And again, the medication was misprescribed — double the recommended dose. This is not the fault of Prozac or its manufacturer — Prozac and other SSRIs help millions of people. This is an all around tragedy for which a very screwed up person and secondarily, probably an irresponsible doctor are responsible.
Addressing the first part - do you know that Eli Lilly just settled a class action for over a billion dollars, pleading guilty to illegal marketing for improper use of their most lucrative psychotropic? Eli Lilly has quite a colorful history when it comes to publishing only good trials, downplaying side effects and withdrawal, and settling out of court.
The second part - how do you know? Actually studies show that SSRIs/SNRIS perform no better than placebos. Meanwhile, the side effects (and withdrawal, for many other SSRIs and SNRIs - Prozac happens to be one of the lesser offenders due to its longer half-life) are often worse than the benefits.
According to the FDA, "Anxiety, agitation, panic attacks, insomnia, irritability, hostility, impulsivity, akathisia (severe restlessness), hypomania, and mania have been reported in adult and pediatric patients being treated with antidepressants for major depressive disorder as well as for other indications, both psychiatric and nonpsychiatric." I guess the volume of reports warranted their attention, because they've issued multiple advisories in recent years.
And do an internet search for "discontinuation syndrome" - that's what the pharmaceutical companies like to call what the rest of the world would understand as withdrawal. It can be downright horrific.