2. When we do administration of drug by any route like oral or injection, the drug will be absorbed from the site of administration to the blood
(systemic circulation).
3. The blood will distribute the drug in all the body.
4. Each drug has a target organ. The drug will give the therapeutic effect on the target organ (this is pharmacodynamics NOT pharmacokinetics).
5. The body will deal with the drug as a foreign material, and wants to eliminate it by two steps:
A. drug biotransformation (metabolism).
B. Drug excretion.