Ptolemy-An ancient Greek astronomer and mathematician, Ptolemy's geocentric views on the structure of the universe dominated astronomy until the Scientific Revolution. Santorio Santorio-Santorio (1561-1636) was one of the first to apply the evolving physical philosophy of the Scientific Revolution to animal biology.
2 doctors agreed: A while: Since you took prozac/fluoxetine for only 4 days, it should leave your system in about 1 - 2 weeks completely. In general, if someone has been taking Prozac for a while (longer than two weeks), it can take up to 5 weeks to completely wash it out of ones system.
Prozac has an official 'approximate' half life of between 48 and 72 hours (why the huge difference beats me!) Taking a middle line of say 60 hours seems to be the easiest thing for calculation. Half life is how long it takes HALF of whats in your body to leave.