Nokea
The volume of distribution (Vd) for a drug that is completely retained in the vascular compartment would be?
- A. High
- B. Low
- C. Unchanged
- D. Cannot be determined
Correct Answer: B
Rationale: A drug confined to the vascular compartment (e.g., plasma) has a low Vd, close to plasma volume (about 0.06 L/kg), indicating limited distribution.
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Which statement accurately describes a drug agonist?
- A. A drug that reacts with specific receptor sites on a cell and prevents the reaction of another chemical with a different receptor site on that cell
- B. A drug that interferes with the enzyme systems that act as catalysts for different chemical reactions
- C. A drug that interacts directly with receptor sites to cause the same activity that a natural chemical would cause at that site
- D. A drug that reacts with receptor sites to block normal stimulation, producing no effect
Correct Answer: C
Rationale: Agonists are drugs that produce effects similar to those produced by naturally occurring neurotransmitters, hormones, or other substances found in the body. Noncompetitive antagonists are drugs that react with certain receptor sites, preventing the reaction of another chemical with a different receptor site. Drug-enzyme interactions interfere with the enzyme systems that stimulate various chemical reactions.
The patient is prescribed a medication that was just placed in Phase IV study. The patient tells the nurse, This medication is too expensive. Could the doctor order a generic form of this medication? What is the nurse's most accurate response?
- A. Medications are not produced in generic form until the patent expires, which normally takes several years.
- B. You can request the generic form but the binder used may make the drug less effective for this medication.
- C. The generic form of the medication would not be any less expensive because this is a relatively new medication.
- D. Generic medications are lower quality drugs and that would mean you would not be getting the best treatment available.
Correct Answer: A
Rationale: When a new drug enters the market, it is given a time-limited patent; generic forms of the medication cannot be produced until the patent expires. Because no generic version of this drug will exist because it is so new, it is impossible to predict what binder will be used or what the cost would be.
The typical response to intravenous injection of 5-HT in an anaesthetised animal is:
- A. Rise in BP
- B. Fall in BP
- C. Rise followed by brief fall in BP
- D. Sharp fall, followed by brief rise, followed by prolonged fall in BP
Correct Answer: D
Rationale: IV 5-HT (serotonin) typically causes a triphasic BP response in anesthetized animals: an initial sharp fall (vasodilation), a brief rise (vasoconstriction), and a prolonged fall (Bezold-Jarisch reflex).
The nurse is helping a client review a prescription from the health care provider. When examining the prescription, which of the following would the nurse expect to find documented?
- A. Name of the drug
- B. Dosage of the drug
- C. Route of drug administration
- D. All the above
Correct Answer: D
Rationale: The prescription must contain the client's name, the name of the drug, the dosage, the method and times of administration, and the signature of the licensed health care provider prescribing the drug.
The nurse is teaching a patient who has completed detoxification for alcohol abuse who will be discharged home with a prescription for disulfiram (Antabuse). Which statement by the patient indicates understanding of the teaching?
- A. Even topical products containing alcohol can have serious adverse effects while I am taking this drug
- B. If I experience drowsiness or skin rash, I should discontinue this drug immediately
- C. It is safe to take a product containing alcohol one week after the last dose of disulfiram
- D. This drug acts by blocking the pleasurable effects of alcohol
Correct Answer: A
Rationale: Disulfiram reacts with any alcohol, even topical; effects linger 2 weeks , and it causes aversion, not blocking pleasure . Disulfiram causes an unpleasant and potentially fatal reaction if alcohol is consumed while taking it and can even occur with topical products containing alcohol.