ABSTRACT
The routes for the administration of substances include intravenous (i.v.), intraperitoneal (i.p.), intramuscular (i.m.), subcutaneous (s.c.), intragastric (i.g.), inhalatory, and through drinking of water. These routes allow the administration of exact amounts of substances in solution or suspension. The inhalatory route is the exception, and it is useful in the case of gaseous and volatile substances (anesthetics, hydrogen, oxygen, etc.).
