CDC Pharmacology & Drug Administration 3 — Questions and Answers
Question 1: A patient taking monoamine oxidase inhibitors (MAOIs) presents for dental treatment. Which vasopressor in local anesthetic solutions poses a serious interaction risk?
- Epinephrine (Correct answer)
- Acetylcholine
- Histamine
- Serotonin
Correct answer: Epinephrine
MAOIs can potentiate the cardiovascular effects of epinephrine, potentially causing hypertensive crisis.
Question 2: Which route of drug administration provides the fastest onset of action in dental emergencies?
- Intravenous (IV) (Correct answer)
- Oral
- Sublingual
- Intramuscular (IM)
Correct answer: Intravenous (IV)
Intravenous administration delivers drugs directly into the bloodstream, providing the fastest onset of action.
Question 3: Diphenhydramine (Benadryl) is classified as which drug type and has what relevance to dental pharmacology?
- Antihistamine; can cause sedation and is used for mild allergic reactions (Correct answer)
- NSAID; reduces dental pain and swelling
- Antibiotic; prevents post-procedural infection
- Corticosteroid; reduces inflammation
Correct answer: Antihistamine; can cause sedation and is used for mild allergic reactions
Diphenhydramine is a first-generation antihistamine used for mild allergic reactions; its sedative side effect is also clinically relevant in dentistry.
Question 4: Which benzodiazepine is most commonly used for oral pre-medication anxiolysis before dental procedures in the US?
- Triazolam (Correct answer)
- Diazepam
- Lorazepam
- Midazolam
Correct answer: Triazolam
Triazolam is widely used for oral premedication in dentistry due to its short half-life and effective anxiolytic properties.
Question 5: What does the term 'drug half-life' refer to in clinical pharmacology?
- Time for plasma concentration to decrease by 50% (Correct answer)
- Time for a drug to reach peak concentration
- Dose required to produce a therapeutic effect
- Duration of maximum drug effect
Correct answer: Time for plasma concentration to decrease by 50%
Half-life is the time it takes for the plasma concentration of a drug to fall by half, influencing dosing intervals.
Question 6: A ceramist lab assistant accidentally inhales methyl methacrylate (MMA) monomer fumes. What system is primarily at risk?
- Respiratory system (Correct answer)
- Cardiovascular system
- Renal system
- Musculoskeletal system
Correct answer: Respiratory system
MMA monomer fumes are respiratory irritants and can cause occupational asthma, airway irritation, and pulmonary sensitization.
Question 7: Which antidote is used to reverse benzodiazepine overdose in a dental emergency?
- Flumazenil (Correct answer)
- Naloxone
- Atropine
- Epinephrine
Correct answer: Flumazenil
Flumazenil is a competitive benzodiazepine receptor antagonist that rapidly reverses benzodiazepine-induced sedation.
CDC Pharmacology & Drug Administration 3
A patient taking monoamine oxidase inhibitors (MAOIs) presents for dental treatment.
Which vasopressor in local anesthetic solutions poses a serious interaction risk?