I was on both meds for nearly 2yrs. I never experienced adverse reactions to the combo. That being said tho, I was on much lower dosages than you. 1mg Risperdal, split into 2 doses to decrease sedation, and 20mg Prozac. (40mg during depressive episodes).
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The Risperdal was added whilst inpatient, so I'm sure they did their homework. I do believe however that the dosages could possibly affect interaction, and that's might be why some professionals advise against the combo.