Vicodin, Prozac or other opiates should never be taken without a prescription or in large quantities (an overdose) because they could have fatal side-effects.

Vicodin involves about 3 substances, acetaminophen, hydrocodone and fluoxetine, but out of these ones the most dangerous is acetaminophen. Overdosing Vicodin might result in fatal liver failure because of the acetaminophen, respiratory depression because of the hydrocodone or even respiratory arrest. These should be enough reasons to stick to the prescription your doctor gave you, and not take an overdose of Vicodin. Furthermore, for taking Prozac in large quantities (overdosing) you might get into a coma, so again carefully follow your prescription to avoid unwanted (or fatal) Vicodin/Prozac side-effects.