Dr. Abboud Assaf, one of the most notable psychiatrists in Lebanon, said in his website that:
Common Misconceptions: Psychiatric Disorders are incurable
Are psychiatric disorders (e.g. depression) curable?
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Yes, some psychiatric disorders are curable.
I was chatting to a research psychologist once about treatability of mental disorders. She told me specific phobias are easily treated with a high success rate with a single session with a therapist.
Here is one example study that looked at arachnophobes, and agrees that a single session with a therapist is effective.
The proportion of clinically significant improved patients at follow-up was 80% in the therapist-directed group
Unreferenced Aside: I was very surprised, and asked if phobias are so easy to treat, why are there people still suffering from them? Apparently, people convince themselves that, while they have a phobia, they aren't suffering from it, and don't seek treatment. I offer no evidence of this; it is an appeal to an unnamed authority, but I found it interesting, nonetheless.