SAS 7 Flashcards
A reaction between two or more drugs or between a drug and a food beverage or supplement
Drug interaction
It is the modification of the therapeutic effect of one drug by the prior concominant administration of another
Therapeutic incompatibility
Any noxious or unintended reaction to a drug that is administered in standard doses by the proper route for the purpose of prophylaxis, diagnosis or treatment
ADR Adverse Drug Reactions
An action of a drug on the effectiveness or toxicity of another drug
Drug interaction - a.k.a drug-adjuvant interaction
Precipitant drug
Responsible
Object drug
Affected
Occurs when one drug enhances or interferes with the absorption, distribution, metabolism or excretion of another drug resulting in a change in drug concentration in the body or the duration of the drug’s availability at the receptor sites
Pharmacokinetic interactions (ADME)
When a precipitant drug affects the absorption of an object drug, the concentration of the drug in the plasma is either increased or decreased
Alteration in absorption
Absorption of some drugs from GIT is dependent on the pH of the fluid in absorption site
Alreration in the Gastric pH
Ketoconazole+Antacid
Alteration in Gastric pH
Bisacodyl+Antacid
Alteration in Gastric pH
Some drugs may form irreversible chelates in the presence of another drug rendering both drugs inactive
Complexation
Tetracycline + Metals
Complexation
Fluoroquinolones + Metals
Complexation
Penicillamine + Metal-containing drugs
Complexation
Non-specific binding of a drug to another agent
Adsorption
Cholestyramime + warfarin = thrombosis
Adsorption
the time it takes for the stomach to empty it’s content
Gastric Empting Time