A 32-Year-Old Man Comes to the Office Due to Erectile

A 32-year-old man comes to the office due to erectile dysfunction and decreased libido for the past month.  The patient has never experienced these symptoms before and finds them to be very upsetting.  He has no problems with urination.  The patient has a history of schizophrenia and was discharged from a psychiatric hospital 3 months ago on risperidone.  He has no current delusions, and his auditory hallucinations have decreased in frequency and intensity.  His thoughts are well organized.  Review of systems is negative except for a recent 3-kg (6.6-lb) weight gain.  Physical examination shows bilateral breast enlargement.  Which of the following is the most likely mechanism responsible for this patient's decreased libido?

A) Decreased dopamine activity in the mesolimbic pathway
B) Decreased dopamine activity in the nigrostriatal pathway
C) Decreased dopamine activity in the tuberoinfundibular pathway
D) Increased dopamine activity in the mesolimbic pathway
E) Increased dopamine activity in the nigrostriatal pathway
F) Increased dopamine activity in the tuberoinfundibular pathway

Correct Answer:

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