1
ROSENTHAL PHARMACOTHERERAPEUTICS FOR ADVANCED
PRACTICE NURSE AND PHYSICIAN ASSISTANT EXAM LATEST
UPDATE 2025/2026
A group of nursing students asks a nurse to explain the blood-brain barrier. The
nurse would be correct to say that the blood-brain barrier:
a. prevents some potentially toxic substances from crossing into the central
nervous system.
b. causes infants to be less sensitive to CNS drugs and thus require larger doses.
c. allows only ionized or protein-bound drugs to cross into the central nervous
system.
d. prevents lipid-soluble drugs from entering the central nervous system.
ANS: A
The blood-brain barrier can prevent some drugs and some toxic substances from
entering the CNS. The blood-brain barrier in infants is not fully developed, so
infants are more sensitive to CNS drugs and often require lower doses. The blood-
brain barrier prevents highly ionized and protein- bound drugs from crossing into
the CNS and allows lipid-soluble drugs and those that can cross via specific
transport systems to enter.
Which monoamines act as neurotransmitters in the central nervous system?
Select all that apply.
a. Acetylcholine
b. Norepinephrine
c. Serotonin
, 2
d. Dopamine
e. Epinephrine
f. Histamine
ANS: B , C , D , E
Acetylcholine and histamines are not monoamines.
A patient asks a nurse to explain what drug tolerance means. The nurse responds
by telling the patient that when tolerance occurs, it means the patient:
a. has developed a psychological dependence on the drug.
b. may need increased amounts of the drug over time.
c. will cause an abstinence syndrome if the drug is discontinued abruptly.
d. will have increased sensitivity to drug side effects.
ANS: B
When tolerance develops, a dose increase may be needed, because a decreased
response may occur with prolonged use. Psychologic dependence involves
cravings for drug effects and does not define tolerance. Physical dependence
occurs when the drug becomes necessary for the brain to function "normally,"
meaning the patient should be weaned from the drug slowly to prevent an
abstinence syndrome. Patients may have a decreased sensitivity to drug side
effects over time as the brain adapts to the medication.
A nurse is teaching a group of students about how CNS drugs are developed.
Which statement
by a student indicates a need for further teaching?
, 3
a. "Central nervous system drug development relies on observations of their
effects on human behavior."
b. "Studies of new central nervous system drugs in healthy subjects can produce
paradoxical
effects."
c. "Our knowledge of the neurochemical and physiologic changes that underlie
mental illness
is incomplete."
d. "These drugs are developed based on scientific knowledge of CNS transmitters
and receptors."
ANS: D
The deficiencies in knowledge about how CNS transmitters and receptors work
make systematic development of CNS drugs difficult. Testing in healthy subjects
often leads either to no effect or to paradoxical effects. Medical knowledge of the
neurochemical and physiologic changes underlying mental illness is incomplete.
The development of CNS drugs depends less on knowledge of how the CNS
functions and how these drugs affect that process and more on how
administering one of these agents leads to changes in behavior.
A nurse is teaching a group of nursing students how the CNS adapts to
psychotherapeutic
medications. Which statement by a nursing student indicates a need for further
teaching?
a. "Adaptation can lead to tolerance of these drugs with prolonged use."
b. "Adaptation helps explain how physical dependence occurs."
c. "Adaptation often must occur before therapeutic effects develop."
d. "Adaptation results in an increased sensitivity to side effects over time."
, 4
ANS: D
With adaptation of the central nervous system to prolonged exposure to CNS
drugs, many adverse effects diminish and therapeutic effects remain. Adaptation
helps explain how tolerance and physical dependence occur, as the brain adapts
to the presence of the drug. Therapeutic effects can take several weeks to
manifest, because they appear to work by initiating adaptive changes in the brain.
A psychiatric nurse is teaching a patient about an antidepressant medication. The
nurse tells the patient that therapeutic effects may not occur for several weeks.
The nurse understands that this is likely the result of:
a. changes in the brain as a result of prolonged drug exposure.
b. direct actions of the drug on specific synaptic functions in the brain.
c. slowed drug absorption across the blood-brain barrier.
d. tolerance to exposure to the drug over time.
ANS: A
It is thought that beneficial responses to central nervous system (CNS) drugs are
delayed because they result from adaptive changes as the CNS modifies itself in
response to prolonged drug exposure, and that the responses are not the result
of the direct effects of the drugs on synaptic functions. The blood-brain barrier
prevents protein-bound and highly ionized drugs from crossing into the CNS, but
it does not slow the effects of drugs that can cross the barrier. Tolerance is a
decreased response to a drug after prolonged use.
Which are medical applications of central nervous system drugs? Select all that
apply.
a. Analgesia
ROSENTHAL PHARMACOTHERERAPEUTICS FOR ADVANCED
PRACTICE NURSE AND PHYSICIAN ASSISTANT EXAM LATEST
UPDATE 2025/2026
A group of nursing students asks a nurse to explain the blood-brain barrier. The
nurse would be correct to say that the blood-brain barrier:
a. prevents some potentially toxic substances from crossing into the central
nervous system.
b. causes infants to be less sensitive to CNS drugs and thus require larger doses.
c. allows only ionized or protein-bound drugs to cross into the central nervous
system.
d. prevents lipid-soluble drugs from entering the central nervous system.
ANS: A
The blood-brain barrier can prevent some drugs and some toxic substances from
entering the CNS. The blood-brain barrier in infants is not fully developed, so
infants are more sensitive to CNS drugs and often require lower doses. The blood-
brain barrier prevents highly ionized and protein- bound drugs from crossing into
the CNS and allows lipid-soluble drugs and those that can cross via specific
transport systems to enter.
Which monoamines act as neurotransmitters in the central nervous system?
Select all that apply.
a. Acetylcholine
b. Norepinephrine
c. Serotonin
, 2
d. Dopamine
e. Epinephrine
f. Histamine
ANS: B , C , D , E
Acetylcholine and histamines are not monoamines.
A patient asks a nurse to explain what drug tolerance means. The nurse responds
by telling the patient that when tolerance occurs, it means the patient:
a. has developed a psychological dependence on the drug.
b. may need increased amounts of the drug over time.
c. will cause an abstinence syndrome if the drug is discontinued abruptly.
d. will have increased sensitivity to drug side effects.
ANS: B
When tolerance develops, a dose increase may be needed, because a decreased
response may occur with prolonged use. Psychologic dependence involves
cravings for drug effects and does not define tolerance. Physical dependence
occurs when the drug becomes necessary for the brain to function "normally,"
meaning the patient should be weaned from the drug slowly to prevent an
abstinence syndrome. Patients may have a decreased sensitivity to drug side
effects over time as the brain adapts to the medication.
A nurse is teaching a group of students about how CNS drugs are developed.
Which statement
by a student indicates a need for further teaching?
, 3
a. "Central nervous system drug development relies on observations of their
effects on human behavior."
b. "Studies of new central nervous system drugs in healthy subjects can produce
paradoxical
effects."
c. "Our knowledge of the neurochemical and physiologic changes that underlie
mental illness
is incomplete."
d. "These drugs are developed based on scientific knowledge of CNS transmitters
and receptors."
ANS: D
The deficiencies in knowledge about how CNS transmitters and receptors work
make systematic development of CNS drugs difficult. Testing in healthy subjects
often leads either to no effect or to paradoxical effects. Medical knowledge of the
neurochemical and physiologic changes underlying mental illness is incomplete.
The development of CNS drugs depends less on knowledge of how the CNS
functions and how these drugs affect that process and more on how
administering one of these agents leads to changes in behavior.
A nurse is teaching a group of nursing students how the CNS adapts to
psychotherapeutic
medications. Which statement by a nursing student indicates a need for further
teaching?
a. "Adaptation can lead to tolerance of these drugs with prolonged use."
b. "Adaptation helps explain how physical dependence occurs."
c. "Adaptation often must occur before therapeutic effects develop."
d. "Adaptation results in an increased sensitivity to side effects over time."
, 4
ANS: D
With adaptation of the central nervous system to prolonged exposure to CNS
drugs, many adverse effects diminish and therapeutic effects remain. Adaptation
helps explain how tolerance and physical dependence occur, as the brain adapts
to the presence of the drug. Therapeutic effects can take several weeks to
manifest, because they appear to work by initiating adaptive changes in the brain.
A psychiatric nurse is teaching a patient about an antidepressant medication. The
nurse tells the patient that therapeutic effects may not occur for several weeks.
The nurse understands that this is likely the result of:
a. changes in the brain as a result of prolonged drug exposure.
b. direct actions of the drug on specific synaptic functions in the brain.
c. slowed drug absorption across the blood-brain barrier.
d. tolerance to exposure to the drug over time.
ANS: A
It is thought that beneficial responses to central nervous system (CNS) drugs are
delayed because they result from adaptive changes as the CNS modifies itself in
response to prolonged drug exposure, and that the responses are not the result
of the direct effects of the drugs on synaptic functions. The blood-brain barrier
prevents protein-bound and highly ionized drugs from crossing into the CNS, but
it does not slow the effects of drugs that can cross the barrier. Tolerance is a
decreased response to a drug after prolonged use.
Which are medical applications of central nervous system drugs? Select all that
apply.
a. Analgesia
