What is Pharmacology

Pharmacology is the study of drugs and their origins, chemical structures, administration, action metabolism and excretion. Pharmacology has changed. Originally a scientific discipline that described the effects of biologically active chemicals, pharmacology now explores the molecular mechanisms of which drugs cause bio reactions. In the broadest sense, pharmacology is the study of how chemical agents, both natural and synthetic (i.e., drugs) affect biological systems.

Drugs may be given to the patient by injection, orally, rectally, inhalation and applied topically. The term bioavailability devotes the proportion of drugs, which reaches the circulation. If swallowed only a portion will be circulated. Absorption will depend on the physical properties of the drug. Absorption will depended on the physical properties of the drug. Absorption will depend on the physical properties of the drug. Absorption will depend on the physical properties of the drugs, which reached the circulation.

It drugs are given intravenously the bioavailability is 100%. If swallowed only a portion will be circulated. Absorption maybe modified by the rate at which the stomach empties the presence or absence of food or disease of the gastro-intestinal tract. After absorption, drugs enter the blood stream and are carried around the body. Drugs are metabolized products, which may be excreted through the kidneys, and if they have any disease or if they are damaged excretion may be delayed.