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Test Bank Applied Pharmacology For The Dental Hygienist 6th Edition
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Test Bank for Applied Pharmacology For the Dental Hygienist 6th Edition
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Test Bank Applied Pharmacology For The Dental Hygienist 6th Edition
Chapter 02: Drug Action and Handling
Haveles: Applied Pharmacology for the Dental Hygienist, 8th 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
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. 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.
DIF: Recall REF: Introduction | p. 11 OBJ: 1 TOP: NBDHE, 6.0. Pharmacology
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 effecUtiveSdosNe (ETD50).
ANS: C
Efficacy is an expression of maximum intensity of effect or response that can be produced by a drug. 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).
DIF: Comprehension REF: Characterization of Drug Action (Efficacy) | p. 11 OBJ: 1 TOP: NBDHE, 6.0. Pharmacology
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
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. Both meperidine and morphine, for example, have the ability to treat severe pain, but approximately 100 mg of meperidine would be required to produce the same action as 10 mg of morphine. The dose of meperidine needed to produce pain relief is larger than that for morphine. Less potent drugs require higher doses to produce therapeutic effects whereas more potent drugs can reach toxic levels at lower doses.
DIF: Application REF: Characterization of Drug Action (Potency) | p. 11 OBJ: 1 TOP: NBDHE, 6.0. Pharmacology
4. Which of the following statements is true regarding the therapeutic index (TI) of a drug?
a. A drug with a large TI is more dangerous than a drug with a small TI.
b. The formula for TI is ED50/LD50.
c. ED50 is 50% of the effective clinical dose.
d. TI is the ratio of the median lethal dose to the median effective dose.
ANS: D
LD50 is the dose causing death in 50% of test animals and ED50 is the do...
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