Pharmacology Intravenous administration of norepinephrine in a patient already taking an effective dose of atropine will often: A Increase heart rate B Decrease total peripheral resistance C Decrease pupil size D Has no effect on cardiovascular system 💡 Explanation Intravenous administration of norepinephrine in a patient already taking an effective dose of atropine will often: ✓ Correct Answer: A. Increase heart rate