Can zyprexa and phentermine be taken together?

I am seeing a licensed physician in VA. I have been slowly increased in my phentermine to two 37.5mg tablets a day. When my weight slowed down he added 10mg of Prozac. I trust my physician and I have lost over 17lbs in 25 days. He says that the Prozac will speed things along. I know several people who are already doing this combination with great success!