HY USMLE Q #803 – Pharmacology

A 54-year-old man is brought to emergency by his wife after being found in the yard with labored respirations. Physical examination shows diaphoresis and excessive lacrimation and salivation. He has fecal and urinary incontinence. An initial pharmacologic agent is administered. Which of the following is the most likely second pharmacologic therapy initiated and its mechanism of action?

  Atropine; agonist
  Atropine; antagonist
  Atropine; cholinesterase regenerator
  Pralidoxime; agonist
  Pralidoxime, antagonist
  Pralidoxime; cholinesterase regenerator
  Pyridostigmine; agonist
  Pyridostigmine; antagonist
  Pyridostigmine; cholinesterase regenerator