Relapse rates after 12 months of venlafaxine XR treatment were 6.7% for patients who were taking venlafaxine XR for the full 18 months, 20.0% for patients taking placebo for 12 months (months 6 to 18), and 32.3% for placebo patients who switched at month 12 to placebo (P < .14).
The study also found that patients treated with venlafaxine XR for 12 months before being shifted to placebo experienced a lower relapse rate (32.4%) than patients shifted to placebo after taking venlafaxine XR for only 6 months (53.7%; P < .03).
Chronic Anxiety Requires Long-Term Treatment to Prevent Relapse
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