Dr. Nasrallah responds
Thanks to my colleagues, Drs. Diamond, Glaser, and Kerlinsky, for their cogent letters about my editorial.
To Dr. Glaser: The “ethics” of conducting placebo-controlled studies when developing a new antipsychotic has been raging for some time. For decades, the FDA has insisted on using a placebo group because around 25% to 30% of research participants respond to placebo, and because participants receiving placebo also complain of many adverse effects. So a new drug has to demonstrate a statistically higher efficacy than a placebo, and the adverse effect profile of the placebo group will put the safety and tolerability profile of a new drug in proper perspective. However, in Europe, they do not conduct placebo-controlled studies; instead, they conduct what is called a “non-inferiority” trial of a new antipsychotic compared with a well-established antipsychotic.
Interestingly, even though the discovery of the neurodegenerative effects of untreated psychosis was only 20 years ago (in 1997 after serial MRI scans revealed progressive atrophy), in the 1960s, the first antipsychotic, chlorpromazine, was compared with placebo in a large national study for 6 months. This study showed without a doubt that chlorpromazine has a higher efficacy than placebo. After the study was done, Dr. Philip May at University of California, Los Angeles looked at what happened to the psychotic patients who received placebo for 6 months and found that they became less responsive to treatment, were re-hospitalized more often, and had more negative symptoms and a poorer overall outcome. That was a clue that untreated psychosis can be harmful, and it supports your point about the ethics of using placebo. In contemporary studies, a trial of oral antipsychotics is 6 weeks, not 6 months. In the year-long, placebo-controlled studies of injectable antipsychotics in stable patients, those who show the slightest increase in delusions, hallucinations, or suicidal/homicidal behavior were promptly taken out of the study and treated. This reduced the “harm,” although not completely. Perhaps the FDA will change its policies and adopt the non-inferiority model. That’s what is done with nonpsychiatric disorders such as pneumonia, stroke, or diabetes. But one last fact has to be stated: The placebo response in anxiety, depression, or psychosis is much higher (25% to 35%) than the 1% placebo response in pneumonia.
To Dr. Diamond: I really like DASH, and it is an acronym for quick symptomatic diagnosis. Speedy treatment then follows with the acronym RAPID to prevent brain damage that gets worse with delay.
As for the second issue of tapering off the antipsychotic medication, the evidence is overwhelming in favor of continuous pharmacotherapy. Just as hypertension and diabetes will return if medications are tapered or stopped, so will psychosis, and vengefully so because treatment resistance increases with each relapse.1 This is also true for bipolar disorder recurrences.2 A recent 20-year follow-up study showed that stopping antipsychotic treatment is associated with a much higher mortality rate than continuation therapy.3 Another 7-year study showed the same thing.4 It is literally deadly, and not just neurodegenerative, for persons with schizophrenia to stop their medications.
To Dr. Kerlinsky: I agree with you about using certain adjunctive pharmacotherapies for acute psychosis, which is associated with neuroinflammation, oxidative stress, and neuropil and myelin damage. I support using agents with anti-inflammatory effects (such as minocycline and omega-3 fatty acid), antioxidant effects (such as N-acetylcysteine), and neuroprotective effects (such as minocycline, clemastine, lithium, vitamin D, erythropoietin, etc.). I refer you to my past editorial, “Are you neuroprotecting your patients? 10 Adjunctive therapies to consider,”5 in which I mentioned all the above. I also pointed out the many neuroprotective effects of atypical antipsychotics in another editorial.6 Although off-label, those supplements can be useful interventions that can ameliorate the gray and white matter damage associated with acute psychotic relapses in patients with schizophrenia.
Henry A. Nasrallah, MD
Editor-in-Chief
The Sydney W. Souers Endowed Chair
Professor and Chairman
Department of Psychiatry and Behavioral Neuroscience
Saint Louis University School of Medicine
St. Louis, Missouri
References
1. Emsley R, Oosthuizen P, Koen L, et al. Comparison of treatment response in second-episode versus first-episode schizophrenia. J Clin Psychopharmacol. 2013;33(1):80-83.
2. Post RM. Preventing the malignant transformation of bipolar disorder. JAMA. 2018;E1-E2.
3. Tiihonen J, Tanskanen A, Taipale H. 20-year nationwide follow-up study on discontinuation of antipsychotic treatment in first-episode schizophrenia. Am J Psychiatry. 2018;175(8):765-773.
4. Taipale H, Mittendorfer-Rutz E, Alexanderson K, et al. Antipsychotics and mortality in a nationwide cohort of 29,823 patients with schizophrenia. Schizophr Res. 2018;197:274-280.
5. Nasrallah HA. Are you neuroprotecting your patients? 10 Adjunctive therapies to consider. Current Psychiatry. 2016;15(12):12-14.
6. Nasrallah HA. A decade after the CATIE study, the focus has shifted from effectiveness to neuroprotection. Current Psychiatry. 2015;14(2):19-21.