
  We searched the Cochrane Schizophrenia Group's Study-Based Register of Trials (24 March 2016).
  
  
  METHODS
  We included randomised clinical trials focusing on chlorpromazine versus reserpine for schizophrenia that presented useable data.
  
  
  METHODS
  We extracted data independently. For binary outcomes, we calculated risk ratio (RR) and its 95% confidence interval (CI), on an intention-to-treat basis. We employed a fixed-effect model for analyses. We assessed risk of bias for included studies and created a 'Summary of findings' table using GRADE.
  
  
  RESULTS
  The review currently includes nine studies with an average 60 participants per study. All of these studies are now over 60 years old, conducted between 1955 and 1962. When chlorpromazine was compared with reserpine for people with schizophrenia, improvement in global state was better at short term for those receiving chlorpromazine (n = 781, 6 RCTs, RR 'not improved' 0.75 95% CI 0.62 to 0.92, low-quality evidence). Short-term improvement in paranoid distortion was measured using the Multidimensional Scale for Rating Psychiatric Patients (MSRPP). Data showed no clear difference between treatment groups (n = 19, 1 RCT, RR 1.33 95% CI 0.62 to 2.89, very low-quality evidence). There was no difference in functioning: occupational adjustment, medium term (n = 40, 1 RCT, RR 0.83 95% CI 0.47 to 1.47, moderate-quality evidence) and general behaviour (n = 98, 1 RCT, RR 0.79 CI 0.41 to 1.53, moderate-quality evidence). Adverse events were poorly reported. For 'toxic reaction' there was, again, no obvious difference between the two compounds (n = 210, 3 RCTs, RR 1.68 95% CI 0.43 to 6.54, moderate-quality evidence), and this also applied to leaving the study early (n = 229, 4 RCTs, RR 1.16 95% CI 0.94 to 1.42, moderate-quality evidence).
  
  
  CONCLUSIONS
  Judged by standards of today, the evidence is largely of limited quality. However, some of these 1950s studies are remarkable in their foresight and clarity. Reserpine did have some effect on global state - but chlorpromazine did seem to perform better. Important issues regarding adverse effects were not really addressed by these trials. Chlorpromazine remains on the WHO list of essential drugs. Reserpine is now almost obsolete, although, probably as a result of evidence other than that reported in the pioneering trials used in this review.
authors.affiliation: Computer Science, Hochschule Ulm, University of Applied Sciences, Prittwitzstraße 10, Ulm, Germany, 89075.
authors.forename: Selin
authors.initials: S
authors.lastname: Nur
authors.forename: Clive E
authors.initials: CE
authors.lastname: Adams
mesh_terms: D014150:Antipsychotic Agents / Q000009:adverse effects / Q000627:therapeutic use*; D002746:Chlorpromazine / Q000009:adverse effects / Q000627:therapeutic use*; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012110:Reserpine / Q000009:adverse effects / Q000627:therapeutic use*; D012559:Schizophrenia / Q000188:drug therapy*
chemical_list: D014150:Antipsychotic Agents; D012110:Reserpine; D002746:Chlorpromazine