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Pharmacology of Ophthalmic Drugs

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Questions and Answers

What is the mode of action of hydroxyamphetamine in the sympathetic system?

Contracts the dilator muscle

Enhances release of NE from pre-synaptic vesicle (correct)

Blocks reuptake of NE

Relaxes the sphincter muscle

What is the purpose of using cocaine in diagnosing Horner's syndrome?

To test the direct cholinergic response

To localize the lesion

To put cocaine in one eye and compare to the other eye (correct)

To diagnose the presence of anisocoria

What is the effect of tropicamide on the sphincter muscle?

Contracts the dilator muscle

Has no effect on the sphincter muscle

Relaxes the sphincter muscle (correct)

Contracts the sphincter muscle

What is the difference between Paremyd and other mydriatics?

Full dilation will only occur with Paremyd Signup and view all the answers

What is the effect of ganglionic blockers on blood pressure?

Decreases blood pressure Signup and view all the answers

What is the mechanism of action of cocaine as an anesthetic?

Acts as a local anesthetic Signup and view all the answers

What is the primary goal of the drug that releases norepinephrine from pre-synaptic vesicles?

To block the reuptake of norepinephrine Signup and view all the answers

What is the effect of sympathetic system agonists on blood pressure?

It can cause tachyphylaxis and increases in blood pressure Signup and view all the answers

Which of the following is NOT a characteristic of Paremyd?

It is used to diagnose Horner's syndrome Signup and view all the answers

What is the primary mechanism of action of cocaine as an adrenergic agonist?

It blocks the reuptake of norepinephrine Signup and view all the answers

What is the difference between a direct and indirect adrenergic agonist?

A direct agonist stimulates the receptor directly, while an indirect agonist enhances the release of norepinephrine Signup and view all the answers

What is the effect of tropicamide on the sphincter muscle and dilator muscle?

It relaxes the sphincter muscle and contracts the dilator muscle Signup and view all the answers