Adrenergic Antagonists Flashcards
What are the 5 beta-adrenergic antagonists?
Timolol Cartelol Betaxolol Levobunolol Metipranolol
What is the typical MOA of beta-adrenergic antagonists?
Decrease aqueous production by blocking the beta receptors of the non-pigmented ciliary epithelium
Is Timolol a selective or non selective beta blocker?
Non-selective
Which of the beta adrenergic antagonists is the most effective at lowering IOP?
Timolol
What is the typical dosing of Timolol?
0.25-0.50%
BID
When is the best time for Timolol to be dosed?
Morning - better daytime efficacy
What are the 2 “discouraging” factors of beta adrenergic antagonists?
Long term drift
Short term escape
Why should beta blockers be used with caution in diabetics?
They mask the symptoms of hypoglycemia
What may occur if beta blockers are given to a myasthenia gravis patient?
Weakness may be exacerbated
Cosopt is a combo therapy that combines what drugs?
Timolol (beta- blocker)
Dorzolamide (CAI)
Combigan is a combo therapy that combines what drugs?
Timolol (beta blocker)
Brimonidine (alpha2 agonist)
Which of the beta adrenergic antagonists is beta 1 selective?
Betaxolol
What are the 2 reasons that Carteolol might be preferred over Timolol, even though it doesn’t reduce IOP as well?
Reduced nocturnal bradycardia
Less stinging
Which of the 5 beta adrenergic antagonists has the fewest side effects?
Cartelol
What is the typical percentage of Betaxolol?
0.25%
The beta 1 activity of betaxolol can worsen what condition?
Congestive heart failure
Which of the beta adrenergic antagonists is most similar to Timolol?
Levobunolol
Which of the beta adrenergic antagonists is not used anymore?
Metipranolol
How do cholinergic agonists reduce IOP?
Increase corneoscleral outflow
How do alpha-adrenergic agonists decrease IOP?
Decrease production
Increase uveoscleral outflow
How do beta blockers reduce IOP?
Decrease production
How do CAIs decrease IOP?
Decrease production
How do PGAs decrease IOP?
Increase uveoscleral outflow
Which of the glaucoma drugs work on both production and outflow?
Alpha-adrenergic agonists