Sounds like he is very territorial. And aggression is a breed trait in the Bengal.
You can read about the use of prozac here
http://www.petplace.com/article.aspx?id=4956
It can take 1-4 weeks before you see an effect.
You should watch for side effects such as stomach upset, tiredness, anxiety, restlessness, panting, irritability, jaundice (yellowing of the gums, skin, or whites of the eyes), vomiting, or a persistent lack of appetite while being treated and contact your vet if these occur.
Clomipramine is another drug used for this
http://www.petplace.com/article.aspx?id=1562
and valium might work too
http://www.petplace.com/article.aspx?id=1517
Hope this helps you!
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