Anxiety in Bipolar Disorder: Data on Cotreatment Are Lacking, but Anecdotally, Antimanics and Antipsychotics Have Proven Useful

By Sherman, Carl | Clinical Psychiatry News, October 2005 | Go to article overview

Anxiety in Bipolar Disorder: Data on Cotreatment Are Lacking, but Anecdotally, Antimanics and Antipsychotics Have Proven Useful


Sherman, Carl, Clinical Psychiatry News


Until recently, discussions of bipolar comorbidity centered on substance abuse. It is now recognized, however, that anxiety is at least as prevalent in bipolar patients and has a substantial negative effect on the course of the mood disorder.

Analysis of data from the first 500 participants in the multicenter Systematic Treatment Enhancement Program for Bipolar Disorder (STEP-BD) found that more than half had a lifetime history of an anxiety disorder, that current prevalence was nearly one-third, and that rates were higher for bipolar I than II. Figures reported elsewhere have been even higher. The presence of comorbid anxiety was associated with lower rates of recovery, reduced functioning, and an increased risk of suicide attempts (Am. J. Psychiatry 2004;161:2222-9).

Various studies have identified panic disorder, generalized anxiety disorder (GAD), and social phobia as the most common comorbidities, although obsessive-compulsive disorder (OCD) and posttraumatic stress disorder (PTSD) are seen as well.

The nature of the bipolar/anxiety association is uncertain, said Naomi Simon, M.D., associate director of the anxiety disorders program at Massachusetts General Hospital, Boston, and lead author of the STEP-BD report. "Whether anxiety comorbidity is a bipolar subtype and a marker of poor outcome or they are two distinct conditions is not clear," she said.

In either case, the reasons for identifying anxiety are compelling. "Bipolar patients should be screened for comorbidity because it's such a powerful risk factor for suicide and poor outcomes. Patients need to be monitored more closely in the presence of anxiety," Dr. Simon pointed out.

Although worthy for its own sake, effective anxiety treatment alone hasn't been shown to ameliorate bipolar disorder, nor is there evidence of efficacy, in this context, for any particular drug. "We are so profoundly behind the curve in understanding and identifying anxiety in bipolar disorder that we don't have data to talk about cotreatment," said Mark S. Bauer, M.D., professor of psychiatry and human behavior at Brown University in Providence, R.I.

Without such data, the most reasonable treatment options would seem to be drugs that are used for anxiety generally. This decision, however, is complicated by the fact that the two medication classes validated for this indication--benzodiazepines and antidepressants--carry substantial risks in the context of bipolar disorder: abuse with the first and manic switching with the second.

Bipolar treatment itself may ameliorate anxiety. But in light of the dangers associated with the primary disorder, this must have a second level of priority in drug selection after primary mood stabilization. "There is probably a difference in the anxiolytic effects of mood stabilizers, but good long-term, well-tolerated mood stabilization is truly the first thing," Dr. Simon noted. Atypical antipsychotics as a class appear to reduce anxiety, and lithium does not, "but there's such good evidence for effective mood stabilization and protection against suicide, I might choose it anyway as the first-line mood-stabilizing agent."

In some cases, anxiety resolves when mood stabilization is optimized. If not, adjunctive medication is needed.

On the use of antidepressants, there is no consensus. "I'd say that people [are becoming] more aggressive in treating depression with antidepressants, and the same would be true of anxiety disorders," Dr. Bauer said.

With "a good antimanic agent on board ... there's less worry about switching and more worry about chronic, undertreated anxiety.

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Anxiety in Bipolar Disorder: Data on Cotreatment Are Lacking, but Anecdotally, Antimanics and Antipsychotics Have Proven Useful
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