Am J Psychiatry 164:3, March 2007
This article is featured in this month’s AJP Audio.
Lessons From Each Drug Trial
S electing an antipsychotic would be relatively easy if all patients responded similarly and
if the most effective drug had the mildest side effects. Sadly, this is not the case. Each new
publication of the findings from the Clinical Antipsychotic Trials of Intervention Effective-
ness (CATIE) seems to provide an unexpected finding that becomes understandable through
the rich database of this large, multicenter trial. The article by Stroup and his CATIE collabo-
rators in this issue of the Journal documents how a group of patients with schizophrenia who
are defined by a particular drug response differ from others in how they respond to a number
of second-generation antipsychotics.
The patients in this study were individuals who were randomly assigned to perphena-
zine during phase 1 of CATIE and later discontinued that treatment for lack of efficacy, in-
tolerability, or other reasons. These patients were then randomly assigned in phase 1B to
a double-blind comparison of olanzapine, ris-
peridone, and quetiapine. As in other CATIE trials,
the effectiveness of each of these three drugs was
measured by the time to drug discontinuation for
any reason. The surprising finding is that the rela-
tive effectiveness of the three drugs differed sub-
stantially from that in phase 1. The time to dis-
continuation in phase 1B was longest for
quetiapine, followed by olanzapine and then ris-
peridone. In phase 1 (1), olanzapine had the ef-
fectiveness advantage, followed by risperidone and then quetiapine. In phase 2E (2),
which included patients who left phase 1 and who were willing to be randomly assigned
to clozapine, clozapine had the advantage, followed by olanzapine, then quetiapine, and
then risperidone. In phase 2T (3), which included patients who left phase 1 because of in-
tolerability of the assigned drugs or because they were unwilling to receive clozapine, the
time to discontinuation was longest for risperidone, followed by olanzapine, and then
There were no meaningful differences among the demographic characteristics of the
study groups. This suggests that there is information in the responses of these individuals to
an antipsychotic and that this information can be helpful in predicting drug responses.
Stroup and colleagues consider the possibility that a defining characteristic of the study
group in phase 1B is their sensitivity to the side effects of perphenazine. For example,
among the patients who discontinued perphenazine because of extrapyramidal side ef-
fects, five of six also discontinued risperidone. This suggests that patients who experience
extrapyramidal symptoms while taking perphenazine may represent a group of individuals
with a greater sensitivity to this side effect and that these individuals will experience varying
amounts of extrapyramidal symptoms while taking risperidone. Similarly, this group of in-
dividuals may do well with quetiapine, an antipsychotic with minimal extrapyramidal side
effects. However, there were no differences among the three agents in the scores on rating
scales for extrapyramidal side effects, akathisia, or tardive dyskinesia. This inconsistency
may tell us something about mild extrapyramidal symptoms and how difficult they can be
The observations of expert clinicians made nearly 30 years ago may be useful to today’s
prescribers. At that time there was a concern that many clinicians were failing to appreci-
ate that milder forms of akathisia and akinesia can be confused with depression and anx-
iety (4, 5). Van Putten observed that individuals with subjective akathisia may describe
“The observations of
expert clinicians made
nearly 30 years ago may be
useful to today’s
Am J Psychiatry 164:3, March 2007
themselves as feeling anxious, uncomfortable, or irritable (6). These patients often do not
demonstrate restless movements. He also observed that even a mild internal feeling of
restlessness can be tormenting if a person experiences it all of his or her waking hours.
Mild parkinsonism can also be difficult to detect. Experienced clinicians learned that they
could detect mild rigidity by looking for a decrease in normal arm swing or a lack of ex-
pressive gestures. Individuals with mild parkinsonism may also feel slower.
It would not be surprising if the raters from CATIE were not sensitive to these mild
manifestations. The raters did not rate any patients as having substantial increases
in akathisia on the Barnes Akathisia Scale or extrapyramidal side effects on the Sim-
pson-Angus Scale. There are suggestions that these vague symptoms could explain
the differences among the drugs. The number of patients who discontinued treat-
ment because of adverse effects was relatively small. The higher rate of discontinu-
ation for olanzapine was probably a result of weight gain or sedation, which are rel-
atively easy to detect. Mild extrapyramidal side effects may be embedded in the 32%
of the risperidone patients whose discontinuation was classified as “patient deci-
sion.” These may have been individuals who disliked their drug but were unable to
give an explanation that could be categorized as a side effect. If these observations
are correct, it suggests that CATIE may have been relatively insensitive to milder
forms of extrapyramidal side effects. This would not be surprising, since it is difficult
to train raters in measuring mild akathisia and rigidity. It would also not be surprising
if these side effects were also underestimated by the treating psychiatrists, since
many busy clinicians are unlikely to systematically evaluate patients for extrapyrami-
dal symptoms. The complexity is compounded by the difficulty schizophrenia pa-
tients may have in describing their subjective experiences from a medication.
These speculations about mild extrapyramidal side effects as an explanation for
the differences among these drugs are only weakly supported by the study data.
Nevertheless, they suggest an important principle for treating schizophrenia. Find-
ing an antipsychotic regimen that patients can live with comfortably is an essential
part of an effective management strategy. Each antipsychotic trial provides an op-
portunity to understand the factors—particularly the side effect sensitivity—that may
affect how a patient feels while taking the next drug.
1. Lieberman JA, Stroup TS, McEvoy JP, Swartz MS, Rosenheck RA, Perkins DO, Keefe RS, Davis SM, Davis CE, Leb-
owitz BD, Severe J, Hsiao JK: Effectiveness of antipsychotic drugs in patients with chronic schizophrenia. N
Engl J Med 2005; 353:1209–1223
2. McEvoy JP, Lieberman JA, Stroup TS, Davis SM, Meltzer HY, Rosenheck RA, Swartz MS, Perkins DO, Keefe RSE,
Davis CE, Severe J, Hsiao JK, for CATIE Investigators: Effectiveness of clozapine versus olanzapine, quetiapine,
and risperidone in patients with chronic schizophrenia who did not respond to prior atypical antipsychotic
treatment. Am J Psychiatry 2006; 163:600–610
3. Stroup TS, Lieberman JA, McEvoy JP, Swartz MS, Davis SM, Rosenheck RA, Perkins DO, Keefe RSE, Davis CE, Se-
vere J, Hsiao JK, for the CATIE Investigators: Effectiveness of olanzapine, quetiapine, risperidone, and ziprasi-
done in patients with chronic schizophrenia following discontinuation of a previous atypical antipsychotic.
Am J Psychiatry 2006; 163:611–622
4. Quitkin F, Rifkin A, Klein DF: Very high dosage vs standard dosage fluphenazine in schizophrenia. A double-
blind study of nonchronic treatment-refractory patients. Arch Gen Psychiatry 1975; 32:1276–1281
5. Rifkin A: The risks of long-term neuroleptic treatment of schizophrenia: especially depression and akinesia.
Acta Psychiatr Scand Suppl 1981; 291:129–136
6. Van Putten T: The many faces of akathisia. Compr Psychiatry 1975; 16:43–47
STEPHEN R. MARDER, M.D.
Address correspondence and reprint requests to Dr. Marder, Semel Institute for Neuroscience at UCLA, Mental
Illness Research, Education and Clinical Center, VA West Los Angeles Health Care Center, MIRECC 210A, 11301
Wilshire Blvd., Los Angeles, CA 90073-1003; firstname.lastname@example.org (e-mail).
Dr. Marder reports receiving research support from Eli Lilly and Janssen and serving on advisory boards for
Bristol-Myers Squibb, Merck, Otsuka, Pfizer, Roche, Solvay, and Wyeth. Dr. Freedman has reviewed this edito-
rial and found no evidence of influence from these relationships.