A 52-year-old woman with end-stage multiple sclerosis who is currently taking several medications including prednisone and neostigmine is seen by a new physician. After examination, the patient has begun on dalfampridine. What is the most likely mechanism of action for this medication?

A 52-year-old woman with end-stage multiple sclerosis who is currently taking several medications including prednisone and neostigmine is seen by a new physician. After examination, the patient has begun on dalfampridine. What is the most likely mechanism of action for this medication?

A 24-year-old male comes to the clinic complaining of vague abdominal pain, headaches, sweating, and unintentional weight loss. Urinalysis reveals elevated levels of catecholamine metabolites. Which of the following is a metabolite specific to the breakdown of epinephrine?

Five patients are seen by their primary care physician because of chronic anxiety. Benzodiazepines are being considered for each of the patients. Which of the following patients would be best suited for this medication?

A 48-year-old man with schizophrenia on thioridazine for 20 years develops bilateral facial and jaw movements and rhythmic motions of his tongue. Physical examination of the heart, lungs, and abdomen are unremarkable. What is the most likely aberration on a neurotransmitter level?

A 78-year-old man with a long history of seizure disorder controlled with phenytoin presents to his dentist for routine follow-up. Which of the following findings must the dentist be concerned about and evaluate for?