Pharmacology Quiz for Medical Students

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Questions and Answers

Which drug is an example of a direct acting cholinergic agonist?

  • Pilocarpine (correct)
  • Phenoxybenzamine
  • Neostigmine
  • Epinephrine

Salbutamol stimulates alpha adrenergic receptors.

False (B)

What is the median toxic dose (TD50) of a drug?

The dose at which toxicity occurs in 50% of cases.

Carvedilol and Labetalol are examples of ______ blockers.

<p>beta</p> Signup and view all the answers

What is a significant issue with geriatric patients regarding drug metabolism?

<p>Increased phase 2 metabolism leading to more adverse effects (C)</p> Signup and view all the answers

Match the following drugs with their actions:

<p>Epinephrine = Stimulates SNS Atropine = Inhibits PNS Phenylephrine = Stimulates alpha receptors Salbutamol = Stimulates beta receptors</p> Signup and view all the answers

LD50 stands for the amount needed to cure 50% of test subjects.

<p>False (B)</p> Signup and view all the answers

Which type of metabolism is primarily involved in drug elimination through the kidneys?

<p>Renal metabolism</p> Signup and view all the answers

Which of the following best describes an agonist?

<p>A molecule that binds and activates a receptor (A)</p> Signup and view all the answers

Mixed action agonists only activate receptors without any blocking effect.

<p>False (B)</p> Signup and view all the answers

Name one primary function of alpha receptor agonists.

<p>Vasoconstriction</p> Signup and view all the answers

_________ are substances that block the action of acetylcholine in the parasympathetic nervous system.

<p>Anticholinergics</p> Signup and view all the answers

Match each receptor type with its primary action:

<p>Alpha receptors = Vasoconstriction Beta-1 receptors = Increased heart rate Beta-2 receptors = Bronchodilation Muscarinic receptors = Increased gland secretion</p> Signup and view all the answers

What is a characteristic feature of partial agonists?

<p>They activate receptors but with less efficacy than full agonists. (B)</p> Signup and view all the answers

Cholinergic agonists enhance the effects of acetylcholine in the nervous system.

<p>True (A)</p> Signup and view all the answers

Identify one example of a beta receptor antagonist.

<p>Propranolol</p> Signup and view all the answers

Direct acting agonists primarily act by binding to a ________, while mixed acting agonists can act through both receptor binding and neurotransmitter release.

<p>receptor</p> Signup and view all the answers

What effect do beta-2 receptor agonists typically have in the body?

<p>Bronchodilation (A)</p> Signup and view all the answers

What is the mechanism of action of Prazosin?

<p>Blocks α1 receptors (A)</p> Signup and view all the answers

Clonidine is an α1 agonist used to treat hypertension.

<p>False (B)</p> Signup and view all the answers

Name a contraindication for using Dopamine as a treatment.

<p>Pheochromocytoma</p> Signup and view all the answers

Epinephrine acts on _____ receptors to cause vasoconstriction.

<p>α1</p> Signup and view all the answers

Match the following receptors with their primary effects:

<p>α1 = Vasoconstriction β2 = Bronchodilation β1 = Increased heart rate α2 = Inhibition of norepinephrine release</p> Signup and view all the answers

Which of the following direct acting agonists is indicated for anaphylaxis?

<p>Epinephrine (B)</p> Signup and view all the answers

Salbutamol is a selective β2 agonist used in the treatment of asthma.

<p>True (A)</p> Signup and view all the answers

Identify one side effect of Alpha-1 receptor agonists.

<p>Hypertension</p> Signup and view all the answers

The action of Methyldopa is primarily on the _____ to lower blood pressure.

<p>CNS</p> Signup and view all the answers

Match the following agents with their action:

<p>Dobutamine = Increased heart contractility Mirabegron = Stimulates bladder relaxation Propranolol = Decreased heart rate Phenylephrine = Vasoconstriction</p> Signup and view all the answers

Which of the following is a mixed action agonist?

<p>Ephedrine (D)</p> Signup and view all the answers

Timolol is a selective β1 blocker.

<p>False (B)</p> Signup and view all the answers

What is the main use of β2 agonists in clinical practice?

<p>Bronchodilation</p> Signup and view all the answers

_____ acts as a partial agonist at β receptors, potentially causing trigeminal electrical excitability.

<p>Propranolol</p> Signup and view all the answers

Flashcards

Lethal Dose 50 (LD50)

The dose of a drug that kills 50% of the test subjects.

Alpha1 receptors

Located in blood vessels, causing vasoconstriction and increased vascular resistance.

Alpha2 receptors

Located in the CNS and other areas, they inhibit neurotransmitter release.

Beta1 receptors

Located mainly in the heart, increasing heart rate and contractility.

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Beta2 receptors

Located in the lungs, causing bronchodilation and lung relaxation.

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Epinephrine (adrenaline)

A non-selective adrenergic agonist, affecting both alpha and beta receptors.

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Norepinephrine

An adrenergic agonist that stimulates mainly alpha and beta-1 receptors.

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Dopamine receptors

Receptors that can cause either vasoconstriction or vasodilation, depending on dose and location.

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M1 receptors

Located in the stomach, causing increased stomach acid secretion.

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M2 receptors

Located in the heart, slowing heart rate and decreasing contractility

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M3 receptors

Located in smooth muscle (eyes, lungs, GI, bladder), causing contraction and secretion.

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Bethanechol

A direct-acting cholinergic agonist that stimulates muscarinic receptors.

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Physostigmine

An indirect-acting cholinergic agonist, and an inhibitor of acetylcholinesterase (AChE).

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Propranolol

A first-generation beta-blocker that may cause bronchoconstriction.

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Clonidine

An alpha-2 agonist that lowers blood pressure.

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Agonist

A molecule that binds to and activates a receptor.

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Zero order elimination

Constant rate of elimination of a drug (same amount lost over time).

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Pharmacokinetics

The study of how a drug is absorbed, distributed, metabolized, and eliminated from the body.

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Direct acting agonists

Drugs that directly bind and activate a receptor.

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Mixed action agonists

Drugs that act as both agonists and antagonists.

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Partial agonist

A drug that activates a receptor with less efficacy than a full agonist.

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Cholinergic agonists

Drugs that stimulate the action of the parasympathetic nervous system.

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Anticholinergic

Drugs that block the action of the parasympathetic nervous system.

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Therapeutic Index (TI)

The ratio of the toxic dose to the therapeutic dose of a drug. A larger TI indicates a wider margin of safety, meaning a higher dose is needed to cause toxicity.

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Synergy

When two drugs work together to produce a greater effect than either drug alone. This effect can be additive (combined effects) or synergistic (greater than combined effects).

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Median Toxic Dose (TD50)

The dose of a drug that causes toxicity in 50% of test subjects. It helps assess a drug's safety and potential for side effects.

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Pre-systemic Metabolism

The breakdown of a drug that occurs before it reaches systemic circulation. This can reduce the amount of drug that reaches its target and affect its effectiveness.

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Phase 1 Metabolism

The first stage of drug metabolism, where the drug molecule is modified by oxidation, reduction, or hydrolysis.

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Phase 2 Metabolism

The second stage of drug metabolism, where the drug molecule is conjugated (linked) with other molecules, making it more water-soluble for excretion.

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Half-Life

The time it takes for the concentration of a drug in the body to reduce by half. It's important for determining dosing intervals.

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Elimination

The process by which a drug is removed from the body.

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Study Notes

Compendium Pharmacologia

  • This is a pharmacology compendium, likely a study guide or textbook.
  • Tables created by Max Lemke and Ada Ohlsen
  • The content covers various topics in pharmacology.

Table of Contents

  • The table of contents lists several pharmacology colloquia (likely lectures or seminars) and their corresponding page numbers.
  • Topics include drug definitions, direct-acting agonists, mixed action agonists, receptors (alpha, beta, cholinergic), specific diseases (e.g., hypertension, diabetes, pain), and various drug classes (e.g., analgesics, antidepressants, antipsychotics, antifungals, antivirals, antibiotics, etc.).

Pharmacology Colloquium 1

  • Definitions:

    • Describes pharmacokinetics (body's reaction to drugs).
    • Describes pharmacodynamics (drugs' effects on the body).
    • Explains first pass effect (pre-systemic metabolism of a drug).
    • Explains metabolism (how drugs are converted to metabolites).
    • Discusses phase 1 and 2 metabolism (oxidation, reduction, hydrolysis, conjugation).
  • Zero order elimination: Constant rate of elimination (same amount being lost over time).

  • First order elimination: Rate of elimination proportional to amount (same percentage being lost over time).

  • Therapeutic Index: Ratio of the toxic dose to the therapeutic dose.

  • Agonist: A molecule that binds to a target and activates it.

  • Antagonist: A molecule that binds to a target and prevents activation.

  • Competitive vs. Non-competitive Antagonist: Competitive are reversible, Non-competitive are irreversible.

Pharmacology Colloquium 2

  • Diuretics: Covers different types like Carbonic Anhydrase inhibitors, loop diuretics, thiazides, and potassium-sparing diuretics, their MOA, SE, and indications (e.g., hypertension, heart failure).
  • Ca2+ channel blockers: Detailed discussion on mechanism, side effects, indications (e.g., hypertension, angina).
  • RAAS inhibitors: Mechanism, side effects, and indications (e.g., hypertension)

Pharmacology Colloquium 3

  • Analgesic Pain Ladder: Steps to manage pain, starting with non-opioids (NSAIDs) and progressing to stronger opioids if needed for severe pain.

Pharmacology Colloquium 4

  • Lists different anti-seizure drugs, their mechanisms of action, side effects, and indications.

Pharmacology Colloquium 5

  • Antifungals: Explores different classes and their mechanism of action, side effects, and indications.
  • Antivirals: Explores different classes and their mechanism of action, side effects, and indications, including HIV and Hepatitis.
  • Antibiotics: Covers various drug classes of antibiotics, their MOA, SE, and clinical contexts.

Additional Topics

  • Direct-Acting Agonists: Specifics on agents like Epinephrine, Norepinephrine, and Dopamine, focusing on their mechanisms, side effects, and clinical uses.

  • Mixed Action Agonists: Similar to direct-acting, but includes drugs that both activate receptors and cause release of stored neurotransmitters.

  • Alpha Receptors, Beta Receptors: Detail on specific alpha and beta receptors and their associated drugs.

  • Cholinergic Agonists and Antagonists: Specifics on cholinergic receptors and the effects of agonist and antagonists

  • Antihistamines: Details on H1 and H2 receptor blockers.

  • Glucocorticoids and Mineralocorticoids: Details on these steroid hormones and their therapeutic uses.

  • Anti-peptic ulcer agents: Describes different types of peptic ulcer agents, their MOA, SE and clinical uses.

  • Laxatives: Specifics on different categories and their mechanisms.

  • Anti-diarrheal Agents: Details on different drugs, their MOA, SE and clinical uses.

  • Gastric Diseases: General info on conditions related to the gastrointestinal tract.

  • Additional details from the 11-28 pages cover topics linked to specific diseases, agents, and their mechanisms/uses.

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