hi. sadly, i don't think anyone can tell a person for sure, before treatment, what psych drugs will help, which will harm, or anything like that. even with the best psychiatrist around, a lot of it is guess work, largely guided by research that tends to be low quality and is often influenced by Big Pharma, one way or another.

having said that...prozac has a very long half life. when it hit the market, the standard dose was 20mgs. there is some indication that some people do well on lower doses of prozac.

there are, of course, non-antidepressant options for some people with bipolar I. mirapex is being used "off label". so are provigil and nuvigil. ritalin (and the newer one, focalin) can help provide energy and improve concentration, reduce fatigue, etc. now and then, amphetamines, such as adderall, dexedrine, etc., are used for people with depression, including some people with bipolar I.

i dont know of the research your psychiatrist is basing the recommendation on, but using a low dose of Prozac seems a prudent idea.

there are other, more "experimental" options...ketamine, opiates. ketamine has attracted a lot of interest lately, in particular.