Complete Test Bank: Applied Pharmacology for The Dental Hygienist 9th Edition | Haveles | All Chapters

Test Bank for Applied Pharmacology for The Dental Hygienist 9th Edition by Elena Bablenis Haveles

Chapter 02: Drug Action and Handling

Haveles: Applied Pharmacology for the Dental Hygienist, 7th Edition

MULTIPLE CHOICE

1.  A drug is defined as a biologically active substance that can modify:

a.  the environment.

b.  the pH of tissue.

c.  cellular function.

d.  immune response.

ANS:  C

Correct: A drug can modify cellular function. A general understanding of drug action allows 

the dental hygienist to make informed decisions regarding possible drug interactions or 

adverse reactions for the patient.

Incorrect choices: It is a concern that discarded drugs may be affecting the environment, but 

this is not the definition of a drug. Some drugs may have the capacity to modify body 

compartment pH; however, this is not the definition for a drug. Some drugs may have the 

capacity to modify the immune response, but this is not the definition of a drug.

REF:  Introduction | p. 11    OBJ:  2

2.  In comparing two drugs, the dose-response curve for the drug that is more efficacious would:

a.  be closer to the y axis.

b.  be farther from the y axis.

c.  have a greater curve height.

d.  have a higher median effective dose (ED50).

ANS:  C

Correct: Efficacy is an expression of maximum intensity of effect or response that can be 

produced by a drug.

Incorrect choices: The other choices refer to indicators of drug potency, not efficacy. The 

potency of a drug is a function of the amount of drug required to produce an effect. The 

potency of drug is shown by the location of that drug’s curve along the log-dose axis (x axis).

REF:  Characterization of Drug Action (Efficacy) | p. 12  OBJ:  1

3.  Administering a drug of greater potency is better because drugs of greater potency do not 

require as high a dose.

a.  Both parts of the statement are true.

b.  Both parts of the statement are false.

c.  The first part of the statement is true; the second part is false.

d.  The first part of the statement is false; the second part is true.

ANS:  D

Correct: The first part of the statement is false, the second part is true. The absolute potency of 

a drug is immaterial as long as the appropriate dose is administered. If equally efficacious, 

both drugs will produce the same effect.