Pharmacokinetics is the study of what happens to drugs (pharmaceuticals) once they enter the body. This can be thought of as what the body does to the drugs. The main pharmacokinetic stages include:
- The absorption of the drug into the blood and across cell membranes to enter the cells;
- The distribution of the drug throughout the body;
- The metabolism or breakdown of the drug; and
- The irreversible excretion of the drug from the body.
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