FDA Issues Complete Response Letter for INTUNIV(TM) (guanfacine) Extended Release for the Treatment of ADHD in Children and A...(impulse control.(6-10)Although the mecha...),Health

Date:7/28/2009

impulse control.(6-10) Although the mechanism of action of guanfacine in the treatment of ADHD is not fully understood, preclinical research suggests this selective alpha-2A agonist strengthens working memory and prefrontal cortex neuronal firing.(6) This research supports the use of guanfacine for the treatment of ADHD.(6)

Safety was also evaluated during these pivotal trials and safety data showed that adverse events reported by participants using INTUNIV were generally mild to moderate in severity, with the most common side effects being sedative in nature.(1,2) Sedation-related, treatment-emergent adverse events were among the most common and were usually transient and mild to moderate in severity.(1,2) Treatment-related adverse events greater than 10 percent included somnolence (32 percent), headache (26 percent), fatigue (18 percent), upper abdominal pain (14 percent), and sedation (13 percent).(11) Small to modest changes in blood pressure, pulse rate, and ECG parameters were observed.(11)

About ADHD

ADHD is one of the most common psychiatric disorders in children and adolescents.(12) Worldwide prevalence of ADHD is estimated at 5.3 percent (with large variability), according to a comprehensive systematic review of this topic published in 2007 in the American Journal of Psychiatry.(13) In the United States, approximately 7.8 percent of all school-aged children, or about 4.4 million children aged 4 to 17 years, have been diagnosed with ADHD at some point in their lives, according to the Centers for Disease Control and Prevention (CDC).(14) The disorder is also estimated to affect 4.4 percent of US adults aged 18 to 44 based on results from the National Comorbidity Survey Replication.(15) When this percentage is extrapolated to the full US population aged 18 and over, approximately 9.8 million adults are believed to have ADHD.(16)

ADHD is a psychiatric behavioral disorder that manif
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