A 23-year-old man with mild erectile dysfunction presents to his primary care physician. He has no other medical problems. He does have an anxiety disorder. Physical examination of the abdomen and genitalia are within normal limits. Which of the following is the best agent for treatment of this patient?

A 23-year-old man with mild erectile dysfunction presents to his primary care physician. He has no other medical problems. He does have an anxiety disorder. Physical examination of the abdomen and genitalia are within normal limits. Which of the following is the best agent for treatment of this patient?

A 37-year-old woman presents to the plastic surgery group for the second round of treatment to address her wrinkles. She complains that her right eyelid and forehead are 'too droopy' and has a persistent headache since her first Botox treatment 5 days ago. What is the mechanism of action for this treatment?

A researcher is creating a novel medication to act at M₁ receptors. This agent will likely have which of the following augmentative effects on target organs?

A group of teenage boys present to the emergency department after ingesting a plant they heard would make them high. One member of the group still had some plant parts in his pocket, which you use to identify deadly nightshade. They present with xerostomia, dry eyes, flushed skin, blurry vision, and tachycardia. Which substance is likely causing their symptoms?

A 45-year-old man with a history of depression presents to the emergency department with priapism. He has had an erection for the past 2 h, and it is extremely painful. He is given pseudoephedrine and the erection subsides. What medication is the most likely cause of his priapism?