Thermodynamics in Drug Discovery Quiz

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Questions and Answers

Under what conditions does a reaction occur spontaneously?

  • When the change in enthalpy (ΔH) is negative and the change in entropy (ΔS) is positive.
  • When the change in Gibbs free energy (ΔG) is positive.
  • When the change in Gibbs free energy (ΔG) is negative. (correct)
  • When the change in enthalpy (ΔH) is positive and the change in entropy (ΔS) is negative.

Which of the following is NOT a thermodynamic concept that can be used to interpret the properties of a new drug?

  • Melting point
  • Pharmacokinetics (correct)
  • Partitioning
  • Solubility

What is the relationship between entropy and spontaneity in a reaction?

  • A positive change in entropy always leads to a spontaneous reaction.
  • A negative change in entropy always leads to a non-spontaneous reaction.
  • A positive change in entropy favors a spontaneous reaction, but it is not the sole determining factor. (correct)
  • Entropy plays no role in the spontaneity of a reaction.

The Gibbs equation, ΔG = ΔH - TΔS, describes the relationship between which thermodynamic quantities?

<p>Gibbs free energy, enthalpy, and entropy (D)</p> Signup and view all the answers

Which of these statements describes the concept of entropy correctly?

<p>Entropy is a measure of the disorder or randomness of a system. (A)</p> Signup and view all the answers

What is the relationship between drug-receptor interactions and thermodynamics?

<p>Thermodynamics helps predict the strength and stability of drug-receptor interactions. (C)</p> Signup and view all the answers

Why is absolute zero considered a significant reference point in thermodynamics?

<p>It is the temperature at which all molecular motion ceases. (C)</p> Signup and view all the answers

In the context of drug discovery, how is the concept of thermodynamics applied?

<p>It is used to design drugs that have specific interactions with target molecules, such as receptors. (D)</p> Signup and view all the answers

Which of the following scenarios BEST describes a spontaneous process?

<p>Ice melting at room temperature. (B)</p> Signup and view all the answers

Which drug was recognized as a top-selling pharmaceutical product for 9 consecutive years before COVID-19?

<p>Humira (C)</p> Signup and view all the answers

What was the annual sales figure for Comirnaty in 2022?

<p>$37.8 billion (A)</p> Signup and view all the answers

Which company produces the drug Keytruda?

<p>Merck &amp; Co. (A)</p> Signup and view all the answers

What condition does Humira primarily treat?

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

What was the sales range for Comirnaty in 2023?

<p>$11.2 - $15.3 billion (B)</p> Signup and view all the answers

What factor caused 8 drugs to lose their blockbuster status?

<p>Going generic or competition (D)</p> Signup and view all the answers

What was notable about how Comirnaty performed against its competitor in sales?

<p>It had more than double the sales of its main competitor, Moderna. (C)</p> Signup and view all the answers

Which type of cancer does Keytruda primarily target?

<p>Non-small cell lung cancer (A)</p> Signup and view all the answers

What is the main purpose of water-soluble lubricants in effervescent tablets?

<p>To assist in the rapid dispersion and dissolution of the tablet (C)</p> Signup and view all the answers

Which of the following types of capsules is primarily used for oily ingredients?

<p>Soft-shelled capsules (B)</p> Signup and view all the answers

What is a characteristic feature of effervescent granules when added to water?

<p>They produce a fizzing action (B)</p> Signup and view all the answers

What is a potential benefit of fast-dissolving oral delivery formulations?

<p>Potentially increased bioavailability (C)</p> Signup and view all the answers

Which of the following statements is true regarding oral emulsions?

<p>They are stabilized oil-in-water dispersions (B)</p> Signup and view all the answers

What is a common packaging requirement for very porous tablets?

<p>Specialized ‘peel-off blister’ packaging (A)</p> Signup and view all the answers

What is a key advantage of hard gelatin capsules?

<p>They mask the unpleasant taste of their contents (B)</p> Signup and view all the answers

What role does citric acid play in effervescent tablets?

<p>Reacting with bicarbonates to create effervescence (B)</p> Signup and view all the answers

Which of the following factors is NOT directly related to the pre-formulation stage of a solid dosage form?

<p>Liver anatomy and function (A)</p> Signup and view all the answers

What is the primary purpose of studying the 'GI structure, motility, digestion, & absorption' in the context of drug delivery?

<p>To identify the optimal route of administration for a specific drug. (D)</p> Signup and view all the answers

Why are 'brands and generics' considered in the study of drug delivery?

<p>They influence the bioavailability and therapeutic efficacy of the drug. (B)</p> Signup and view all the answers

Which of the following BEST illustrates the concept of 'optimizing drug properties to ensure good oral bioavailability'?

<p>Adding excipients to enhance the drug's stability and improve its dissolution rate. (D)</p> Signup and view all the answers

In the context of drug delivery, what does the term 'extravascular administration' refer to?

<p>Administration of a drug through any route other than direct injection into a vein. (D)</p> Signup and view all the answers

What is the primary objective of studying 'ADME and pharmacokinetics' in the context of drug delivery?

<p>To understand how the drug is absorbed, distributed, metabolized, and eliminated by the body. (A)</p> Signup and view all the answers

Which aspect of drug delivery is LEAST impacted by the 'physicochemical properties of molecules'?

<p>Patient compliance and adherence to the prescribed dosage regimen. (C)</p> Signup and view all the answers

Considering the role of excipients in solid dosage forms, which of the following is NOT a direct function of an excipient?

<p>Modifying the drug's absorption rate in the gastrointestinal tract. (B)</p> Signup and view all the answers

Which of the following factors contributed to the rise of generic drugs in the 1990s and 2000s?

<p>A growing elderly population globally (A)</p> Signup and view all the answers

Based on the information provided, what is a likely consequence of generic drug companies launching copycat versions of a leading brand?

<p>A significant decrease in the overall cost of healthcare (D)</p> Signup and view all the answers

What is one reason why pharmaceutical companies have implemented lifecycle management strategies?

<p>To extend patent protection and maintain a competitive advantage in the market (B)</p> Signup and view all the answers

Which of the following represents a common misconception regarding generic drugs?

<p>They are always less effective than branded drugs (A)</p> Signup and view all the answers

What is a major challenge faced by pharmaceutical companies like Pfizer in the current market?

<p>Competition from generic drug manufacturers (A)</p> Signup and view all the answers

Which of the following accurately describes the relationship between pharmaceutical companies and generic drug manufacturers?

<p>Direct competitors vying for market share (C)</p> Signup and view all the answers

What is a key characteristic of a generic drug that distinguishes it from the original branded drug?

<p>A different brand name and marketing strategy (D)</p> Signup and view all the answers

Based on the information provided, which disease state is most likely to benefit from the availability of generic drugs?

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

Which of these statements accurately reflects the potential cost savings associated with generic medicines compared to branded counterparts?

<p>Generic medicines can potentially save up to 80% of the cost of branded medicines. (A)</p> Signup and view all the answers

In which specific disease area is it essential to exercise caution when switching from a branded medicine to a generic equivalent, due to the potential for variability in absorption rates?

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

What is the primary reason why prescribers are encouraged to prescribe medicines using their generic names?

<p>To allow pharmacists greater flexibility in choosing the product to dispense. (D)</p> Signup and view all the answers

What is the primary factor contributing to the cost savings associated with generic medicines?

<p>Lower research and development costs for generic companies. (A)</p> Signup and view all the answers

Which of the following is a valid reason why a patient might need to remain on a branded medicine instead of switching to a generic equivalent?

<p>All of the above. (D)</p> Signup and view all the answers

Which type of medication is the most likely to have a biosimilar substitute available?

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

In the context of generic medicines, what is the meaning of 'bioequivalence'?

<p>The generic medicine is absorbed and metabolized in the body in the same way as the branded medicine. (D)</p> Signup and view all the answers

How does the growth of generic medicines in the UK impact healthcare costs?

<p>It reduces healthcare costs by providing cheaper alternatives to branded medicines. (B)</p> Signup and view all the answers

Flashcards

Pharmacokinetics

The study of how drugs move through the body, including absorption, distribution, metabolism, and excretion.

Drug Absorption

The process by which a drug enters the bloodstream from its administration site.

Drug Distribution

The way a drug is distributed throughout the body.

Drug Metabolism

The breakdown of a drug in the body, often by the liver.

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Drug Excretion

The process of removing a drug and its metabolites from the body, mainly by the kidneys.

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Physicochemical Properties of Drugs

The physical and chemical properties of a drug, such as its size, shape, and solubility, which influence its absorption, distribution, metabolism, and excretion.

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Dosage Forms

The form in which a drug is administered, such as tablets, capsules, or injections.

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Dissolution Rate

The rate at which a drug dissolves in solution, affecting how quickly it is absorbed.

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Blockbuster Drugs

Drugs that reach annual sales of over $1 billion, often due to high demand, strong efficacy, or market exclusivity.

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Losing Blockbuster Status

When a drug loses its blockbuster status due to reasons like patent expiry (generics), competition, or reduced pricing power.

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Humira

The highest-selling drug for nine consecutive years before Comirnaty's rise, known for its treatment of various inflammatory conditions.

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Comirnaty

Pfizer and BioNTech's COVID-19 vaccine, the first to reach blockbuster status in 2021, setting a new record in pharmaceutical sales.

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Transition to Endemic Stage

The transition from a global pandemic to a more manageable endemic stage, leading to a decrease in demand for pandemic-related drugs and therapies.

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Genericization

The process of a drug becoming available in a generic form, often resulting in lower prices.

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Losing Pricing Power

The act of losing pricing power, usually due to market forces like increased competition or reduced demand.

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Competition in the Pharma Market

The introduction of a competitor (drug) entering the market, often leading to a decline in the original drug's sales.

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Generic Drug Companies

Pharmaceutical companies that produce and sell drugs that no longer have patent protection.

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Generic Business

The process where a leading brand loses patent protection for its drug, allowing other companies to produce and sell copies.

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Generic Drug

A drug that is bioequivalent to a leading brand drug, meaning it has the same pharmacokinetic and pharmacodynamic properties.

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Lifecycle Management

Strategies employed by pharmaceutical companies to extend the patent life of their drugs, delaying the entry of generic versions.

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The Era of Generics

The increased use of generic drugs due to factors such as aging populations, rising healthcare costs, and government initiatives to promote cost-effectiveness.

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Generic Medicines

Drugs that are chemically identical to the original brand drug in terms of dosage, administration route, safety, and efficacy.

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Generic Names

The use of generic names to identify medications, typically based on the chemical name.

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Increased Acceptance of Generic Drugs

The growing acceptance of generic drugs by healthcare professionals and patients, driven by factors such as cost savings and similar effectiveness compared to brand-name drugs.

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Generic Prescribing

Prescribing a medicine using its generic name rather than its brand name.

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Generic Penetration

The percentage of generic medicines used in a region, indicating how much cost savings are being realized.

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What are effervescent tablets?

Uncoated tablets that react with water to release carbon dioxide, resulting in fizzing. They are designed to dissolve quickly and create a pleasant, carbonated drink.

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What are capsules?

A dosage form where the medication is enclosed in a gelatin or Hydroxypropyl methylcellulose shell. They are used to mask unpleasant tastes and can contain dry powders or liquids.

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What are oral granules?

Solid, dry particles of medication that are often packaged in sachets. Some are dissolved in water before taking, while others are placed on the tongue and swallowed with water.

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What are fast dissolving oral delivery formulations?

Solid dosage forms that dissolve or disintegrate rapidly in the mouth, without requiring water. These tablets often have a porous structure to facilitate rapid dissolution.

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What are oral solutions?

Clear liquid preparations for oral use containing one or more active ingredients dissolved in a solvent. Common solvents include diluted alcohol, glycerin, propylene glycol, and purified water.

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What are oral emulsions?

Stabilized oil-in-water dispersions for oral use. Both the oil and water phases can contain dissolved solids.

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What is drug absorption?

The process by which a drug enters the bloodstream from its administration site.

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What is drug distribution?

The way a drug is distributed throughout the body, reaching different tissues and organs.

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Absolute Zero

The temperature at which all molecular motion stops, equivalent to -273.15 degrees Celsius.

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Entropy (S)

A measure of the disorder or randomness in a system. The more disordered a system is, the higher its entropy.

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Free Energy (G)

The energy that is available to do work. It's a combination of enthalpy (heat) and entropy (disorder).

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Spontaneous Reaction

A reaction that can occur on its own, without requiring external energy input.

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Non-Spontaneous Reaction

A reaction that requires energy input to occur, and doesn't happen on its own.

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Enthalpy (H)

The amount of energy released or absorbed during a reaction.

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Gibbs Equation: G = H - TS

A key equation in thermodynamics that relates free energy change to enthalpy change, entropy change, and temperature.

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Solubility

The maximum concentration of a drug that can dissolve in a given solvent.

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Melting Point

The temperature at which a substance transitions from a solid (crystalline) state to a liquid.

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Partitioning

The distribution of a drug between two immiscible liquids, often oil and water, representing how it crosses cell membranes.

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Study Notes

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