VPT 311: General and Systemic Veterinary Pharmacology (2+1)

ABSORPTION

• Absorption is the movement of drug from the site of administration to circulation.
• Often the entire quantity of administered drug does not reach the systemic circulation. Only the fraction of drug that was absorbed is available for action.
• During the process of absorption, the quantity of drug absorbed and also the rate of drug absorbed determine the drug action.
• In all routes of administration, except with intravenous administration,  the drugs have to cross the biological membranes for entering the systemic circulation and hence are governed by factors affecting passage of drugs across membranes.