Ocular Pharmacology-I
Learning Objectives
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At the end of this class students shall have abasic understanding of :
?pharmacokinetics and pharmacodynamics of
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ocular drugs
?Ocular routes of drug administration
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?Topical antibiotic and cycloplegic agents2
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OverviewOverview of ocular anatomy & physiology
Pharmacodynamics and Pharmacokinetics of ocular therapeutic agents
Ocular Routes of Drug Administration
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Therapeutic & Diagnostic applications of Drugs in OphthalmologyOphthalmic Effects of Selected Vitamin Deficiencies & Zinc Deficiency
Systemic Agents with Ocular Side Effects
Conclusion
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3Anatomy of Eye
4
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Tear Film
5
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Pharmacodynamics
?It is the biological and therapeutic effect of the drug
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(mechanism of action)
?Most drugs act by binding to regulatory
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macromolecules, usually neurotransmitters orhormone receptors or enzymes
?If the drug is working at the receptor level, it can be
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agonist or antagonist
?If the drug is working at the enzyme level, it can be
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activator or inhibitor7
Pharmacokinetics
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?It is the absorption, distribution, metabolism, and
excretion of the drug
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?A drug can be delivered to ocular tissue as:? Locally:
? Eye drop
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? Ointment
? Periocular injection
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? Intraocular injection? Systemically:
? Orally
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? IV
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Pharmacokinetics of Ocular Drugs
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? Classical pharmacokinetic theory based on
systemically administered drugs does not fully
apply to all ophthalmic drugs
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?Topical route ? most commonly used9
Absorption
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Rate & extent of absorption of topically instilled drugs depends upon ?
"Drug penetration into the eye is approximately linearly related to its
concentration in the tear film."
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1. Time the drug remains in the cul-de-sac &
precorneal tear film
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2. Elimination by nasolacrimal drainage3. Drug binding to tear proteins
4. Drug metabolism by tear & tissue proteins
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5. Diffusion across cornea & conjunctiva
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Distribution
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Transcorneal absorption
Accumulation in aqueous humor
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Distribution to intraocular structures
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Trabecular meshwork pathway
Distribution to systemic circulation
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11Distribution
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?Melanin binding of certain drugs ?
- Eg:
1. Mydriatic effect of alpha adrenergic agonists
slower in onset - darkly pigmented irides compared to
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those with lightly pigmented irides2. Atropine's mydriatic effect ? long lasting in non-albino
rabbits than in albino rabbits
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3. Accumulation of chloroquine in retinal pigmentepithelium ? Bull's eye maculopathy
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Metabolism
?Enzymatic biotransformation of ocular drugs
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- significant?Esterases ? particular interest
Eg: Development of prodrugs for enhanced
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ocular permeability
1. Dipivefrin hydrochloride
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2. Latanoprost13
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Drug Delivery in EyesTopical
Periocular Intraocular
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Systemic
drop
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SubconjunctivalIntracameral
Oral
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ointment
Subtenon
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Intravitrealintravenous
gel
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Peribulbar
Intramuscular
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Soft contact lensRetrobulbar
Ocular Routes of Drug Administration
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Sr.N Route
Special Utility
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Limitations &o
Precautions
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1.
Topical
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--Convenient--Compliance
-- Economical
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--Corneal & conjunctival
--Relatively safe
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toxicity--Nasal mucosal toxicity
--Systemic side effects from
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nasolacrimal absorption
2.
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Subconjunctival, -Anterior segment-Local Toxicity
sub-Tenon's &
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infections
-Globe perforation
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Retrobulbar-Posterior uveitis
-Optic nerve trauma
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injections
-Cystoid Macular
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-Central retinal artery orEdema (CME)
vein occlusion
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3.
Intraocular
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Anterior segment-Corneal toxicity
Injections
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surgery or infections
-Relatively short duration of
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action4.
Intravitreal
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Immediate local effect Retinal toxicity
Injection
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16Factors influencing local drug penetration into ocular tissue
?Drug concentration and solubility:
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higher concentration -- better penetratione.g pilocarpine 1-4% but limited by reflex tearing
?Viscosity: addition of methylcellulose and polyvinyl
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alcohol increases drug penetration by increasing
contact time with cornea and altering corneal
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epithelium?Lipid solubility: higher lipid solubility- more
penetration
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Factors influencing local drug penetration into ocular tissue? Surfactants: preservatives alter cell membrane in cornea
and increase drug permeability e.g. benzylkonium and
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thiomersal
? pH: the normal tear pH is 7.4
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If drug pH is much different, this will cause reflex tearing? Drug tonicity: when an alkaloid drug is put in relatively
alkaloid medium, the proportion of the uncharged form
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will increase, thus more penetration
? Molecular weight and size
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18TOPICAL
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Drop (Gutta)- simplest and most convenientmainly for day time use
1 drop=50 microlitre
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Conjuctival sac capacity=7-13 micro liter
so, even 1 drop is more than enough
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Methodhold the skin below the lower eye lid
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pul it forward slightly
INSTILL 1 drop
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? measures to increase drop absorption:-wait 5-10 minutes between drops
-compress lacrimal sac
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-keep lids closed for 5 minutes after instil ation
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Ointments?Increase the contact time of ocular medication to ocular
surface, thus better effect
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?It has the disadvantage of
blurring vision
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?The drug has to be highly lipid soluble with some watersolubility to have maximum effect as ointment
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Peri-ocular injections?They reach behind iris-
lens diaphragm better
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than topical application?E.g. subconjunctival,
subtenon, peribulbar, or
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retrobulbar
?This route bypass the
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conjunctival and cornealepithelium which is good
for drugs with low lipid
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solubility (e.g. penicillins)
?Also steroids and local
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anesthetics can beapplied this way
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Periocular
Subconjunctival - To achieve higher concentration
Drugs which cannot penetrate cornea due to large
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size
Penetrate via sclera
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Subtenon--Ant. Subtenon? diseases anterior to the lensPost. Subtenon? disease posterior to the lens
Retrobulbar- Optic neuritis
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Papil itis
Posterior uveitis
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AnesthesiaPeribulbar-- anesthesia
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Intraocular injections
? Intracameral or intravitreal
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? E.g.? Intracameral acetylcholine
(miochol) during cataract
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surgery
? Intravitreal antibiotics in
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cases of endophthalmitis? Intravitreal steroids in
macular edema
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? Intravitreal Anti-VEGF for
DR
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23Sustained-release devices
?These are devices that
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deliver an adequate
supply of medication at a
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steady-state level?E.g.
?Ocusert delivering
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pilocarpine
?Timoptic XE delivering
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timolol?Ganciclovir sustained-
release intraocular
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device
?Collagen shields
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24Systemic drugs
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?Oral or IV?Factor influencing systemic drug penetration
into ocular tissue:
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?lipid solubility of the drug: more
penetration with high lipid solubility
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?Protein binding: more effect with lowprotein binding
?Ocular inflammation: more penetration
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with ocular inflammation
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Therapeutic applications ofDrugs in Ophthalmology
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Common ocular drugs?Antibacterials (antibiotics)
?Antivirals
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?Antifungals
?Mydriatics and cycloplegics
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?Antiglaucoma medications?Anti-inflammatory agents
Corticosteroids
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?Ocular Lubricants
NSAID's
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?Local anesthetics?Ocular diagnostic drugs
?Ocular Toxicology
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Topical Antibacterial Agents
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Commercially Available for OphthalmicUse
Azithromycin
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1% solution
H
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ConjunctivitisCiprofloxacin
0.3% solution;
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H
-Conjunctivitis
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hydrochloride0.3% ointment
D-RCD -Keratitis
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-Keratoconjunctivitis
-Corneal Ulcers
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-Blepharitis-Dacryocystitis
Erythromycin
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0.5% ointment
H
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-Superficial Ocular Infectionsinvolving cornea or conjunctiva
Gatifloxacin
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0.3% solution
H
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ConjunctivitisH- Hypersensitivity ; D-RCD ? Drug Related Corneal Deposits
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Topical Antibacterial Agents CommerciallyAvailable for Ophthalmic Use.....
Gentamicin
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0.3%
H
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Conjunctivitis, Keratitissulfate
solution
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Levofloxacin
0.5%
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HConjunctivitis
Levofloxacin
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1.5%
H
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Corneal UlcersMoxifloxacin
0.5%
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H
Conjunctivitis
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solutionOfloxacin
0.3%
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H
Conjunctivitis
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solutionCorneal Ulcers
Tobramycin
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0.3%
H
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External infections of the eyesulfate
solution
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0.3%
ointment
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29Antibacterials( antibiotics)
? Penicillins
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? Cephalosporins? Sulfonamides
? Tetracyclines
? Chloramphenicol
? Aminoglycosides
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? Fluoroquinolones? Vancomycin
? Macrolides
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Antibiotics? Used topically in prophylaxis
(pre and postoperatively) and
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treatment of ocular bacterial
infections.
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? Used orally for the treatmentof preseptal cellulitis
e.g. amoxycillin with
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clavulanate, cefaclor
? Used intravenously for the
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treatment of orbital cellulitise.g. gentamicin, cephalosporin,
vancomycin,
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? Can be injected intravitrally for
the treatment of
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endophthalmitis31
? Specific antibiotic for almost each organisms
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? Sulfonamides- Chlamydial infections like TRACHOMAINCLUSION CONJUNCTIVITIS
TOXOPLAMOSIS
Bacterial cell wall synthesis inhibitors-
Penicil in
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CephalosporinsI) First generation- Gram + cocci eg cephazoline
i ) Second generation --Gram ? ve and antistaphylococcal--
cefuroxime
i i) Third generation? Gram ?ve bacilli --ceftriaxones
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? Side effects- allergic reaction
neutropenia
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thrombocytopeniaAmino glycosides
Mainly against gram negative bacilli
Bacterial protein synthesis inhibitors
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Gentamycin- 0.3% eye dropsTobramycin- 0.3% eye drop
Neomycin-- 0.3-0.5% eye drops
Amikacin ----- 1% eye drops
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Tetracycline
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Inhibit protein synthesisactive against both gram+ and gram -ve, some
fungi and Chlamydia
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Chloramphenicol
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Broad spectrum ,bacteriostatic,gram+/gram-ve, Chlamydia
0.5% Eye drops, ointment
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Fluoroqinolones
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?Most frequently used topical broad spectrum
antibiotics
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?Ciprofloxacin ? 0.3% eye drops?Ofloxacin - 0.3% eye drops
?Moxifloxacin - 0.5 % eye drops
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?Levofloxacin and Besifloxacin eye drops
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Antibiotics? Trachoma can be treated by
topical and systemic
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tetracycline or erythromycin,
or systemic azithromycin.
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? Bacterial keratitis (bacterialcorneal ulcers) can be treated
by topical fortified
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cephalosporins,
aminoglycosides,
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vancomycin, orfluoroquinolones.
? Bacterial conjunctivitis is
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usually self limited but topical
erythromycin,
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aminoglycosides,fluoroquinolones, or
chloramphenicol can be used
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Dacryocystitis - Infection of the lacrimal
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sac
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Hordeolum/ Stye ? Infection of the meibomian, Zeisor Moll gland
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Conjunctivitis ? Inflammatory process of
the conjunctiva
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Blepharitis ? Bilateral inflammatory process of the
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eyelids40
Antiviral Agents for Ophthalmic Use
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GENERIC NAMEROUTE OF
OCULAR
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INDICATIONS FOR USE
ADMINISTRATION
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TOXICITYTrifluridine
Topical (1% solution) PK, H
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-Herpes simplex keratitis
- Keratoconjuctivitis
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AcyclovirOral (200 mg
-Herpes zoster
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capsules, 800 mg
ophthalmicus
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tablets)- Herpes simplex
Intravenous
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iridocyclitis
Valacyclovir
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Oral (500- & 1000-Herpes simplex keratitis
mg)
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-Herpes zoster
ophthalmicus
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FamciclovirOral (125-,250 mg
-Herpes simplex keratitis
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tablets)
-Herpes zoster
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ophthalmicus41
PK ? Punctate Keratopathy ; H - Hypersensitivity
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Antiviral Agents for Ophthalmic Use...
GENERIC NAME
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ROUTE OFOCULAR
INDICATIONS FOR
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ADMINISTRATION
TOXICITY
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USEFoscarnet
Intravenous
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-----
Cytomegalovirus
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IntravitrealRetinitis
Ganciclovir
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Intravenous, Oral
-----
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CytomegalovirusIntravitreal implant
Retinitis
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Valganciclovir
Oral
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-------Cytomegalovirus
Retinitis
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Cidofovir
Intravenous
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------Cytomegalovirus
Retinitis
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Antivirals
?Acyclovir- Most commonly used anti-viral
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3% ointment 5 times-10-14 days
800mg oral 5 times 10-14 days
Intravenous for Herpes zoster retinitis
Others
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IdoxuridineINDICATIONS
Vidarabine
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HZ keratitis
Cytarabine
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Viral uveitisTriflurothymidine
Gancyclovir
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43VIRAL DENTRITIC ULCER
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CMV Retinitis45
Antifungal Agents for Ophthalmic Use
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Drug
Method of Administration
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Indications for UseAmphotericin B
0.1-0.5% solution
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Yeast & fungal keratitis &
endophthalmitis
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0.8-1 mg Subconjunctival- Yeast & fungal endophthalmitis
5 microgram intravitreal
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- Yeast & fungal endophthalmitis
injection
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- Yeast & fungal endophthalmitisNatamycin
5% topical suspension
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-Yeast & fungal blepharitis
-Conjunctivitis ; keratitis
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FluconazoleTopical, Oral & Intravenous
Yeast keratitis & endophthalmitis
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Itraconazole
Topical ,Oral
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Yeast & fungal keratitis &endophthalmitis
Ketoconazole
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Oral
Yeast keratitis & endophthalmitis
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Miconazole1% topical solution
Yeast & fungal keratitis
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ANTIFUNGAL
INDICATIONS
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Fungal corneal ulcer
Fungal retinitis/ Endophthalmitis
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Commonly used drugs are? Polyenes
? damage cel membrane of susceptible fungi
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? e.g. amphotericin B, natamycin, nystatin
? side ef ect: nephrotoxicity
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? Imidazoles? increase fungal cel membrane permeability
? e.g. miconazole, ketoconazole,fluconazole
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? Flucytocine
? act by inhibiting DNA synthesis
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4748
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Mydriatics and cycloplegics
? Dilate the pupil, ciliary muscle paralysis
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? CLASSIFICATIONShort acting- Tropicamide (4-6 hours)
Intermediate- homatropine ( 24 hours)
Long acting- atropine (2 weeks)
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Indications
corneal ulcer
uveitis
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cycloplegic refraction49
SR. DRUG
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FORMULATIO INDICATIONS FOR USE OCULAR SIDE
NO.
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NEFFECTS
1
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Atropine
0.5%, 1% & 2% -Cycloplegia
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-Photosensitivitysolution; 1%
-Mydriasis
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-Blurred vision
ointment
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-Cycloplegic retinoscopy-Dilated fundoscopic
Exam
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2
Scopolamine 0.25% solution Cycloplegia
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Photosensitivity-Mydriasis
-Blurred vision
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3
Homatropine 2% & 5%
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CycloplegiaPhotosensitivity
solution
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-Mydriasis
-Blurred vision
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4Cyclopentolat 0.5% 1%
Cycloplegia
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Photosensitivity
e
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solution-Mydriasis
-Blurred vision
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5
Tropicamide
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0.5% & 1%Cycloplegia
Photosensitivity
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solution
-Mydriasis
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-Blurred vision50
Thank you
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