Ocular Pharm Flashcards
Solubility for Tear Lipid Layer
lipid soluble
Solubility for Tear Aqueous Layer
water soluble
Solubility for Tear Mucous Layer
lipid and water soluble
Solubility for Corneal Epithelium and Endothelium
lipid soluble (lipophilic/ hydrophobic)
Solubility for Corneal Stroma
water soluble (hydrophilic/ lipophobic)
Best drugs to penetrate cornea
small, uncharged, lipid soluble
weak bases
Receptor on Iris Sphincter
M3
Receptor on Ciliary Muscle
M2, M3
B2
Receptor on Lacrimal Gland
M2, M3
Receptor on Iris Dilator
a1
Receptor on Trabecular Meshwork
B2
Receptor on NPCE
B2, B1
Receptor on CB vasculature
a2
Pilocarpine MOA
cholinergic agonist
CM pulls on SS to open TM- increase outflow
Pilocarpine SE
browache, headache myopic shift- lens moves forward
RD
miosis
angle closure glaucoma- pupillary block
Pilocarpine Use
LPI
1% for 3rd nerve palsy (will constrict)
0.125% for Adie’s (will constrict)
Edrophonium Use
Diagnose MG
aka Tensilon Test
Edrophonium MOA
anticholinesterase inhibitor - indirect cholinergic agonist
Neostigmine Use
MG treatment
Neostigmine MOA
anticholinesterase inhibitor - indirect cholinergic agonist
Echothiophate Use
diagnosis and treatment of accommodative esotropia and rarely glaucoma
Echothiophate MOA
anticholinesterase inhibitor - indirect cholinergic agonist
Pyridostigmine Use
MG treatment
Pyridostigmine MOA
anticholinesterase inhibitor - indirect cholinergic agonist
Examples of Cholinergic Antagonists
Atropine Scopolamine Homatropine Cyclopentolate Tropicamide (Also order of potency)
Scopolamine Use
patch for motion sickness
Scopolamine MOA
blocks Ach
Scopolamine SE
CNS toxicity- penetrates BBB
Cholinergic Agonist with fastest onset and shortest duration of mydriasis
Tropicamide
Max effect time of Tropicamide
25 min
Duration of Tropicamide
4-6 hours
SE of Tropicamide
SAFE AF
Tropicamide MOA
block Ach
Atropine MOA
blocks Ach
Atropine onset and duration
onset- 60-180 min
duration- 7-12 days of cyclo
Atropine Use
amplyopia penalization
uveitis
Atropine contraindications
no with Down’s and elderly
Cholinergic Antagonist with fastest onset and shortest duration of cycloplegia
cyclopentolate
Time of Max Effect of Cyclopentolate
45 min
Cyclopentolate Use
cycloplegic refractions
uveitis
Cyclopentolate MOA
blocks Ach
Homatropine Use
primary for anterior uveitis- keeps iris mobile
reduces pain by paralyzing ciliary and sphincter muscles
constricts iris and CB vasculature to seal BBB
Homatropine MOA
blocks Ach
Cholinergic Antagonist Toxicity
Symp effects
hot as a hare, red as a beet, dry as a bone, mad as a hatter, blind as a bat
Botulina Toxin MOA
blocks release of Ach at neuromuscular junction- stops muscle contraction
Botulina Toxin Use
blepharospasm
strabismus
Phenylephrine MOA
Adrenergic agonist- a1
Phenylephrine Use
dilation without cycloplegia- does not give fixed dilated pupil
gives 2.5mm lid lift from activating Muller’s Muscle
differentiate scleritis from episcleritis
Dose of Phenylephrine to break posterior synechiae
10%
Dose of Phenylephrine for diagnosing Horner’s Syndrome
1%
Contraindications for Phenylephrine
MOAI
TCAs
atropine
Grave’s Disease
Phenylephrine SE
cardiovascular effects- hypertensive crisis, cardiac arryhthmias
Naphzoline
Tetrahydrazoline (Visine)
MOA
adrenergic agonist- more a than B
constricts conjunctival blood vessels
Naphzoline
Tetrahydrazoline (Visine)
SE
depress CNS
fixed dilated pupil (a1)
Brimonidine (Alphagan) MOA
adrenergic agonist- a2
lowers IOP by increasing uveoscleral outflow and constricting CB vessels- less aqueous production
miosis to reduce glare postop LASIK/ PRK
Added anti-glaucoma benefit of Brimonidine (Alphagan)
neuroprotective properties
Brimonidine (Alphagan) SE
follicular conjunctivitis (not likely in Alphagan P) (.1%) dry mouth
Dosing Brimonidine (Alphagan)
TID
Brimonidine (Alphagan) Contraindications
MAOI
Apraclonidine MOA
adrenergic agonist- a2 and some a1
lowers IOP by increasing uveoscleral outflow and constricting CB vessels- less aqueous production
diagnosing Horner’s Syndrome