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 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 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?

A 53-year-old man comes to clinic for depression. He has had decreased interest and a depressed mood for the past 6 months. He also smokes half a pack of cigarettes a day and thinks that if he could quit, that would help his mood as well. What is the most appropriate treatment for his depression and cessation of smoking?

A 45-year-old woman with chronic anxiety presents to her primary care physician for follow-up. She currently takes Librium 10 mg three times per day. Important warning considerations for use of this medication include which of the following?