FPGEE MCQ Exam Flashcards

Which of the following equations accurately describes clearance for the majority of drugs?

Answer: All of the above

All three equations provided are valid ways to describe or calculate drug clearance (Cl). Cl = QxE relates clearance to organ blood flow and extraction ratio. Cl = 0.7VD/t1/2 connects clearance to the volume of distribution and half-life. Cl = Elimination rate/Cp defines clearance as the rate of drug elimination divided by its plasma concentration, representing the volume of plasma cleared of drug per unit time.

Which of the following indicates the abbreviation INN?

Answer: International Nonproprietary Names for Pharmaceutical Substances

INN stands for International Nonproprietary Names for Pharmaceutical Substances. These are unique, globally recognized generic names designated by the World Health Organization (WHO) for pharmaceutical substances. INNs facilitate clear communication and enhance safety in the prescribing and dispensing of medications worldwide.

Which of the following affects solubility the least?

Answer: Hydroxylation

Solubility, particularly aqueous solubility, is significantly increased by Phase II conjugation reactions such as sulfation, glutathione conjugation, and glucuronidation, which add large, polar groups to the drug molecule. Hydroxylation, a Phase I metabolic reaction, adds a hydroxyl group, which does increase polarity and can improve solubility, but typically to a lesser extent than the bulkier and more polar conjugates formed during Phase II reactions.

What would be succinyl choline's preferred metabolic pathway?

Answer: Glucuronide conjugation

Glucuronide conjugation is a crucial Phase II metabolic pathway that significantly increases the water solubility of drugs and their metabolites by attaching a glucuronic acid molecule. This process makes compounds more polar and thus more readily excreted by the kidneys. While succinylcholine is primarily known for rapid hydrolysis by plasma pseudocholinesterase, glucuronide conjugation is a common and important pathway for the elimination of many drugs and their breakdown products, contributing to overall drug clearance.

Which of the enzymes listed below can metabolize ethanol?

Answer: All of the above

Ethanol metabolism involves multiple enzyme systems in the body. Alcohol dehydrogenase (ADH) is the primary enzyme responsible for converting ethanol to acetaldehyde. Cytochrome P450 enzymes, particularly CYP2E1, also play a role in ethanol metabolism, especially at higher concentrations. Additionally, glucuronyl transferase can conjugate ethanol metabolites or ethanol itself, contributing to its overall elimination.

Which of the following represents a tertiary literary example?

Answer: Trissel's

Tertiary literature sources provide summarized and evaluated information compiled from primary and secondary literature. Trissel's Handbook on Injectable Drugs is a classic example of tertiary literature, offering comprehensive data on the compatibility and stability of injectable medications. MEDLINE and Embase are secondary literature databases, while the Red Book primarily provides drug pricing information.

What influences the elimination rate more in highly polar medicines (like mannitol)?

Answer: Excretion rate

Highly polar medicines, such as mannitol, are poorly metabolized by the body and exhibit minimal reabsorption in the renal tubules. Due to their high water solubility, these drugs are primarily eliminated from the body unchanged via renal excretion. Therefore, the rate at which these drugs are excreted by the kidneys is the most significant factor influencing their overall elimination rate.