For example, cognitive-behavioral therapy (CBT) has been shown to be the most effective treatment for PTSD and has the fewest side-effects, yet many psychologists do not use this method. Baker and colleagues cite one study in which only 30 percent of psychologists were trained to perform CBT for PTSD and only half of those psychologists elected to use it. That means that six of every seven sufferers were not getting the best care available from their clinicians. Furthermore, CBT shows both long-term and immediate benefits as a treatment for PTSD; whereas medications such as Paxil have shown 25 to 50 percent relapse rates.
From: "Where's the science? The sorry state of psychotherapy."