It depends: Results (and their speed) depend on the reasons you're being prescribed the Prozac (fluoxetine) to begin with. Going from 10 mg to 40 mg is a big jump, and as a physician i would be more gradual about it. Generally one needs several weeks to notice changes. Since you've shared no info about why you were prescribed prozac, (fluoxetine) i can't really comment further.
Answered 6/30/2014
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