RDA Dental Pharmacology and Pain Management

Question 1

A patient reports taking warfarin (Coumadin). Which concern is most relevant to the dental team before any invasive procedure?

Accepted Answer

The patient has an elevated risk of prolonged bleeding due to anticoagulation

Answer

Warfarin is an anticoagulant that inhibits vitamin K-dependent clotting factors, increasing bleeding time. Before invasive procedures, the dental team must know the patient's INR (International Normalized Ratio). Stopping warfarin without medical consultation can expose patients to dangerous thrombotic events, so the prescribing physician must be consulted.

Question 2

Epinephrine is added to local anesthetic cartridges primarily to:

Accepted Answer

Cause vasoconstriction, which prolongs anesthetic duration and reduces systemic absorption

Answer

Epinephrine is a vasoconstrictor that constricts local blood vessels, keeping the anesthetic in the injection site longer and slowing its absorption into the bloodstream. This prolongs the duration of anesthesia, deepens the block, and reduces the risk of systemic toxicity from rapid absorption.

Question 3

Amoxicillin is the first-line antibiotic for dental infection prophylaxis in eligible patients with cardiac conditions. For a patient who is allergic to penicillin, which antibiotic is the standard alternative?

Accepted Answer

Clindamycin

Answer

Per American Heart Association guidelines, clindamycin is the recommended alternative for infective endocarditis prophylaxis in patients unable to take penicillin/amoxicillin due to allergy. Metronidazole targets anaerobes and protozoa but is not the AHA-recommended prophylaxis alternative. Ciprofloxacin and tetracycline are not indicated for this purpose.

Question 4

A patient who takes an SSRI antidepressant asks if they can take ibuprofen for post-operative pain. The dental assistant should advise them to:

Accepted Answer

Consult the prescribing physician, as SSRIs combined with NSAIDs increase the risk of gastrointestinal bleeding

Answer

SSRIs inhibit platelet serotonin uptake, impairing platelet aggregation. When combined with NSAIDs like ibuprofen (which also inhibit platelet function and damage the gastric mucosa), the risk of GI bleeding increases significantly. Patients should be directed to consult their prescribing physician before combining these medications.

Question 5

Which category of drugs can cause gingival hyperplasia (overgrowth of gum tissue) as a side effect, requiring close attention during periodontal assessment?

Accepted Answer

Calcium channel blockers (e.g., nifedipine)

Answer

Calcium channel blockers—particularly nifedipine (used for hypertension and angina)—are well-known to cause drug-induced gingival hyperplasia in some patients. Other drugs with this side effect include phenytoin (seizure medication) and cyclosporine (immunosuppressant). The dental team must document all current medications at every appointment.

(RDA) Registered Dental Assistant Practice Test

(RDA) Registered Dental Assistant Practice Test

RDA Dental Pharmacology and Pain Management