Pharmacology When a patient is already on atropine and i.v. administration of norepinephrine to him will lead to: A Decrease in heart rate B Increase in heart rate C Decrease in pupil size D Decrease in peripheral resistance 💡 Explanation When a patient is already on atropine and i.v. administration of norepinephrine to him will lead to: ✓ Correct Answer: A. Decrease in heart rate