Antidepressant side effects reported more by patients with co-occurring panic disorder

January 4, 2017 by Sharon Parmet
Stewart Shankman, professor of psychology and psychiatry at UIC. Credit: University of Illinois at Chicago

Patients who take medication for depression report more side effects if they also suffer from panic disorder, according to a new study led by researchers from the University of Illinois at Chicago published in the Journal of Clinical Psychiatry.

The researchers looked at data from 808 patients with who were given antidepressants as part of the Research Evaluating the Value of Augmenting Medication with Psychotherapy (REVAMP) trial. Of those patients, 85 also had diagnoses of .

Among all participants, 88 percent reported at least one side effect during the 12 week trial, which ran from 2002 through 2006. Every two weeks, antidepressant were assessed, and categorized as gastrointestinal, cardiovascular, dermatological, neurological, genitourinary, sleep, or sexual functioning.

The researchers found that patients with depression and panic disorder were more likely than those with only depression to self-report gastrointestinal (47 percent vs. 32 percent), cardiovascular (26 percent vs. 14 percent), neurological (59 percent vs. 33 percent), and genital/urinary side effects (24 percent vs. 8 percent). Co-occurring panic disorder was not associated with eye or ear issues or dermatological, sleep or sexual functioning side effects compared to participants without panic disorder.

"People with panic disorder are especially sensitive to changes in their bodies," said Stewart Shankman, professor of psychology and psychiatry at UIC and corresponding author on the paper. "It's called 'interoceptive awareness.'

"Because these patients experience panic attacks—which are sudden, out-of-nowhere symptoms that include heart racing, shortness of breath, and feeling like you're going to die—they are acutely attuned to changes in their bodies that may signal another coming on. So it does make sense that these tuned-in patients report more physiological side effects with antidepressant treatment."

Response to antidepressants varies greatly, and side effects are common. Many patients who experience side effects switch medication or change dosage. Some discontinue therapy altogether.

Participants with co-occurring panic disorder were also more likely to report a worsening of their depressive symptoms over the 12 weeks if they reported multiple side effects.

"In patients with panic disorder, the more side effects they reported, the more depressed they got," said Shankman. "Whether the side effects are real or not doesn't matter, but what was real was that their worsened as a function of their side effects."

Shankman cautions that physicians and therapists should be aware that their with panic disorder may report more side effects, and they should "do a thorough assessment of these side effects to try to tease out what might be the result of hypersensitivity, or what might be a side worth switching doses or medications for."

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