Drug Absorption and Distribution Practice Test

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• Where are drugs mainly absorbed when taken orally?
• What is an expected consequence of enterohepatic circulation on pharmacokinetic parameters?
• How could protein binding lead to drug reactions?
• How does gastric pH influence absorption of weak acids versus weak bases?
• Transdermal formulations are useful when only a small volume of drug is required to achieve an effect. Which of the following is a typical example?
• Which plasma protein largely determines binding of many acidic drugs, and what is a consequence of displacement?
• Most drugs are eliminated primarily by which organ, with some excretion via feces?
• Which statement is true about physiological factors that can alter Vd?
• What is paracellular transport?
• What are common metrics used to describe absorption after oral dosing?
• Describe how distribution phase after IV bolus influences the onset of drug effect.
• Biotransformation is defined as:
• Through a cell membrane, a drug diffuses best when it is in which state?
• A weak base like propranolol will be absorbed more in which environment?
• What kind of molecules would be able to move through paracellular transport and what does paracellular transport impact in drugs?
• A weak acid like aspirin is more likely to be absorbed in which environment?
• How is the volume of distribution typically determined?
• For anesthetic drugs, a high partition coefficient indicates what about membrane partitioning and potency?
• What can affect GI absorption that is not related to drug properties or the integrity of the GI tract?
• How can you calculate bioavailability?
• What are some cons of giving a drug IV?
• For a weak base, at higher pH, which form is likely?
• Which statement describes transport that moves substances from high concentration to low concentration without energy input?
• Which description best characterizes a substance with a high volume of distribution (Vd)?
• What is meant by a drug's volume of distribution (Vd)?
• Which antibiotic's absorption is known to be reduced by dairy products?
• Which of the following is not a primary determinant of a drug's volume of distribution (Vd)?
• What is the effect of enzyme inducers or inhibitors on apparent oral bioavailability of drugs with high first-pass metabolism?
• In a two-compartment model, which phrase best describes the distribution phases?
• Which statement about Cmax is true?
• Which parameter is used to quantify bioavailability?
• Which statement about high Vd and half-life is true?
• Which statement about absorption is true?
• Which of the following lists the four main mechanisms by which drugs pass through cells and barriers?
• How do drugs cross a cell membrane in carrier-mediated transport?
• How can formulation strategies influence absorption and distribution (e.g., salt forms, prodrugs)?
• What does a high volume of distribution indicate about a drug's distribution?
• Large protein-based drugs such as insulin are absorbed into the bloodstream primarily via which route?
• Which of the following is a typical example of a transdermal agent?
• What is the practical difference between fraction absorbed and systemic bioavailability in pharmacokinetics?
• Which statement best describes how protein binding can affect the interpretation of a drug's blood concentration and its tissue targeting?
• How is drug distribution defined?
• What is the significance of the area under the curve (AUC) in pharmacokinetics?
• How is oral bioavailability calculated relative to an IV reference?
• How does lipophilicity influence the volume of distribution?
• How are drugs delivered subcutaneously able to reach systemic circulation?
• How does bile acid secretion influence the absorption of lipophilic drugs?
• Define absorption.
• If a drug is highly bound to plasma proteins, where is it primarily located?
• In dehydration, the volume of distribution typically decreases.
• If a drug is highly bound to plasma proteins, what is the expected free fraction?
• Where might P-glycoproteins be located in the body and why?
• In older adults, which change commonly increases the apparent Vd for lipophilic drugs?
• Which type of drugs might be absorbed better with a meal?
• In pharmacokinetic terms, how can changes in tissue perfusion affect distribution?
• What does apparent Vd tell you about a drug’s distribution in a patient?
• For protein-based drugs, which route is generally used to avoid digestion in the GI tract?
• Which statement is true about a drug with low volume of distribution (Vd)?
• Which option best captures the canonical sequence of pharmacokinetics?
• Which factor includes interactions with other drugs as a determinant of GI absorption?
• Which statement describes absorption from intramuscular injections?
• What features contribute to the Blood Brain Barrier's restrictive permeability?
• What are the main routes of drug administration?
• Rank the following routes from highest to lowest bioavailability: IV, IM, SQ, and oral.
• A weak acid at low pH will be in which form?
• In geriatric patients, would you expect the Vd to increase or decrease?
• If a drug is administered intramuscularly and the injection site has high vascularity, its absorption rate tends to be:
• Which patient factor most clearly increases the apparent volume of distribution for a lipophilic drug?
• Which statement is true about albumin binding and free drug fraction for acidic drugs?
• What can cause an apparent increase in half-life without changing the elimination rate constant?
• What gene codes for specific P-glycoproteins?
• How can protein binding lead to increased adverse drug-drug interactions?
• What is the preferred route of administration for protein based drugs?
• Which condition would increase a drug's Vd?
• Which pharmacokinetic parameter is primarily associated with the timing of the maximum plasma concentration after oral dosing?
• If a drug binds extensively to albumin, what happens to the free fraction and tissue distribution?
• Which parameter is most directly used to describe the rate of absorption after oral dosing?
• Would a drug with a high Vd be eliminated faster or slower than a drug with a low Vd, and why?
• Which properties most strongly predict a drug's ability to cross the blood-brain barrier?
• How can we measure drug absorption into circulation?
• How does inflammation influence the blood-brain barrier and CNS distribution of drugs?
• For a high-Vd drug, which tissue compartments are most likely to hold the majority of the drug?
• Which of the following is a common contributor to higher lipophilicity in drug molecules?
• Why would protein binding decrease a drug's distribution?
• Which statement best describes ion trapping?
• Which form is more permeable across membranes?
• Which factor can modify drug absorption besides dissolution/solubility and permeability?
• Which statement best describes the relationship between protein binding and drug action?
• What are the main factors affecting GI absorption of a drug?
• What does the rate of absorption into the bloodstream depend on in IM injections?
• Which component describes drug movement from the bloodstream into tissues?
• Regarding transdermal absorption, which statement is true?
• Which statement best describes the roles of uptake and efflux transporters in intestinal absorption?
• How are drugs given IM able to be absorbed into the bloodstream?
• Compared with passive diffusion, carrier-mediated transport is generally:
• What are some pros of giving a drug IV?
• In a two-compartment model, what does the alpha phase represent?
• How can food intake alter oral drug absorption?
• Which of the following best describes factors affecting GI absorption?
• Which routes bypass hepatic first-pass metabolism?
• What role do P-glycoprotein transporters play in drug distribution?
• What is a potential negative effect of protein binding on drugs?
• Given an oral dose of 20 mg/kg with 75% bioavailability, what rectal dose is required to achieve the same exposure if rectal bioavailability is 30%?
• Which membrane characteristic can influence paracellular diffusion?
• What is true about elimination and metabolism of bound drug?
• How does obesity affect the distribution of lipophilic drugs?
• Which route bypasses first-pass metabolism most effectively?
• What determines placental transfer of drugs?
• How can age affect drug distribution?
• How does plasma protein binding influence a drug's apparent volume of distribution?
• Are NSAIDs weak acids or weak bases?
• What would a large Vd indicate about a drug's distribution?
• Which of the following illustrates how drug interactions at protein binding can affect distribution?
• Compared with intravenous administration, transdermal delivery typically has which characteristics?
• Which factor affects GI absorption by influencing the drug's ability to cross membranes and is related to its chemical state?
• Define bioavailability.
• Which antibiotic demonstrates reduced absorption when taken with dairy products?
• Which mechanism is primarily responsible for drugs crossing cell membranes by dissolving in lipid bilayer?
• Which statement best distinguishes facilitated diffusion from active transport?
• For orally administered drugs, must they be absorbed and distributed to exert an effect?
• For small, lipophilic, non-ionized molecules, how does placental transfer occur?
• Absorption by carrier-mediated transport is broken down into which two forms?
• Why is ionization critical for absorption and distribution predictions?
• Absorption is defined as movement of a drug into the bloodstream.
• Why is a drug's ionization state important for its ability to cross biological membranes?
• Which form does a weak base tend to occupy in a more basic environment?
• What is the difference between absorption rate constant (ka) and elimination rate constant (ke)?
• What does absorption refer to in pharmacokinetics?
• What kinds of compounds are more likely to pass through cells via passive paracellular diffusion?
• Which pharmacokinetic parameter describes the total drug exposure over time?
• Why might a clinician select a sublingual route for a drug with poor oral bioavailability?
• Renal impairment can indirectly influence drug distribution by affecting which of the following?
• What can cause decreased distribution of a drug to tissue?
• What are the four main concepts of pharmacokinetics?
• Why is a loading dose used for drugs with a large apparent volume of distribution (Vd)?
• Which of the following would decrease drug absorption?
• Which statement best describes a low volume of distribution (Vd)?
• Differentiate between central and peripheral compartments in pharmacokinetic models.
• Which factors can cause a drug's Vd to vary between patients?
• Which statement correctly distinguishes dissolution-limited absorption from permeation-limited absorption?
• Geriatric patients often have what change that affects Vd?
• How is the Henderson-Hasselbalch equation used to predict drug ionization?
• Which statement describes elimination of drugs via the kidneys?
• Do all drugs have the same affinity for protein binding?
• When would we be more likely to give a drug IM vs SQ?
• Which environment favors the absorption of a weak acid?
• When on the concentration-time graph would we redose a transdermal drug?
• What is an example of a type of cell membrane protein that acts to pump drugs out of cells (efflux through carrier-mediated mechanisms)?
• If a drug has a very large Vd, into which compartments is it likely distributed?
• For anesthetics, a higher partition coefficient indicates what about potency?
• How are transdermal drugs absorbed?
• What is the value of oral bioavailability F when the reference administration is intravenous?
• There is a lag when a transdermal drug is used. Which statement best describes this for transdermal delivery?
• What is first-pass metabolism and how does it affect oral drug bioavailability?
• What is the bioavailability of an IV drug?
• Which value represents 100% bioavailability?
• What is meant by dissolution-limited absorption?
• How does transdermal delivery affect drug distribution and onset compared with oral dosing?
• In the context of meals, which statement about lipophilic drugs is true?
• Enterohepatic circulation can prolong a drug's presence in the body by which mechanism?
• How can pregnancy alter drug distribution?
• Is the total dose of the drug the most important factor in its effectiveness?
• What is meant by permeation-limited absorption?
• What is a typical clinical consequence of a drug crossing the placenta?
• Alpha-1-acid glycoprotein (AAG) interacts with basic drugs by binding; what is the general consequence for free fraction and distribution?
• Which statement about volume of distribution is true?
• How can hypoalbuminemia affect dosing of highly protein-bound drugs?
• Which factor is NOT listed as affecting GI absorption?
• Which type of drugs are often heavily bound to proteins like albumin?
• The bioavailability of a non-intravenous drug depends on what?
• Which route is specifically associated with injections beneath the skin?
• Which factors primarily govern the rate and extent of oral drug absorption?
• How are transdermal drugs normally designed?
• Which statement about the central compartment is accurate?
• An oral dose of 40 mg/kg with 80% bioavailability is compared to rectal bioavailability of 25%. What rectal dose is needed to match exposure?
• Why is there a lag at the beginning of the concentration-time curve for a transdermal drug?
• The bioavailability of a non-intravenous drug is typically:
• Which statement describes the effect of a large apparent Vd on half-life?
• Which of the following is a main factor affecting GI absorption?
• Which factor can alter a drug's solubility due to formulation?
• What determines whether a drug is ionized or un-ionized?
• What drug class is notorious for protein binding–mediated drug-drug interactions?
• What does the plateau at the top of a steady absorption-elimination curve represent?
• Which statement about protein binding and pharmacokinetics is true?
• What barrier prevents many drugs from reaching the brain?
• Paracellular transport is primarily associated with the movement of which type of molecules?
• In transdermal administration, how are drug levels in the body maintained?
• Which medication coats the stomach and can decrease absorption of other oral medications given afterward?
• If a drug is displaced from albumin, what immediate effect is most likely?
• How can disease states that alter tissue perfusion affect distribution kinetics?
• Which route is described as the preferred administration route for protein-based drugs?
• What is the relationship between AUC and clearance?
• In the context of renal impairment, which statement best describes changes that can alter drug distribution?
• If you were trying to move a substance against its concentration what kind of transport would you need?
• Why is it commonly stated that only the unbound drug distributes to tissues?
• Define bioavailability and how it differs from the rate of absorption.
• What else is the MDR-1 gene associated with in veterinary medicine?
• Active transport in carrier-mediated absorption requires which energy source?
• Which route has the lowest bioavailability?
• What are the primary determinants of a drug's volume of distribution (Vd)?
• Which statement best explains why most drugs do not cross the Blood Brain Barrier?
• Which capillary type is characteristic of the brain's microvasculature under the Blood Brain Barrier?
• Which statement best describes the binding of drugs to albumin and alpha-1-acid glycoprotein and its effect on distribution?
• Which CNS barriers are primarily involved in drug distribution to the brain?
• What role can the MDR-1 gene have in antibiotic treatment or cancer therapy?
• Why can't protein-based drugs like insulin be taken orally?
• Which factor describes the health and integrity of the GI lining affecting absorption?
• Which statement describes a drug that is not absorbed but still has a local effect in the GI tract?
• Which chemical structures make drugs more lipophilic?
• Besides the kidneys, which excretion route is noted for drug elimination?