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chapter 2
ch 2 flashcards
| Term | Definition |
|---|---|
| low does-effect curve | Measuring the response to the dose of the drug |
| potency | The amount of drug required to produce an effect |
| efficacy | related to the maximal effect of a drug regardless of dose: is the maximum intensity of effect or response that can be produced by a drug |
| therapeutic action/effect | the intended or desired results |
| therapeutic range | range between the dose causing the minimum effect and the dose causing the minimum adverse effect. |
| therapeutic index (TI) | number that determines the safety of a drug. (the greater the TI, the safer the drug) |
| prophylactic | refers to measures or treatments designed to prevent disease or a condition before it occurs |
| receptors | is a protein in or on a cell that a drug or natural substance binds to in order to cause a specific effect in the body. |
| agonist | is a drug that has an affinity for a receptor, combines with a receptor and produces an effect. |
| antagonist | Is a drug that binds to a receptor but does not activate it; instead, it blocks or reduces the effect of other substances. Counteracts the action of the agonist. |
| renal | kidney |
| hepatic | liver |
| biotransformation | is the body’s way of changing a drug so that it can be more easily excreted by the kidneys. |
| tolerance | the need for an increasingly larger dose of the drug to obtain the same effects as the original dose |
| duration | is the length of a drug’s effect |
| half life | the half-life of a drug is the amount of time that passes for its concentration to fall to half (50%) of its original blood level. |
| median effect dose (ED50) | is the dose required to produce a desired clinical effect in 50% of test subjects. A low effective dose is preferred because it means less drug is needed to achieve the desired therapeutic effect. |
| lethal dose (LD50) | is the amount of a substance that causes death in 50% of a test population. A lower LD means the substance is more toxic. |
| enteral | Drugs are placed directly into the GI tract by oral or rectal administration |
| parental | Administered or occurring elsewhere in the body other than the mouth and alimentary canal. |
| absorption | Is the process by which drug molecules are transferred from the site of administration to the circulating blood. |
| metabolism | is the body’s way of changing a drug so that it can be more easily excreted by the kidneys. |
| distribution | The passage of drugs into various body fluid compartments such as plasma, interstitial fluids and intracellular fluids. |
| excretion | The elimination of a drug and its metabolites from the body |
| first pass effect | The first-pass effect occurs when a drug is partially broken down by the liver before it reaches the bloodstream, reducing the amount of drug available to produce its effect. |