Pharmacokinetics.

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Presentation transcript:

Pharmacokinetics

Pharmacokinetics Pharmacokinetics refers to what the body does to a drug. Pharmacodynamics describes what the drug does to the body. Four pharmacokinetic properties determine the onset, intensity, and the duration of drug action Using knowledge of pharmacokinetic parameters, clinicians can design optimal drug regimens including: The route of administration The dose The frequency The duration of treatment.

Pharmacokinetics

Routes of drug administration

Routes of drug administration

Parenteral

Transdermal

Absorption Absorption is the transfer of a drug from the site of administration to the bloodstream. The rate and extent of absorption depend on The environment where the drug is absorbed The chemical characteristics of the drug, The route of administration (which influences bioavailability). Routes of administration other than intravenous may result in partial absorption and lower bioavailability.

Mechanisms of absorption of drugs from the GI tract

Mechanisms of absorption of drugs from the GI tract

Factors influencing absorption 1. Effect of pH on drug absorption:

PH and PKa

Factors influencing absorption 2. Blood flow to the absorption site: The intestines receive much more blood flow than the stomach, so absorption from the intestine is favored over the stomach. 3. Total surface area available for absorption: With a surface rich in brush borders containing microvilli, the intestine has a surface area about 1000-fold that of the stomach, making absorption of the drug across the intestine more efficient.

Factors influencing absorption 4. Contact time at the absorption surface: Sever diarrhea Food : Dilutes the drug. Slows gastric emptying.

5. Expression of P-glycoprotein: P-glycoprotein is a transmembrane transporter protein responsible for transporting various molecules, including drugs, across cell membranes. “pumps” drugs out of the cells. Thus, in areas of high expression, P-glycoprotein reduces drug absorption. In addition to transporting many drugs out of cells, it is also associated with multidrug resistance.