Chakos M, Lieberman J, Hoffman E, Bradford D, Sheitman B Effectiveness of second-generation antipsychotics in patients with treatment-resistant schizophrenia: a review and meta-analysis of randomized trials. Am J Psychiatry. 2001 Apr;158(4):518-26.
Ganguli R, Brar JS, Mahmoud R, Berry SA, Pandina GJ Assessment of strategies for switching patients from olanzapine to risperidone: a randomized, open-label, rater-blinded study. BMC Med. 2008 Jun 30;6:17. doi: 10.1186/1741-7015-6-17.
Kane J, Honigfeld G, Singer J, Meltzer H Clozapine for the treatment-resistant schizophrenic. A double-blind comparison with chlorpromazine. Arch Gen Psychiatry. 1988 Sep;45(9):789-96.
Ronaldson KJ, Fitzgerald PB, Taylor AJ, Topliss DJ, Wolfe R, McNeil JJ Rapid clozapine dose titration and concomitant sodium valproate increase the risk of myocarditis with clozapine: a case-control study. Schizophr Res. 2012 Nov;141(2-3):173-8. doi: 10.1016/j.schres.2012.08.018. Epub 2012 Sep 23.
Souza JS, Kayo M, Tassell I, Martins CB, Elkis H Efficacy of olanzapine in comparison with clozapine for treatment-resistant schizophrenia: evidence from a systematic review and meta-analyses. CNS Spectr. 2013 Apr;18(2):82-9. doi: 10.1017/S1092852912000806. Epub 2012 Dec 20. Review.
Stip E, Zhornitsky S, Potvin S, Tourjman V Switching from conventional antipsychotics to ziprasidone: a randomized, open-label comparison of regimen strategies. Prog Neuropsychopharmacol Biol Psychiatry. 2010 Aug 16;34(6):997-1000. doi: 10.1016/j.pnpbp.2010.05.010. Epub 2010 May 12.
Warnez S, Alessi-Severini S Clozapine: a review of clinical practice guidelines and prescribing trends. BMC Psychiatry. 2014 Apr 7;14:102. doi: 10.1186/1471-244X-14-102. Review.
Weiden PJ, Simpson GM, Potkin SG, O'Sullivan RL Effectiveness of switching to ziprasidone for stable but symptomatic outpatients with schizophrenia. J Clin Psychiatry. 2003 May;64(5):580-8.
Switching Antipsychotics: Abrupt Discontinuation Versus Overlap
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.