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Common PTSD Drug is No More Effective Than Placebo

Guanfacine, a medication commonly prescribed to alleviate symptoms of post-traumatic stress disorder, is no more effective than a placebo, according to a study// led by researchers at the San Francisco VA Medical Center.

“There was no benefit at all, and there were several adverse side effects,” says lead author Thomas Neylan, MD, medical director of the PTSD treatment program at SFVAMC. “People with symptoms of PTSD should probably stay away from this drug and others of its type.”

The study appears in the December 1, 2006 issue of the American Journal of Psychiatry.

Guanfacine belongs to a class of medications known as alpha-2 agonists, which lower the brain’s supply of the neurotransmitter norepinephrine. Neurotransmitters are chemicals that transmit electrical signals between nerve cells. They are responsible for many aspects of behavior.

“Norepinephrine is released in the brain during states of excited arousal, and PTSD is associated with that state – patients startle easily, have trouble sleeping, and are hypervigilant and anxious,” explains Neylan, who is also an associate professor of psychiatry at the University of California, San Francisco.

Guanfacine and clonidine, another alpha-2 agonist, are commonly prescribed for PTSD symptoms. “There are at least 20 peer-reviewed articles published in the field of PTSD that recommend drugs which lower norepinephrine,” Neylan says. “However, ours was the first randomized, controlled study of alpha-2 agonists for symptoms of PTSD.”

The double-blind study compared the effects of guanfacine and an identical looking placebo pill on 63 male and female veterans at four VA medical centers in California and Hawaii. Twenty-nine participants were randomly assigned to take weekly doses of the drug, and 34 were assigned the placebo, for eight weeks.

At the end of the study, the effect of guanfacine on PTSD symptoms was “zero,” and there were no d
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