Which of the following does not cause mydriasis?
Correct Answer: Pilocarpine
Description: Pilocarpine cause miosis, not mydriasis Sympathomimetic drugs cause contraction of dilator pupillae and thus result in active mydriasis whereas parasympathomimetic drugs contract sphincter pupillae leading to active miosis. Parasympatholytic drugs like atropine stop the action of ACh on sphincter pupillae resulting in passive mydriasis. Effect Mechanism Drug Group Responsible Examples Active mydriasis Contraction of dilator pupillae Sympathomimetic drugs Phenylephrine ,Cocaine, Amphetamines Passive mydriasis Relaxation of sphincter pupillae Anti-cholinergic drugs Atropine ,Homatropine, Tropicamide Cyclopentolate Active miosis Contraction of sphincter pupillae Cholinergic drugs Pilocarpine, Physostigmine Passive miosis Relaxation of dilator pupillae Anti-adrenergic drugs Clonidine
Category:
Pharmacology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now