CCAP Pharmacology Fundamentals 2 — Questions and Answers
Question 1: Which pharmacokinetic process describes how essential oil constituents are absorbed through the skin into systemic circulation?
- Biotransformation
- Transdermal absorption (Correct answer)
- First-pass metabolism
- Renal excretion
Correct answer: Transdermal absorption
Transdermal absorption is the process by which lipophilic essential oil molecules penetrate the skin barrier and enter the bloodstream.
Question 2: The cytochrome P450 enzyme system is most relevant to aromatherapy because it is responsible for:
- Synthesizing essential oils in plants
- Metabolizing essential oil constituents in the liver (Correct answer)
- Transporting oils via carrier proteins in blood
- Filtering oils through the renal glomerulus
Correct answer: Metabolizing essential oil constituents in the liver
The hepatic CYP450 system metabolizes essential oil constituents, which can lead to potential drug interactions when enzymes are induced or inhibited.
Question 3: A client taking warfarin asks about using clove essential oil topically. The primary pharmacological concern is that eugenol may:
- Enhance warfarin's anticoagulant effect by inhibiting platelet aggregation (Correct answer)
- Decrease warfarin absorption from the GI tract
- Accelerate warfarin clearance via enzyme induction
- Bind to warfarin in plasma, inactivating it
Correct answer: Enhance warfarin's anticoagulant effect by inhibiting platelet aggregation
Eugenol in clove oil has antiplatelet properties that can potentiate the anticoagulant effects of warfarin, increasing bleeding risk.
Question 4: What does the term 'bioavailability' mean in the context of essential oil administration?
- The purity percentage of an essential oil
- The fraction of administered compound that reaches systemic circulation unchanged (Correct answer)
- The rate at which an oil evaporates at body temperature
- The number of active constituents in an oil blend
Correct answer: The fraction of administered compound that reaches systemic circulation unchanged
Bioavailability refers to the proportion of an essential oil constituent that successfully reaches systemic circulation in an active form after administration.
Question 5: Which route of administration typically results in the highest bioavailability for essential oil constituents by bypassing first-pass metabolism?
- Oral ingestion in a capsule
- Inhalation via the olfactory route
- Rectal suppository administration
- Sublingual mucosal absorption (Correct answer)
Correct answer: Sublingual mucosal absorption
Sublingual absorption bypasses hepatic first-pass metabolism because venous drainage from under the tongue enters the superior vena cava directly, not the portal circulation.
Question 6: Monoterpene hydrocarbons like limonene are generally considered to have low toxicity largely because they:
- Are too large to cross cell membranes
- Undergo rapid metabolism and excretion with a short half-life (Correct answer)
- Bind irreversibly to plasma proteins
- Are eliminated unchanged through sweat
Correct answer: Undergo rapid metabolism and excretion with a short half-life
Monoterpenes are rapidly hydroxylated by liver enzymes and excreted in urine as glucuronide conjugates, limiting their accumulation and toxicity.
Question 7: The phenomenon where repeated exposure to an essential oil constituent leads to a progressively reduced pharmacological response is called:
- Sensitization
- Tachyphylaxis (Correct answer)
- Synergism
- Potentiation
Correct answer: Tachyphylaxis
Tachyphylaxis is the rapid decrease in response to a drug or substance after repeated administration, requiring higher doses to achieve the same effect.
CCAP Pharmacology Fundamentals 2
Which pharmacokinetic process describes how essential oil constituents are absorbed through the skin into systemic circulation?