A 34-year-old man suffers a seizure while in a shopping mall. Witnesses tell the paramedics that the individual lost consciousness and then had rapid contraction and relaxation of his extremities. He then awoke and was confused. What is the most likely diagnosis?

A 34-year-old man suffers a seizure while in a shopping mall. Witnesses tell the paramedics that the individual lost consciousness and then had rapid contraction and relaxation of his extremities. He then awoke and was confused. What is the most likely diagnosis?

A 34-year-old woman with multiple sclerosis presents with uncontrollable muscle spasms. The physician prescribes tizanidine to help control the spasms. Tizanidine's mechanism of action is most similar to which of the following drugs?

A 7-year-old boy is brought to the clinic by his mother for a well-child checkup. Physical exam is normal, and he is in no acute distress. A few months ago, he started taking atomoxetine for attention-deficit/hyperactivity disorder. His mother has been pleased with the results but has one complaint that the physician immediately recognizes as a common side effect of atomoxetine. Which of the following is most likely the mother's complaint?

A 65-year-old man develops new onset of symptoms of urinary incontinence and cogwheel muscle rigidity. Evaluation of bladder function reveals sphincter bradykinesia. He has begun on treatment with levodopa. Which of the following effects should the physician warn this patient of?

An 83-year-old woman with Parkinson's disease is currently being treated with carbidopa/levodopa, but her Parkinson's symptoms are worsening. She has normal liver function and no history of liver disease. Selegiline is added to her regimen. How does selegiline help in Parkinson's disease?