While tapering prozac, (fluoxetine) is it best to go from 20 to 15mg, then 10 and 5 and stop.or going directly to 10mg and then zero after a few weeks.?

Gradual is best: Gradual tapering is best, but this should be done under the supervision of a physician....Preferably a psychiatrist.

Tapering Prozac (fluoxetine).: Please do not stop your antidepressant without checking with the prescribing physician. Many conditions Prozac (fluoxetine) is used to treat tend to recur, especially if the medication i'd stopped too quickly. While it is often helpful to taper antidepressants, for Prozac (fluoxetine) this is not always necessary as it takes a week for half of Prozac (fluoxetine) and its metabolites to clear from your system and a month to fully clear.