Certification Medication Pharmacology & Mechanisms of Action Flashcards
9 cards from real MAP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 9 Certification Medication Pharmacology & Mechanisms of Action flashcards as text
What is the primary function of an agonist drug?
Answer: It activates the receptor to produce a response
An agonist drug functions by binding to a specific receptor site on a cell and activating it. This activation initiates a cellular response, mimicking the action of a naturally occurring substance. Essentially, agonists 'turn on' receptors to produce a desired physiological or therapeutic effect.
Which route of administration delivers medication directly into the bloodstream?
Answer: Intravenous
The intravenous (IV) route of administration delivers medication directly into the bloodstream by injecting it into a vein. This method allows for rapid onset of action and precise control over drug concentration, as it bypasses the digestive system and first-pass metabolism in the liver.
What does 'half-life' of a medication refer to?
Answer: Time for half of the drug to be eliminated
The 'half-life' of a medication refers to the time it takes for the concentration of the drug in the body to be reduced by 50%. This pharmacokinetic parameter is crucial for determining dosing intervals and understanding how long a drug's effects will last, as it reflects the rate of elimination from the body.
What is the mechanism of action of beta-blockers?
Answer: They block beta-adrenergic receptors
Beta-blockers work by blocking beta-adrenergic receptors, which are typically activated by adrenaline and noradrenaline. By blocking these receptors, beta-blockers reduce heart rate, contractility, and blood pressure, making them effective for conditions like hypertension, angina, and arrhythmias.
Which type of medication interaction occurs when two drugs enhance each other's effects?
Answer: Synergistic
A synergistic medication interaction occurs when two or more drugs taken together produce a combined effect that is greater than the sum of their individual effects. This means the drugs enhance each other's actions, leading to a significantly amplified therapeutic or adverse outcome.
Which organ is primarily responsible for drug metabolism?
Answer: Liver
The liver is the primary organ responsible for drug metabolism, a process that converts medications into more water-soluble compounds for easier excretion from the body. Enzymes in the liver, particularly the cytochrome P450 system, play a crucial role in breaking down drugs, significantly affecting their duration and intensity of action.
What is the function of an antagonist drug?
Answer: Blocks receptor activation
An antagonist drug functions by binding to a receptor site but does not activate it. Instead, it blocks other molecules, such as agonists or natural ligands, from binding and initiating a response. By blocking the receptor, antagonists effectively 'turn off' or reduce the activity that would normally occur at that site.
Which term describes the maximum effect a drug can produce?
Answer: Efficacy
Efficacy refers to the maximum therapeutic effect a drug can produce, regardless of the dose administered. It represents the drug's inherent ability to elicit a desired clinical response. A drug with high efficacy can produce a strong effect, while a drug with low efficacy may only produce a weak effect, even at high doses.
Why are some drugs administered sublingually?
Answer: To bypass the digestive system for rapid effect
Some drugs are administered sublingually to bypass the digestive system and achieve a rapid effect. When placed under the tongue, the medication dissolves and is absorbed directly into the bloodstream through the rich capillary network, avoiding first-pass metabolism in the liver and leading to quicker onset of action.