What is an example of pharmacokinetics?
Digoxin, particularly when given intravenously, is an example of a drug that is well described by two- compartment pharmacokinetics. After an intravenous dose is administered, plasma concentrations rise and then rapidly decline as drug distributes out of plasma and into muscle tissue.
How does zero order kinetics affect drug half-life?
Half-life is dependent on exponential elimination kinetics Thus, in zero-order kinetics of elimination the concept of half-life becomes meaningless because the drug concentration does not decrease by half with every predictable time interval. Instead, we talk about drug dose removed over time.
What 4 types of drug effects on a body are studied in pharmacokinetics?
Think of pharmacokinetics as a drug’s journey through the body, during which it passes through four different phases: absorption, distribution, metabolism, and excretion (ADME). The four steps are: Absorption: Describes how the drug moves from the site of administration to the site of action.
What are 3 mechanisms of drug drug interactions?
The pharmacodynamic interactions of drug-on-drug can be divided into three broad groups: interference with drug effects on receptor function, interference with a physiological control process, and additive or opposing physiological effects. To elaborate on these is the objective of this chapter.
What is the best example of a drug that is eliminated by a zero order pharmacokinetic process?
A few substances are eliminated by zero-order elimination kinetics, because their elimination process is saturated. Examples are Ethanol, Phenytoin, Salicylates, Cisplatin, Fluoxetin, Omeprazol.
Which among the following reactions is an example of a zero order reaction *?
The decomposition of ammonia (NH3) on the surface of Pt is zero-order reaction.
What is free drug in pharmacokinetics?
Protein Binding In the body, a drug may be protein-bound or free. Only free drug can act at its pharmacologically active sites, e.g., receptors, cross into other fluid compartments, or be eliminated.
What is an example of drug synergism?
Drug synergism happens when the effects of two or more different kinds of drugs cancel each other’s effects. 4. The potency of aspirin and caffeine increases when combined, providing greater pain relief than when taken alone.
What are the four components of pharmacology?
The study of pharmacology encompasses the sources, chemical properties, biological effects and therapeutic uses of drugs.
What does AUC mean in PK?
area under the curve
The area under the plasma drug concentration-time curve (AUC) reflects the actual body exposure to drug after administration of a dose of the drug and is expressed in mg*h/L. This area under the curve is dependant on the rate of elimination of the drug from the body and the dose administered.