Medicins

In most cases the drug works by binding to specific sites in the cell, called receptors. As the receptor distance from the place of the drug, it is important that the drug is transported from place to place application activity. The drug binds to the receptor, and the strength of binding may be different, which determines the duration of the effect of the drug. It is desirable that the drug reaches the desired site of action, ie it has a selective effect, thus reducing the possibility of complications due to additional side effects. One or more drugs can affect the human body, and this effect is called pharmacodynamics. The body affects the drug occur in the process of absorption, metabolism and excretion of the drug. These processes are described pharmacokinetics.

The drug can be:

     enteral - through the digestive tract, whether it is inserted through the mouth (oral), under the tongue (sublingual) or through the colon (rectum);
     Parenteral - means the method of administration that bypass the digestive tract, so that it enters directly into the appropriate tissue healing forms such as ampoules, infusion solutions, such as: injection (injection) into a vein (intravenously), into a muscle (intramuscularly) or under the skin (subcutaneously). Parenteral drugs are mainly used to make the passage through the digestive tract broken down (eg insulin) or when it wants to achieve a quick effect. This kind of application has the advantage, because the drug reaches the bloodstream unchanged, or to a specific place, and action is fast and completely.