Behavioral problems - which drugs to use? or not?

I went to a really great lecture (by Eric Hutchinson)  a week or so ago, and as a result today we are back to the topic of treating behavioral problems... using, as he describes it, a mechanistic approach.  So here are some questions for your perusal...

1. What are some common abnormal behaviors in NHP? 
2. If a basic behavior loop is stimulus -> internal processing -> behavior -> feedback, which of those steps can most be influenced by veterinary medicine alone (i.e. without behavioral management techniques)? Which can be influenced by behavioral management? 
3. Barbering or hair pulling is a relatively common behavior in multiple species, including humans. 
•     What is thought to be the primary physiologic mechanism, 
•     What is the usual treatment, and 
•     Why does it have a wide safety margin?
4.    Benzodiazepines are sometimes suggested for treatment for behavioral problems 
• How do benzodiazepines work in the brain? 
• True or false: benzodiazepines are useful for a wide range of problem behaviors 
• For what kind of conditions would they be appropriate to use? 
• When should they never be used? 

      5. Self-injurious behavior

1. What conditions of rearing predispose an animal to develop self-injurious behavior?
2. What is thought to be the neurochemical deficit in self-injurious behavior?
•  Which amino acid has proven useful in treating abnormal behaviors due to abnormal rearing? 
• What category of drugs with a similar downstream mechanism to Q3 effects is often useful for self injurious behavior? 
• Which member of this drug category takes up to a month to work, has off-target effects and has withdrawal effects? 
• Which member of this drug category is not useful >8 weeks but has no withdrawal effects? 
3. Which alpha 2A adrenergic agonist has proven useful in the most severe cases of self injurious behavior in NHP? 
• What are some advantages of this drug? 
• What are some disadvantages? 
4. Which drug could you use occasionally prior to a known trigger for self injurious behavior to help prevent it? 

      6. General concept: What effect on behavior would you expect on withdrawing drug treatment therapy?
ANSWERS POSTED HERE

Some references:

Risk factors for stereotypic behavior and self-biting

Physiology and neurochemistry of self injurious behavior