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Ординатура / Офтальмология / Английские материалы / Primary Care Ophthalmology_Palay, Krachmer_2005

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Therapeutic Medications

375

 

 

abnormalities and experience symptoms related to “dry eyes” (burning, itching, reflex tearing, and foreign body sensation). Patients with ocular surface abnormalities usually respond well to the “artificial tears” type of lubricant, although the symptomatic relief may be only temporary.

Restasis (cyclosporine 0.05% emulsion) is a newer agent for the topical treatment of severe dry eye associated with ocular inflammatory disorders.

Table 17–3 Artificial Tear Preparations

Generic Name

Trade Name

Preservative*

 

 

 

Carboxymethyl cellulose

Refresh Plus

None

 

Celluvisc

None

Hydroxyethyl cellulose

Comfort Tears

Benzalkonium chloride,

 

 

EDTA

Hydroxyethyl cellulose, polyvinyl

TearGard

Sorbic acid, EDTA

alcohol

 

 

Hydroxyethyl cellulose, povidone

Adsorbotear

Thimerosal, EDTA

Hydroxypropyl cellulose

Lacrisert

None

Hydroxypropyl methylcellulose

Isopto Plain

Benzalkonium chloride

 

Isopto Tears

Benzalkonium chloride

 

Tearisol

Benzalkonium chloride,

 

 

EDTA

 

Ultra Tears

Benzalkonium chloride

Hydroxypropyl methylcellulose,

Bion Tears

None

dextran 70

Tear Naturale II

Polyquad

 

Tears Naturale Free

None

 

Tears Renewed

Benzalkonium chloride,

 

 

EDTA

Polycarbophil, PEG-400, dextran 70

AquaSite

EDTA

 

AquaSite (multidose)

EDTA, ascorbic acid

Polyvinyl alcohol, PEG-400,

HypoTears

Benzalkonium chloride,

dextrose

 

EDTA

 

HypoTears PF

EDTA

Polyvinyl alcohol, povidone

Murine

Benzalkonium chloride,

 

 

EDTA

 

Refresh

None

 

Tears Plus

Chlorobutanol

 

 

 

*Preparations containing preservatives should be used no more than 6 to 8 times a day, to prevent toxicity to the ocular surface.

EDTA, ethylenediaminetetra-acetic acid.

Antibiotics

The most common ocular pathogens usually are staphylococci, streptococci, and Haemophilus species. Empirical treatment generally is successful in eradicating most surface infections; however, resistant organisms are becoming more common. Appropriate culture and susceptibility testing should be addressed before the initiation of therapy when clinically indicated.

376 CHAPTER 17 • Guide to Ophthalmic Medications

In general, topical antibiotics are given 4 to 6 times a day for simple infections and during the postoperative period. Severe infections, however, may require the use of multiple fortified antibiotics or an appropriate topical fluoroquinolone every hour around the clock.

Fortified Antibiotics. Used by ophthalmologists for serious anterior segment and corneal infections when higher concentrations of drug are needed to fight unusually virulent pathogens, fortified antibiotics are easily prepared by most pharmacies. The most common examples are fortified tobramycin or gentamicin, fortified vancomycin, and fortified cefazolin.

Table 17–4 Antibiotics

Generic Name

Trade Name

Bacterial Coverage

 

 

 

Bacitracin zinc

AK-Tracin

Most gram-positive organisms,

 

 

diphtheroids, Haemophilus, and

 

 

Actinomyces

Chloramphenicol

AK-Chlor

Many gram-positive and gram-negative

 

Chloramphenicol

organisms, especially Haemophilus,

 

(generic)

Moraxella species, Staphylococcus aureus,

 

Chloromycetin

beta-hemolytic streptococci, and

 

Chloroptic

diphtheroids

 

Ocu-Chlor

 

Ciprofloxacin

Ciloxan

Broad spectrum, particularly targeting

hydrochloride

 

staphylococci, streptococci, and

 

 

Pseudomonas aeruginosa

Erythromycin

AK-Mycin

Most gram-positive organisms,

 

Erythromycin (generic)

diphtheroids, Haemophilus, Actinomyces,

 

Ilotycin

and Neisseria species

Gatifloxacin

Zymar

Fourth-generation fluoroquinolone with

 

 

broader spectrum of coverage, but not

 

 

as good for Pseudomonas species

Gentamicin sulfate

Garamycin

Broad spectrum, particularly targeting

 

Genoptic

staphylococci (when drug used in high

 

Gentacidin

concentrations), and P. aeruginosa

 

Gentak

 

 

Gentamicin (generic)

 

Levofloxacin

Quixin

Broad spectrum, particularly targeting

 

 

staphylococci, streptococci, and

 

 

Haemophilus influenzae

Moxifloxacin

Vigamox

Fourth-generation fluoroquinolone with

 

 

broader spectrum of coverage, but not

 

 

as good for Pseudomonas species

Ofloxacin

Ocuflox

Broad spectrum, particularly targeting

 

 

staphylococci, streptococci, Haemophilus,

 

 

and P. aeruginosa

Polymyxin B/bacitracin

AK-Poly-Bac

Some gram-negative organisms and most

 

Polysporin

gram-positive organisms, diphtheroids,

 

 

Haemophilus, and Actinomyces

 

 

 

Therapeutic Medications

377

 

 

Table 17–4 Antibiotics—cont’d

Generic Name

Trade Name

Bacterial Coverage

 

 

 

Polymyxin B/

AK-Spore Neosporin

Gram-negative organisms and broad

neomycin/bacitracin

Neotal

spectrum for gram-positive organisms,

 

Polymyxin B (generic)

particularly targeting staphylococci,

 

 

pseudomonads, diphtheroids,

 

 

Haemophilus, and Actinomyces

Polymyxin B/

Terramycin

Most staphylococci, streptococci,

oxytetracycline

 

gonococci, Chlamydia species, and few

 

 

gram-negative organisms

Polymyxin B/

Polytrim

Most staphylococci, streptococci, and

trimethoprim

 

Haemophilus

Sulfacetamide sodium

AK-Sulf

Wide range of gram-positive and gram-

 

Bleph-10

negative organisms; some staphylococci,

 

Cetamide

pneumococci, Haemophilus, Moraxella

 

Isopto Cetamide

and Chlamydia species

 

Ophthacet

 

 

Sodium Sulamyd

 

 

Sulf-10

 

 

Sulfacetamide (generic)

 

Sulfisoxazole diolamine

Gantrisin

Wide range of gram-positive and gram-

 

 

negative organisms; some staphylococci,

 

 

pneumococci, Haemophilus, Moraxella

 

 

and Chlamydia species

Tobramycin sulfate

Defy

Broad spectrum, including staphylococci,

 

Tobrex

streptococci, Haemophilus, and

 

Tobramycin (generic)

P. aeruginosa

 

 

 

Table 17–5 Antibiotic Concentrations

 

 

Concentration of

Concentration of

Generic Name

Trade Name

Solution

Ointment

 

 

 

 

Bacitracin zinc

AK-Tracin

NA

50 units/g

Chloramphenicol

AK-Chlor

0.5%

1.0%

 

Chloromycetin

0.5%

1.0%

 

Chloroptic

0.5%

1.0%

 

Ocu-Chlor

0.5%

1.0%

Ciprofloxacin

Ciloxan

0.3%

0.3%

hydrochloride

 

 

 

Erythromycin

AK-Mycin

NA

0.5%

 

Erythromycin (generic)

NA

0.5%

 

Ilotycin

NA

0.5%

Gatifloxacin

Zymar

0.3%

NA

Gentamicin sulfate

Garamycin

0.3%

0.3%

 

Genoptic

0.3%

0.3%

 

Gentacidin

0.3%

0.3%

 

Gentak

0.3%

0.3%

 

Gentamicin (generic)

0.3%

0.3%

 

 

 

 

378 CHAPTER 17 • Guide to Ophthalmic Medications

Table 17–5 Antibiotic Concentrations—cont’d

 

 

Concentration of

Concentration of

Generic Name

Trade Name

Solution

Ointment

 

 

 

 

Levofloxacin

Quixin

0.5%

NA

Moxifloxacin

Vigamox

0.5%

NA

Ofloxacin

Ocuflox

0.3%

NA

Polymyxin B/bacitracin

AK-Poly-Bac

NA

10,000 units,

 

 

 

500 units/g

 

Polysporin

NA

10,000 units,

 

 

 

500 units/g

Polymyxin B/neomycin

Statrol

16,250 units,

10,000 units,

 

 

3.5 mg/mL

3.5 mg/g

Polymyxin B/neomycin/

Neotal

NA

5000 units, 5 mg,

bacitracin

 

 

400 units/g

 

Neosporin

NA

NA

 

Polymyxin B (generic)

NA

NA

Polymyxin B/neomycin/

AK-Spore

10,000 units in 1.75 mg

NA

gramicidin

Neosporin

NA

or 0.025 mg/mL

 

Polymyxin B (generic) }

NA

 

 

Polymyxin B/oxytetracycline

Terramycin

NA

10,000 units, 5 mg/g

Polymyxin B/trimethoprim

Polytrim

10,000 units, 1 mg/mL

NA

Sulfacetamide sodium

AK-Sulf

10.0%

10.0%

 

Bleph-10

10.0%

10.0%

 

Cetamide

NA

10.0%

 

Isopto Cetamide

15.0%

NA

 

Ophthacet

10.0%

NA

 

Sodium Sulamyd

10%, 30%

10.0%

 

Sulf-10

10.0%

NA

 

Sulfacetamide (generic)

10%, 15%, 30%

10.0%

Sulfisoxazole diolamine

Gantrisin

4.0%

4.0%

Tobramycin sulfate

Defy

0.3%

0.3%

 

Tobrex

0.3%

NA

 

Tobramycin (generic)

0.3%

0.3%

 

 

 

 

NA, not applicable.

 

 

 

Antivirals

Advances in the pharmacology of chemotherapeutic agents used to fight viral diseases have progressed rather slowly compared with those in other areas of medicine, in part because of the more complex mechanisms of viral infection that must be addressed in developing such agents. Viruses are obligate intracellular pathogens that use the host’s metabolic processes for their survival and replication. Thus, antiviral agents need to target the pathogen while leaving uninfected host cells essentially unaffected from their toxic side effects. To date, the most effective antiviral agents target viral enzymes and proteins that are essential for viral assembly.

Therapeutic Medications

379

 

 

Table 17–6 Antiviral Agents

Generic Name

Trade Name

Concentration

Indication

 

 

 

 

Idoxuridine

Herplex

0.1% solution

HSV infection

 

Stoxil

0.5% ointment

HSV infection

Trifluridine

Viroptic

1.0% solution

HSV infection

Vidarabine

Vira-A

3.0% ointment

HSV infection

monohydrate

 

 

 

Acyclovir sodium

Zovirax

Systemic preparation only

HSV, HZV infection

Foscarnet sodium

Foscavir

Systemic preparation only

CMV infection in immunocompromised

 

 

 

patients

Famciclovir

Famvir

Systemic preparation only

HZV infection

Ganciclovir sodium

Cytovene

Systemic preparation only

CMV infection in immunocompromised

 

Vitrasert

Intraocular implant

patients

 

 

Valacyclovir

Valtrex

Systemic preparation only

HSV, HZV infection

hydrochloride

 

 

 

 

 

 

 

CMV, cytomegalovirus; HSV, herpes simplex virus; HZV, herpes zoster virus.

Antifungal Agents

Deciding on the appropriate ophthalmic antifungal usually depends on several variables, including the site of primary infection, route of administration, organism involved, and drug sensitivities. Currently, Diflucan (fluconazole) and Sporanox (itraconazole) are oral/systemic agents that show good ocular penetration as an adjunct in these difficult to treat infections.

Table 17–7 Antifungal Agents

Generic Name

Trade Name

Topical Concentration

Spectrum

 

 

 

 

Amphotericin B

Amphotericin B

0.1-0.5% solution

Blastomycetes; Candida, Coccidioides, and

 

 

 

Histoplasma species

Flucytosine

Ancobon

1.0% solution

Candida species

Natamycin*

Natacyn

5% suspension

Candida species, aspergilli, and Cephalosporium,

 

 

 

Fusarium, and Penicillium species

Miconazole nitrate

Monistat

1% solution

Candida and Cryptococcus species, aspergilli

 

 

 

 

*Often the drug of choice for most mycotic corneal infections and the only ocular formulation commercially available. The others need to be prepared by the pharmacy.

380 CHAPTER 17 • Guide to Ophthalmic Medications

Anti-inflammatory Agents

Anti-inflammatory agents are used most frequently to suppress immunologic mechanisms of all types, both externally and within the eye. Suppression of severe external inflammation is necessary to prevent corneal scarring and permanent tear film abnormalities. Within the eye, these agents help prevent synechiae (scarring), some forms of glaucoma, and postoperative inflammation. Topical administration allows excellent penetration into the anterior chamber. Some agents penetrate easier (e.g., suspensions) than others depending on the chemical composition. Topical corticosteroids should be used with caution because they can cause cataracts and glaucoma used chronically and may acutely potentiate herpes simplex viral replication or microbial infection.

Table 17–8 Anti-inflammatory Agents

 

 

 

Topical

Generic Name

Trade Name

Formulation

Concentration

 

 

 

 

Dexamethasone

Maxidex

Suspension*

0.1%

Dexamethasone sodium

AK-Dex

Ointment

0.05%

phosphate

Decadron

Ointment

0.05%

 

Maxidex

Ointment

0.05%

 

Dexamethasone (generic)

Ointment

0.05%

Dexamethasone sodium

AK-Dex

Solution

0.1%

phosphate

Decadron

Solution

0.1%

 

Dexamethasone (generic)

Solution

0.1%

Fluorometholone

Fluor-OP

Suspension*

0.1%

 

FML

Suspension*

0.1%

 

FML Forte

Suspension*

0.25%

 

FML S.O.P.

Ointment

0.1%

Fluorometholone acetate

Flarex

Suspension*

0.1%

Loteprednol etabonate

Alrex

Suspension*

0.2%

 

Lotemax

Suspension*

0.5%

Medrysone

HMS

Suspension*

1.0%

Prednisolone acetate

Econopred

Suspension*

0.125%

 

Econopred Plus

Suspension*

1.0%

 

Pred-Forte

Suspension*

1.0%

 

Pred Mild

Suspension*

0.125%

Prednisolone sodium

AK-Pred

Solution

0.125%, 1.0%

phosphate

Inflamase

Solution

0.125%

 

Inflamase Forte

Solution

1.0%

 

Prednisolone (generic)

Solution

0.125%, 1.0%

Rimexolone

Vexol

Suspension*

1.0%

*Suspensions need to be shaken before instillation.

Therapeutic Medications

381

 

 

Anti-inflammatory and Antibiotic Combinations. Generally, anti-inflammatory medications are indicated for steroid-responsive inflammatory ocular conditions for which a corticosteroid is indicated and bacterial infection or risk of bacterial ocular infection exists. These medications may be contraindicated in any condition in which an epithelial defect exists, including patients with epithelial herpes simplex keratitis and those who have recently undergone uncomplicated removal of a corneal foreign body.

Table 17–9 Anti-inflammatory and Antibiotic Combinations

 

 

 

Formulation and

 

Generic Name

Trade Name

Amount

Typical Dosage

 

 

 

 

 

Gentamicin sulfate/

Pred-G

 

Suspension (5 mL)

1 drop 4 times a day

prednisolone acetate

 

 

Ointment (3.5 g)

Up to 4 times a day

Neomycin/polymyxin B/

Dexacidin

}

Suspension (5 mL)

1 drop 4 times a day

dexamethasone

Maxitrol

Ointment (3.5 g)

Up to 4 times a day

Neomycin/dexamethasone

NeoDecadron

Suspension (5 mL)

1 drop 4 times a day

 

 

 

Ointment (3.5 g)

Up to 4 times a day

Oxytetracycline/dexamethasone

Terra-Cortril

Suspension (5 mL)

1 drop 3 times a day

Sulfacetamide sodium/

AK-Cide

 

Suspension (5 mL)

1 drop 4 times a day

prednisolone acetate

VasocidinBlephamide }

Ointment (3.5 g)

Up to 4 times a day

Tobramycin/dexamethasone

Tobradex

 

Suspension (5 mL)

1 drop 4 times a day

 

 

 

Ointment (3.5 g)

Up to 4 times a day

 

 

 

 

 

Nonsteroidal Anti-inflammatory Agents. Nonsteroidal anti-inflammatory drugs (NSAIDs) also are used to suppress inflammatory mechanisms, both externally and within the eye. They differ from corticosteroids in their mechanisms of action and effectiveness; however, they do not cause cataracts or glaucoma or potentiate herpes simplex viral replication.

Table 17–10 Nonsteroidal Anti-inflammatory Agents

Generic Name

Trade Name

Formulation

Topical Concentration

 

 

 

 

Diclofenac

Voltaren

Solution

0.1%

Flurbiprofen

Ocufen

Solution

0.03%

Ketorolac

Acular

Solution

0.5%

Suprofen

Profenal

Solution

1.0%

 

 

 

 

382 CHAPTER 17 • Guide to Ophthalmic Medications

Table 17–11 Comparison of Selected Anti-inflammatory Agents

Generic Name

Trade Name

Comment

 

 

 

NSAIDs

Ocufen

Interference with prostaglandin-induced operative

 

Voltaren

miosis, other inflammations (e.g., iritis, cystoid

 

Acular

macular edema), and allergy-related irritation; no

 

 

causation of cataracts or glaucoma; no potentiation of

 

 

herpes simplex infection

Loteprednol

Alrex

Used for ocular surface allergy control

 

Lotemax

Higher strength, better for intraocular inflammation

 

 

Fewer side effects than with prednisolone and

 

 

dexamethasone

Medrysone

HMS

Weak steroid, useful for surface allergy, very few side

 

 

effects

Fluorometholone

FML

More potent than medrysone, excellent for external

 

 

inflammation, fewer side effects than with

 

 

prednisolone and dexamethasone

Prednisolone

Pred-Forte

Potent steroid, highly effective for anterior segment

acetate

 

inflammation, higher risk of side effects (IOP

 

 

elevation, infection, HSV activation)

Dexamethasone

Decadron

Highly potent and effective, very high risk of side

sodium

 

effects

phosphate

 

 

Rimexolone

Vexol

Potent steroid, with somewhat fewer ocular side effects

 

 

(similar to those with FML)

 

 

 

HSV, herpes simplex virus; IOP, intraocular pressure; NSAIDs, nonsteroidal anti-inflammatory drugs.

Antiglaucoma Medications

Antiglaucoma medications are used to reduce optic nerve damage and visual loss associated with elevated introcular pressure. The seven classes of these medications, which differ in their mechanisms of action, are as follows:

1.Beta-blocking agents (Table 17–12)

2.Adrenergic agonists (Table 17–13)

3.Cholinergic agonists (Table 17–14)

4.Sympathomimetics (Table 17–15)

5.Carbonic anhydrase inhibitors (Table 17–16)

6.Prostaglandins (Table 17–17)

7.Hyperosmotic agents (Table 17–18)

Beta Blockers. A class of drugs commonly used as first-line agents for treatment of open-angle glaucoma and ocular hypertension, beta blockers work mostly by reducing aqueous humor secretion by the ciliary body. Because of some systemic absorption, they may be contraindicated in some patients with heart and respiratory conditions. More selective beta blockers appear to have less severe side effects, but are not as efficacious. Ocular side effects include stinging and burning.

Therapeutic Medications

383

 

 

Table 17–12 Antiglaucoma Medications: Beta Blockers

Generic Name

Trade Name

Typical Dosage

Comments

 

 

 

 

Betaxolol hydrochloride

Betoptic-S (0.25%) 1 drop

Generic (0.5%) 1 drop

Beta-2 selective; use cautiously

 

2 times a day

2 times a day

in patients with respiratory

 

 

 

conditions

Carteolol hydrochloride

Ocupress (1.0%)

1 drop 2 times a day

Nonselective beta blocker

Levobunolol

Betagan (0.25%, 0.5%)

1 drop 2 times a day

Nonselective beta blocker

hydrochloride

Generic (0.25%, 0.5%)

1 drop 2 times a day

 

Metipranolol

Optipranolol (0.3%)

1 drop 2 times a day

Nonselective beta blocker

Timolol maleate

Timoptic (0.25%, 0.5%)

1 drop 2 times a day

Nonselective beta blocker

Timolol maleate

Timoptic XE (0.25%, 0.5%)

Once a day

Nonselective beta blocker;

 

 

 

solution becomes a gel

 

 

 

once in contact with the

 

 

 

eye, increasing period of

 

 

 

drug delivery

Timolol hemihydrate

Betimol (0.25%, 0.5%)

1 drop 2 times a day

Nonselective beta blocker

 

 

 

 

Alpha Agonists. Alpha agonists reduce intraocular pressure by decreasing aqueous production and increasing uveoscleral outflow. This class may prove to be effective at reducing intraocular pressure without the cardiac side effects of beta blockers. Currently, two drugs are on the market. The most common side effect is an allergic reaction developing with long-term use.

Table 17–13 Antiglaucoma Medications: Alpha Agonists

Generic Name

Trade Name

Typical Dosage

Comments

 

 

 

 

Apraclonidine

Iopidine (0.5%, 1%)

1 drop 3 times a day

Short-term adjuvant for patients on

 

 

 

maximal medical therapy; approximately

 

 

 

1 month to be effective

Brimonide tartrate

Alphagan-P (0.15%)

1 drop 3 times a day

Agent with seemingly better toleration

 

 

 

than its predecessor; less tachyphylaxis

 

 

 

noted

 

Generic (0.2%)

1 drop 3 times a day

High allergy incidence

 

 

 

 

Cholinergics. Parasympathomimetic agents are divided into direct-acting (cholinergic) and indirect-acting (anticholinesterase) agents. Used primarily for glaucoma and control of accommodative esotropia, they reduce intraocular pressure by causing contraction on the ciliary muscle. This contraction pulls on the trabecular meshwork and facilitates aqueous outflow. Acute poisoning with these agents (unusual with topical application) can produce the cholinergic crisis syndrome, which includes sweating, gastrointestinal disturbances, bradycardia, and paralysis of the respiratory muscles.

384 CHAPTER 17 • Guide to Ophthalmic Medications

Table 17–14 Antiglaucoma Medications: Cholinergic Agents

Generic Name

Trade Name

Typical Dosage

Concentrations

 

 

 

 

Cholinergic Agents

 

 

 

Carbachol

Isopto Carbachol

1 drop 3 times a day

1.5%, 3%

Pilocarpine

Akarpine

1 drop 4 times a day

1%, 2%, 4%

hydrochloride

Isopto Carpine

1 drop 4 times a day

0.5%, 1%-6%, 8%, 10%

 

Ocusert-Pilo

1 insert a week

20-40 mg/hr/week

 

Pilocar

1 drop 4 times a day

0.5%, 1%-4%, 6%

 

Pilopine HS Gel

1/2 inch at bedtime

4%

 

Piloptic

1 drop 4 times a day

0.5%, 1%-4%, 6%

 

Pilostat

1 drop 4 times a day

1%, 2%, 4%

 

Storzine

1 drop 4 times a day

1%, 2%, 4%

 

Generic

1 drop 4 times a day

0.5%, 1%-4%, 6%

Pilocarpine nitrate

Pilagan

1 drop 4 times a day

1%, 2%, 4%

Anticholinesterase Agents

 

 

 

Physostigmine

Eserine

1 drop 4 times a day

0.25%

 

Generic (ointment)

1/2 inch 3 times a day

0.25%

Demecarium

Humorsol

1 drop 2 times a day

0.125%, 0.25%

 

 

to 1 drop a week

 

Echothiophate iodide

Phospholine iodide

1 drop 2 times a day

0.125%, 0.25%

 

 

 

 

Sympathomimetics. Sympathomimetics have been of limited usefulness in the general population due to the numerous side effects (surface allergy, tolerance) associated with their use. However, a certain subset of the population tolerates these medications. These agents reduce intraocular pressure by mostly increasing aqueous outflow.

Table 17–15 Antiglaucoma Medications: Sympathomimetics

Generic Name

Trade Name

Typical Dosage

Concentration

 

 

 

 

Epinephrine bitartrate

Epitrate

1 drop every day or 2

2%

 

 

times a day

 

Epinephrine borate

Epinal

1 drop 2 times a day

0.5%, 1%

 

Eppy/n

1 drop 2 times a day

0.5%, 1%, 2%

Epinephrine hydrochloride

Epifrin

1 drop every day or 2

0.5%, 1%, 2%

 

Glaucon

times a day

1%, 2%

Dipivefrin hydrochloride

Propine

1 drop 2 times a day

0.10%

 

 

 

 

Carbonic Anhydrase Inhibitors. Carbonic anhydrase inhibitors (CAIs) reduce aqueous formation by direct inhibition of carbonic anhydrase within the ciliary body. Oral CAIs are highly effective but can also result in serious side effects such as paresthesias, anorexia, gastrointestinal disturbances, headaches, altered taste and smell, and sodium and potassium depletion. Kidney stone formation may be facilitated in certain patients. Topical CAIs appear to be much better tolerated, with a lower side-effect profile, but are not as effective.