The PMNP is evaluating a patient who is being treated for obsessive compulsive disorder with fluoxetine 60 mg daily. The patient has been on fluoxetine for months without any concerning adverse effects, but today the patient reports that for the past few weeks she has had a distinct sense of agitation, racing heart, nausea, and has been really clumsy. Suspecting serotonin syndrome, the NP assess for: 

A. New onset delusional thought 

B. Constipation 

C. Irritability 

D. Recent use of OTC cough medicine

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