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Generally it isn't recommended to use Geodon and Invega together because it risks an irregular heart rhythm. You can read more here:
Of course, the same is true of Geodon and fluphenazine.
Switching drugs is something you will need to discuss with your psychiatrist. Only he or she is in a position to help you decide if it's worth the risk, especially since you are currently well controlled. We always hesitate to fix something that isn't broken.
Please let me know if your need more help with this.