Regarding ketamine, which statement is true?

Regarding ketamine, which statement is true?

A 38-year-old woman presents to the ophthalmologist for a routine eye examination. She is given intraocular pilocarpine. She was supposed to be administered two drops in each to dilate the eyes for the examination. Unfortunately, the eyedrops were administered by a new technician who inadvertently administered 10 drops of pilocarpine in each eye. Which of the following agents should be immediately given to the patient?

A 73-year-old man presents to his primary care physician complaining of a weak stream and nocturia four times at night. He is very sensitive to the medication side effects and is reluctant to take medications for this reason. Physical examination reveals a mildly enlarged prostate. Treatment of this condition may involve the use of which of the following agents to minimize side effects?

A 59-year-old man with Parkinson's disease begins a course of bromocriptine in hopes of improving his significant symptoms of cogwheel rigidity and bradykinesia. After being on the medication for 6 months, a renal ultrasound is obtained that reveals bilateral hydronephrosis and elevation of his serum creatinine to 2.5 mg/dL. What is the most likely explanation for these findings?

A 7-year-old boy is brought to the emergency department by his parents after being stung by a bee. The parents say that he is allergic to bee stings, and the patient is having great difficulty breathing. Epinephrine is administered immediately. His symptoms improve as molecules of epinephrine bind to β\(_2\)-receptors in bronchial smooth muscle. Which of the following describes a feature of β\(_2\)-receptors?