You are in Member Communities . This stuff is very interesting, and there is lots of information for the taking if you want to flesh out your paper. Let me give you a very short explanation. When substances enter the body, they can be eliminated unchanged through the kidneys, or they may need to be modified in the liver first. There are a variety of enzymes, and these are classified using a number for the general type, then a letter for the subtype, then another number for the specific type.
Some enzymes seem to be particularly important for the breakdown of certain medications.
These include 2D6, 3A4, 1A2, 2C19, and others. So, in your question you are refering in different ways to the 3A4 enzyme of the P-450 enzyme system in the liver. CYP3A4 is responsible for the breakdown of a variety of medications. Prozac tends to inhibit or slow the action of CYP3A4, as well as slowing the action of many P-450 enzymes fairly significantly. This means that the blood levels of drugs broken down by P-450 enzymes will tend to rise if someone takes Prozac.